add new classes and test cases

.gitignore

@@ -1,2 +1,3 @@
+out/
 build/
-.gradle/
+.gradle/

.idea/codeStyleSettings.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectCodeStyleSettingsManager">
+    <option name="PER_PROJECT_SETTINGS">
+      <value />
+    </option>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default (1)" />
+  </component>
+</project>

.idea/compiler.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel>
+      <module name="groovy-tools_main" target="1.8" />
+      <module name="groovy-tools_test" target="1.8" />
+    </bytecodeTargetLevel>
+  </component>
+</project>

.idea/gradle.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="LOCAL" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleHome" value="$USER_HOME$/Downloads/gradle-3.3" />
+        <option name="gradleJvm" value="#JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+        <option name="useAutoImport" value="true" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/libraries/Gradle__com_sun_mail_javax_mail_1_5_3.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="Gradle: com.sun.mail:javax.mail:1.5.3">
+    <CLASSES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.sun.mail/javax.mail/1.5.3/a6ab2437933757407082cb86aaeb655549296067/javax.mail-1.5.3.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.sun.mail/javax.mail/1.5.3/cce488a0fd790ac67ce658d66199ec9f5e194398/javax.mail-1.5.3-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Gradle__javax_activation_activation_1_1.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="Gradle: javax.activation:activation:1.1">
+    <CLASSES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/javax.activation/activation/1.1/e6cb541461c2834bdea3eb920f1884d1eb508b50/activation-1.1.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/javax.activation/activation/1.1/3697e9f67a2ed7ac5f589cff30f21173299440/activation-1.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Gradle__junit_junit_4_12.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="Gradle: junit:junit:4.12">
+    <CLASSES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/junit/junit/4.12/2973d150c0dc1fefe998f834810d68f278ea58ec/junit-4.12.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/junit/junit/4.12/a6c32b40bf3d76eca54e3c601e5d1470c86fcdfa/junit-4.12-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Gradle__org_codehaus_groovy_groovy_all_2_4_8.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="Gradle: org.codehaus.groovy:groovy-all:2.4.8">
+    <CLASSES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.codehaus.groovy/groovy-all/2.4.8/b2ddd0b4b2dd7598ccb769cc2eb37ff8d683e7c0/groovy-all-2.4.8.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.codehaus.groovy/groovy-all/2.4.8/c0b188118d0bbee615ee601c048b14c7772d7e41/groovy-all-2.4.8-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="Gradle: org.hamcrest:hamcrest-core:1.3">
+    <CLASSES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.hamcrest/hamcrest-core/1.3/42a25dc3219429f0e5d060061f71acb49bf010a0/hamcrest-core-1.3.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.hamcrest/hamcrest-core/1.3/1dc37250fbc78e23a65a67fbbaf71d2e9cbc3c0b/hamcrest-core-1.3-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Gradle__org_spockframework_spock_core_1_0_groovy_2_4.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="Gradle: org.spockframework:spock-core:1.0-groovy-2.4">
+    <CLASSES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.spockframework/spock-core/1.0-groovy-2.4/ceaa8b69f274ed3de24da3e6a6c86f673b426d1a/spock-core-1.0-groovy-2.4.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.spockframework/spock-core/1.0-groovy-2.4/db9597087c5e4afc2ef795c8ae89e32eddd019a6/spock-core-1.0-groovy-2.4-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/misc.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ClientPropertiesManager">
+    <properties class="javax.swing.AbstractButton">
+      <property name="hideActionText" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JComponent">
+      <property name="html.disable" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JEditorPane">
+      <property name="JEditorPane.w3cLengthUnits" class="java.lang.Boolean" />
+      <property name="JEditorPane.honorDisplayProperties" class="java.lang.Boolean" />
+      <property name="charset" class="java.lang.String" />
+    </properties>
+    <properties class="javax.swing.JList">
+      <property name="List.isFileList" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JPasswordField">
+      <property name="JPasswordField.cutCopyAllowed" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JSlider">
+      <property name="Slider.paintThumbArrowShape" class="java.lang.Boolean" />
+      <property name="JSlider.isFilled" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JTable">
+      <property name="Table.isFileList" class="java.lang.Boolean" />
+      <property name="JTable.autoStartsEdit" class="java.lang.Boolean" />
+      <property name="terminateEditOnFocusLost" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JToolBar">
+      <property name="JToolBar.isRollover" class="java.lang.Boolean" />
+    </properties>
+    <properties class="javax.swing.JTree">
+      <property name="JTree.lineStyle" class="java.lang.String" />
+    </properties>
+    <properties class="javax.swing.text.JTextComponent">
+      <property name="caretAspectRatio" class="java.lang.Double" />
+      <property name="caretWidth" class="java.lang.Integer" />
+    </properties>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/modules/groovy-tools.iml" filepath="$PROJECT_DIR$/.idea/modules/groovy-tools.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/modules/groovy-tools_main.iml" filepath="$PROJECT_DIR$/.idea/modules/groovy-tools_main.iml" group="groovy-tools" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/modules/groovy-tools_test.iml" filepath="$PROJECT_DIR$/.idea/modules/groovy-tools_test.iml" group="groovy-tools" />
+      <module fileurl="file://$PROJECT_DIR$/src/main/main.iml" filepath="$PROJECT_DIR$/src/main/main.iml" />
+      <module fileurl="file://$PROJECT_DIR$/src/main/resources.iml" filepath="$PROJECT_DIR$/src/main/resources.iml" />
+      <module fileurl="file://$PROJECT_DIR$/src/main/test.iml" filepath="$PROJECT_DIR$/src/main/test.iml" />
+    </modules>
+  </component>
+</project>

.idea/modules/groovy-tools.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="groovy-tools" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$/../..">
+      <excludeFolder url="file://$MODULE_DIR$/../../.gradle" />
+      <excludeFolder url="file://$MODULE_DIR$/../../build" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules/groovy-tools_main.iml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="groovy-tools:main" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="" external.system.module.type="sourceSet" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8" inherit-compiler-output="false">
+    <output url="file://$MODULE_DIR$/../../build/classes/main" />
+    <exclude-output />
+    <content url="file://$MODULE_DIR$/../../src/main">
+      <sourceFolder url="file://$MODULE_DIR$/../../src/main/groovy" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/../../src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/../../src/main/test" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/../../src/main/resources" type="java-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Gradle: org.codehaus.groovy:groovy-all:2.4.8" level="project" />
+    <orderEntry type="library" name="Gradle: com.sun.mail:javax.mail:1.5.3" level="project" />
+    <orderEntry type="library" name="Gradle: org.spockframework:spock-core:1.0-groovy-2.4" level="project" />
+    <orderEntry type="library" name="Gradle: junit:junit:4.12" level="project" />
+    <orderEntry type="library" name="Gradle: javax.activation:activation:1.1" level="project" />
+    <orderEntry type="library" name="Gradle: org.hamcrest:hamcrest-core:1.3" level="project" />
+  </component>
+</module>

.idea/modules/groovy-tools_test.iml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="groovy-tools:test" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="" external.system.module.type="sourceSet" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8" inherit-compiler-output="false">
+    <output-test url="file://$MODULE_DIR$/../../build/classes/test" />
+    <exclude-output />
+    <content url="file://$MODULE_DIR$/../../src/test">
+      <sourceFolder url="file://$MODULE_DIR$/../../src/test/groovy" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/../../src/test/java" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/../../src/test/resources" type="java-test-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module" module-name="groovy-tools_main" />
+    <orderEntry type="library" name="Gradle: org.codehaus.groovy:groovy-all:2.4.8" level="project" />
+    <orderEntry type="library" name="Gradle: com.sun.mail:javax.mail:1.5.3" level="project" />
+    <orderEntry type="library" name="Gradle: org.spockframework:spock-core:1.0-groovy-2.4" level="project" />
+    <orderEntry type="library" name="Gradle: junit:junit:4.12" level="project" />
+    <orderEntry type="library" name="Gradle: javax.activation:activation:1.1" level="project" />
+    <orderEntry type="library" name="Gradle: org.hamcrest:hamcrest-core:1.3" level="project" />
+  </component>
+  <component name="TestModuleProperties" production-module="groovy-tools_main" />
+</module>

.idea/uiDesigner.xml

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
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+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
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+      <file leaf-file-name="Timing.groovy" pinned="false" current-in-tab="false">
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+      <file leaf-file-name="TestDataStructures.groovy" pinned="false" current-in-tab="false">
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+        <entry key="$PROJECT_DIR$" value="$USER_HOME$/Downloads/gradle-3.3" />
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+                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
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+              <ExternalTaskPojo>
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+                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
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+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/email/TestMailer.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/email/Mailer.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="180">
+          <caret line="10" column="0" lean-forward="false" selection-start-line="10" selection-start-column="0" selection-end-line="10" selection-end-column="0" />
+          <folding>
+            <marker date="1486323420620" expanded="true" signature="43:501" ph="..." />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Timing.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="36">
+          <caret line="2" column="13" lean-forward="false" selection-start-line="2" selection-start-column="13" selection-end-line="2" selection-end-column="13" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Process.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Timing.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="34">
+          <caret line="2" column="13" lean-forward="false" selection-start-line="2" selection-start-column="13" selection-end-line="2" selection-end-column="13" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Process.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="846">
+          <caret line="47" column="1" lean-forward="true" selection-start-line="47" selection-start-column="1" selection-end-line="47" selection-end-column="1" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Process.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$APPLICATION_CONFIG_DIR$/consoles/groovy/groovy_console.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.sun.mail/javax.mail/1.5.3/cce488a0fd790ac67ce658d66199ec9f5e194398/javax.mail-1.5.3-sources.jar!/javax/mail/Address.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="306">
+          <caret line="55" column="22" lean-forward="false" selection-start-line="55" selection-start-column="22" selection-end-line="55" selection-end-column="22" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/main.iml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/data/structures/SortingAlgorithms.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1148">
+          <caret line="95" column="1" lean-forward="false" selection-start-line="95" selection-start-column="1" selection-end-line="95" selection-end-column="1" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/email/TestMailer.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="72">
+          <caret line="4" column="13" lean-forward="false" selection-start-line="4" selection-start-column="13" selection-end-line="4" selection-end-column="13" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/build.gradle">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="198">
+          <caret line="11" column="0" lean-forward="false" selection-start-line="11" selection-start-column="0" selection-end-line="11" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/data/structure/Stack.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="36">
+          <caret line="2" column="0" lean-forward="false" selection-start-line="2" selection-start-column="0" selection-end-line="2" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/system/TestProcess.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="288">
+          <caret line="16" column="38" lean-forward="false" selection-start-line="16" selection-start-column="38" selection-end-line="16" selection-end-column="38" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Colorize.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="180">
+          <caret line="10" column="38" lean-forward="false" selection-start-line="10" selection-start-column="38" selection-end-line="10" selection-end-column="38" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Process.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="432">
+          <caret line="24" column="15" lean-forward="false" selection-start-line="24" selection-start-column="15" selection-end-line="24" selection-end-column="15" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/email/Mailer.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="72">
+          <caret line="16" column="6" lean-forward="false" selection-start-line="16" selection-start-column="6" selection-end-line="16" selection-end-column="6" />
+          <folding>
+            <marker date="1486323420620" expanded="true" signature="43:501" ph="..." />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Files.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="504">
+          <caret line="28" column="58" lean-forward="false" selection-start-line="28" selection-start-column="58" selection-end-line="28" selection-end-column="58" />
+          <folding>
+            <element signature="e#44#79#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/system/TestFiles.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="144">
+          <caret line="8" column="35" lean-forward="false" selection-start-line="8" selection-start-column="35" selection-end-line="8" selection-end-column="35" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/algorithm/FermatsLittleTheorm.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="144">
+          <caret line="8" column="15" lean-forward="false" selection-start-line="8" selection-start-column="15" selection-end-line="8" selection-end-column="15" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/algorithm/Sort.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="90">
+          <caret line="5" column="6" lean-forward="false" selection-start-line="5" selection-start-column="6" selection-end-line="5" selection-end-column="6" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/data/structure/BinaryTree.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1332">
+          <caret line="74" column="0" lean-forward="true" selection-start-line="74" selection-start-column="0" selection-end-line="74" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/data/structure/Queue.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="450">
+          <caret line="25" column="1" lean-forward="false" selection-start-line="25" selection-start-column="1" selection-end-line="25" selection-end-column="1" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/groovy/com/garypaduana/groovytools/system/Timing.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="396">
+          <caret line="22" column="31" lean-forward="false" selection-start-line="22" selection-start-column="31" selection-end-line="22" selection-end-column="31" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/data/structure/TestDataStructures.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="716">
+          <caret line="153" column="31" lean-forward="false" selection-start-line="153" selection-start-column="31" selection-end-line="153" selection-end-column="31" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/algorithm/TestFermatsLittleTheorm.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="342">
+          <caret line="19" column="5" lean-forward="false" selection-start-line="19" selection-start-column="5" selection-end-line="19" selection-end-column="5" />
+          <folding>
+            <element signature="e#47#95#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/resources/images/gray-icon.png">
+      <provider selected="true" editor-type-id="images">
+        <state />
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/resources/images/gray.png">
+      <provider selected="true" editor-type-id="images">
+        <state />
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/test/com/garypaduana/groovytools/algorithm/TestSort.groovy">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="540">
+          <caret line="30" column="42" lean-forward="false" selection-start-line="30" selection-start-column="42" selection-end-line="30" selection-end-column="42" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ArtifactsStructureConfigurable.UI">
+        <settings>
+          <artifact-editor />
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="FacetStructureConfigurable.UI">
+        <settings>
+          <last-edited>No facets are configured</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="GlobalLibrariesConfigurable.UI">
+        <settings>
+          <last-edited>groovy-2.4.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="JdkListConfigurable.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ModuleStructureConfigurable.UI">
+        <settings>
+          <last-edited>groovy-tools</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectLibrariesConfigurable.UI">
+        <settings>
+          <last-edited>Gradle: javax.activation:activation:1.1</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.3371841" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>

build.gradle

@@ -5,6 +5,8 @@ repositories {
 }
 
 dependencies {
-    compile "org.codehaus.groovy:groovy-all:2.4.8"
-    compile "com.sun.mail:javax.mail:1.5.3"
+    compile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.4.8'
+    compile group: 'com.sun.mail', name: 'javax.mail', version: '1.5.3'
+    compile group: 'org.spockframework', name: 'spock-core', version: '1.0-groovy-2.4'
+    compile group: 'junit', name: 'junit', version: '4.12'
 }

src/main/groovy/com/garypaduana/groovytools/algorithm/FermatsLittleTheorm.groovy

@@ -0,0 +1,35 @@
+package com.garypaduana.groovytools.algorithm
+
+class FermatsLittleTheorm{
+
+    /**
+     * Implementation of Fermat's Little Theorm to determine if a
+     * number is probably prime.
+     */
+    static def probablyPrime(def p){
+        for(int i = 0; i < 30; i++){
+            def a = randomBetween(2, p)
+            if(!congruentModulo(a.pow(p.intValue() - 1), 1, p)){
+                return false
+            }
+        }
+        return true
+    }
+
+    /**
+     * Returns a number between the two arguments inclusive to
+     * the first argument and exclusive of the second.  Ordering
+     * does not matter.
+     */
+    static def randomBetween(def a, def b){
+        Random r = new Random()
+        return BigInteger.valueOf((long) r.nextDouble() * (b - a) + a)
+    }
+
+    /**
+     * Determines if arguments a and b are congruent modulo to n.
+     */
+    static def congruentModulo(def a, def b, def n){
+        return (a - b) % n == 0
+    }
+}

src/main/groovy/com/garypaduana/groovytools/algorithm/Sort.groovy

@@ -0,0 +1,100 @@
+package com.garypaduana.groovytools.algorithm
+
+/**
+ * Created by gary on 2/5/17.
+ */
+class Sort{
+    static class SortingAlgorithms{
+
+        /**
+         * The algorithm starts at the beginning of the data set.
+         * It compares the first two elements, and if the first
+         * is greater than the second, it swaps them. It continues
+         * doing this for each pair of adjacent elements to the
+         * end of the data set. It then starts again with the first
+         * two elements, repeating until no swaps have occurred on
+         * the last pass.
+         */
+        def static bubbleSort(def array){
+            for(int k = array.size() - 1; k > 0; k--){
+                for(int i = 0; i < k; i++){
+                    if(array[i] > array[i + 1]){
+                        swap(array, i, i + 1)
+                    }
+                }
+            }
+            return array
+        }
+
+        /**
+         * The algorithm finds the minimum value, swaps it with
+         * the value in the first position, and repeats these steps
+         * for the remainder of the list. It does no more than n
+         * swaps, and thus is useful where swapping is very expensive.
+         */
+        def static selectionSort(def array){
+            for(int k = 0; k < array.size(); k++){
+                def min = array[k]
+                def minIndex = k
+                for(int i = k; i < array.size(); i++){
+                    if(array[i] < min){
+                        min = array[i]
+                        minIndex = i
+                    }
+                }
+                swap(array, k, minIndex)
+            }
+            return array
+        }
+
+        /**
+         * Quicksort is a divide and conquer algorithm which relies
+         * on a partition operation: to partition an array an element
+         * called a pivot is selected.  All elements smaller than the
+         * pivot are moved before it and all greater elements are moved
+         * after it. This can be done efficiently in linear time and
+         * in-place. The lesser and greater sublists are then
+         * recursively sorted. This yields average time complexity of
+         * O(n log n), with low overhead, and thus this is a popular algorithm.
+         */
+        def static quickSort(def array, def low, def high){
+            if(low < high){
+                def p = partition(array, low, high)
+                quickSort(array, low, p - 1)
+                quickSort(array, p + 1, high)
+            }
+            return array
+        }
+
+        def static partition(def array, def low, def high){
+            def pivotIndex = (int) ((high - low) / 2 + low)
+            if(pivotIndex == low){
+                pivotIndex++
+            }
+
+            def pivotValue = array[pivotIndex]
+
+            swap(array, pivotIndex, high)
+            def storeIndex = low
+
+            for(int i = low; i < high; i++){
+                if(array[i] <= pivotValue){
+                    swap(array, i, storeIndex)
+                    storeIndex++
+                }
+            }
+            swap(array, storeIndex, high)
+            return storeIndex
+        }
+
+        /**
+         * Swaps values found at positions i and j within array.
+         */
+        def static swap(def array, int i, int j){
+            def temp = array[i]
+            array[i] = array[j]
+            array[j] = temp
+            return array
+        }
+    }
+}

src/main/groovy/com/garypaduana/groovytools/data/structure/BinaryTree.groovy

@@ -0,0 +1,208 @@
+package com.garypaduana.groovytools.data.structure
+
+class BinaryTree{
+
+    static class Node{
+        def leftChild
+        def rightChild
+        def element
+        def parent
+
+        Node(def element){
+            this.element = element
+        }
+
+        @Override
+        public String toString(){
+            return element
+        }
+    }
+
+    def root
+
+    def insert(def element){
+
+        if(root == null){
+            root = new Node(element)
+        }
+        else{
+            def focusNode = root
+            while(true){
+                if(element < focusNode.element){
+                    if(focusNode.leftChild == null){
+                        focusNode.leftChild = new Node(element)
+                        focusNode.leftChild.parent = focusNode
+                        return
+                    }
+                    else{
+                        focusNode = focusNode.leftChild
+                    }
+                }
+                else if(element > focusNode.element){
+                    if(focusNode.rightChild == null){
+                        focusNode.rightChild = new Node(element)
+                        focusNode.rightChild.parent = focusNode
+                        return
+                    }
+                    else{
+                        focusNode = focusNode.rightChild
+                    }
+                }
+                else{
+                    return
+                }
+            }
+        }
+    }
+
+    def contains(def element){
+        def node = root
+        while(true){
+            if(node == null){
+                return false
+            }
+            if(element < node.element){
+                node = node.leftChild
+            }
+            else if(element > node.element){
+                node = node.rightChild
+            }
+            else if(element == node.element){
+                return true
+            }
+        }
+    }
+
+    def preOrderTraverse(){
+        return preOrderTraverse(root)
+    }
+
+    def preOrderTraverse(def node){
+        if(node == null){
+            return []
+        }
+
+        def elements = []
+        elements.add(node.element)
+
+        if(node.leftChild != null){
+            elements.addAll(preOrderTraverse(node.leftChild))
+        }
+        if(node.rightChild != null){
+            elements.addAll(preOrderTraverse(node.rightChild))
+        }
+
+        return elements
+    }
+
+    def inOrderTraverse(){
+        return inOrderTraverse(root)
+    }
+
+    def inOrderTraverse(def node){
+        if(node == null){
+            return []
+        }
+
+        def elements = []
+        if(node.leftChild != null){
+            elements.addAll(inOrderTraverse(node.leftChild))
+        }
+        elements.add(node.element)
+        if(node.rightChild != null){
+            elements.addAll(inOrderTraverse(node.rightChild))
+        }
+
+        return elements
+    }
+
+    def postOrderTraverse(){
+        return postOrderTraverse(root)
+    }
+
+    def postOrderTraverse(def node){
+        if(node == null){
+            return []
+        }
+
+        def elements = []
+        if(node.leftChild != null){
+            elements.addAll(postOrderTraverse(node.leftChild))
+        }
+        if(node.rightChild != null){
+            elements.addAll(postOrderTraverse(node.rightChild))
+        }
+        elements.add(node.element)
+
+        return elements
+    }
+
+    def iterativePreorderTraverse(){
+        return iterativePreorderTraverse(root)
+    }
+
+    def iterativePreorderTraverse(def node){
+        def elements = []
+        def parentStack = new Stack()
+
+        while(parentStack.size() != 0 || node != null){
+            if(node != null){
+                elements.add(node.element)
+                if(node.rightChild != null){
+                    parentStack.push(node.rightChild)
+                }
+                node = node.leftChild
+            }
+            else{
+                node = parentStack.pop()
+            }
+        }
+
+        return elements
+    }
+
+    def iterativeInOrderTraverse(){
+        return iterativeInOrderTraverse(root)
+    }
+
+    def iterativeInOrderTraverse(def node){
+        def elements = []
+        def parentStack = new Stack()
+
+        while(parentStack.size() != 0 || node != null){
+            if(node != null){
+                parentStack.push(node)
+                node = node.leftChild
+            }
+            else{
+                node = parentStack.pop()
+                elements.add(node.element)
+                node = node.rightChild
+            }
+        }
+        return elements
+    }
+
+    def levelOrderTraverse(){
+        return levelOrderTraverse(root)
+    }
+
+    def levelOrderTraverse(def node){
+        def q = new Queue()
+        q.enqueue(node)
+        def elements = []
+
+        while(q.size() > 0){
+            node = q.dequeue()
+            elements.add(node.element)
+
+            if(node.leftChild != null){
+                q.enqueue(node.leftChild)
+            }
+            if(node.rightChild != null){
+                q.enqueue(node.rightChild)
+            }
+        }
+        return elements
+    }
+}

src/main/groovy/com/garypaduana/groovytools/data/structure/Queue.groovy

@@ -0,0 +1,26 @@
+package com.garypaduana.groovytools.data.structure
+
+class Queue{
+
+    def data = []
+
+    def enqueue(def element){
+        // add element just before index 0
+        data.add(0, element)
+    }
+
+    def dequeue(def element){
+        if(data.size() > 0){
+            return data.pop()
+        }
+        return null
+    }
+
+    def size(){
+        return data.size()
+    }
+
+    def peek(){
+        return data.get(data.size() - 1)
+    }
+}

src/main/groovy/com/garypaduana/groovytools/data/structure/Stack.groovy

@@ -0,0 +1,25 @@
+package com.garypaduana.groovytools.data.structure
+
+class Stack{
+
+    private def data = []
+
+    def pop(){
+        if(data.size() > 0){
+            return data.pop()
+        }
+        return null
+    }
+
+    def push(def element){
+        data.add(element)
+    }
+
+    def peek(){
+        return data.get(data.size() - 1)
+    }
+
+    def size(){
+        return data.size()
+    }
+}

src/main/groovy/com/garypaduana/groovytools/email/Mailer.groovy

@@ -1,11 +1,8 @@
 package com.garypaduana.groovytools.email
 
-import java.util.Properties
-
 import javax.activation.DataHandler
 import javax.activation.DataSource
 import javax.activation.FileDataSource
-import javax.mail.Address
 import javax.mail.Message
 import javax.mail.MessagingException
 import javax.mail.Multipart
@@ -17,11 +14,9 @@ import javax.mail.internet.MimeBodyPart
 import javax.mail.internet.MimeMessage
 import javax.mail.internet.MimeMultipart
 
-import java.security.MessageDigest
-
-public class Mailer {
+class Mailer {
 
-    public static void sendEmail(String username, String password, String toAddresses,
+    static void sendEmail(String username, String password, String toAddresses,
             String subject, String text, Collection<File> attachments) throws MessagingException {
 
         Properties props = new Properties()

src/main/groovy/com/garypaduana/groovytools/system/Colorize.groovy

@@ -0,0 +1,13 @@
+package com.garypaduana.groovytools.system
+
+class Colorize{
+
+    static def red = '\033[0;31m'
+    static def green = '\033[0;32m'
+    static def blue ='\033[1;34m'
+    static def nc = '\033[0m'
+
+    static def colorize(def value, def color){
+        return "${color}${value}${nc}"
+    }
+}

src/main/groovy/com/garypaduana/groovytools/system/Files.groovy

@@ -0,0 +1,36 @@
+package com.garypaduana.groovytools.system
+
+import java.awt.image.BufferedImage
+import java.io.File
+import javax.imageio.ImageIO
+
+class Files{
+
+    static def copy(File source, File dest){
+        source.withInputStream(){ bis ->
+            dest.withOutputStream(){ bos ->
+                byte[] buffer = new byte[8192]
+                int bytesRead = 0
+                while((bytesRead = (bis.read(buffer, 0, buffer.length))) != -1){
+                    bos.write(buffer, 0, bytesRead)
+                }
+            }
+        }
+    }
+
+    static def findImagesLargerThan(File rootDir, int width, int height){
+        def matchedFiles = []
+        rootDir.eachFileRecurse(){ sf ->
+            if(sf.getName() ==~ /.+(JPG|jpg|PNG|png)/ && sf.isFile()){
+                def img = ImageIO.read(sf)
+                if(img != null && img.getWidth() >= Integer.valueOf(width) &&
+                        img.getHeight() >= Integer.valueOf(height)){
+
+                    matchedFiles.add(sf.getAbsolutePath())
+                }
+            }
+        }
+
+        return matchedFiles
+    }
+}

src/main/groovy/com/garypaduana/groovytools/system/Process.groovy

@@ -1,18 +1,18 @@
 package com.garypaduana.groovytools.system
 
-public class Process {
-    
+class Process{
+
     /**
      * Convenience method wrapper for execute(String command, boolean print)
      */
-    public static def execute(String command){
+    static def execute(String command){
         return execute(command, true)
     }
 
     /**
      * Convenience method wrapper for execute(List<String> command, boolean print)
      */
-    public static def execute(List<String> command){
+    static def execute(List<String> command){
         return execute(command, true)
     }
 
@@ -22,7 +22,7 @@ public class Process {
      * @param print - should the output be printed to console line by line?
      * @return String - the complete output
      */
-    public static def execute(String command, boolean print){
+    static def execute(String command, boolean print){
         return execute(new ArrayList<String>(Arrays.asList(command.split(" "))), print)
     }
 
@@ -32,11 +32,11 @@ public class Process {
      * @param print - should the output be printed to console line by line?
      * @return String - the complete output
      */
-    public static def execute(List<String> command, boolean print){
+    static def execute(List<String> command, boolean print){
         StringBuilder sb = new StringBuilder()
         println "Executing: ${command.join(' ')}"
         def process = new ProcessBuilder(command).redirectErrorStream(true).start()
-        process.inputStream.eachLine {
+        process.inputStream.eachLine{
             if(print){
                 println it
             }

src/main/groovy/com/garypaduana/groovytools/system/Timing.groovy

@@ -1,20 +1,25 @@
 package com.garypaduana.groovytools.system
 
-public class Timing {
-    
-    public static def delay(def start, def end){
-        (start..end).each(){count ->
+class Timing{
+
+    static def delay(def start, def end){
+        (start..end).each(){ count ->
             Thread.sleep(1000)
             if(count % 10 == 0){
                 print count
-            }
-            else if(count == end){
+            } else if(count == end){
                 print count
-            }
-            else{
+            } else{
                 print "."
             }
         }
         println ""
     }
+
+    static def timeIt = { closure ->
+        def start = System.nanoTime()
+        def result = closure()
+        def duration = (System.nanoTime() - start) / 1e6
+        return [returnValue: result, duration: duration]
+    }
 }

src/main/main.iml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/groovy" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="groovy-2.4.8" level="application" />
+    <orderEntry type="library" name="Gradle: com.sun.mail:javax.mail:1.5.3" level="project" />
+    <orderEntry type="library" name="Gradle: org.spockframework:spock-core:1.0-groovy-2.4" level="project" />
+    <orderEntry type="library" name="Gradle: org.spockframework:spock-core:1.0-groovy-2.4" level="project" />
+  </component>
+</module>

src/main/resources.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="groovy-2.4.8" level="application" />
+  </component>
+</module>

src/main/test.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="groovy-2.4.8" level="application" />
+  </component>
+</module>

src/main/test/com/garypaduana/groovytools/algorithm/TestFermatsLittleTheorm.groovy

@@ -0,0 +1,21 @@
+package com.garypaduana.groovytools.algorithm
+
+import com.garypaduana.groovytools.system.Timing
+import spock.lang.Specification
+
+class TestFermatsLittleTheorm extends Specification{
+
+    def "test with known prime"(){
+        when:
+            def result = Timing.timeIt({FermatsLittleTheorm.probablyPrime(15485867)})
+        then:
+            result.returnValue == true
+    }
+
+    def "test with known composite"(){
+        when:
+            def result = Timing.timeIt({FermatsLittleTheorm.probablyPrime(2398932)})
+        then:
+            result.returnValue == false
+    }
+}

src/main/test/com/garypaduana/groovytools/algorithm/TestSort.groovy

@@ -0,0 +1,33 @@
+package com.garypaduana.groovytools.algorithm
+
+import spock.lang.Specification
+
+class TestSort extends Specification{
+
+    def "test bubble sort"(){
+        setup:
+            def array = [6, 5, 4, 3, 2, 1, 0]
+        when:
+            Sort.SortingAlgorithms.bubbleSort(array)
+        then:
+            array == [0, 1, 2, 3, 4, 5, 6]
+    }
+
+    def "test selection sort"(){
+        setup:
+            def array = [6, 5, 4, 3, 2, 1, 0]
+        when:
+            Sort.SortingAlgorithms.selectionSort(array)
+        then:
+            array == [0, 1, 2, 3, 4, 5, 6]
+    }
+
+    def "test quick sort"(){
+        setup:
+            def array = [6, 5, 4, 3, 2, 1, 0]
+        when:
+            Sort.SortingAlgorithms.quickSort(array, 0, array.size() - 1)
+        then:
+            array == [0, 1, 2, 3, 4, 5, 6]
+    }
+}

src/main/test/com/garypaduana/groovytools/data/structure/TestDataStructures.groovy

@@ -0,0 +1,186 @@
+package com.garypaduana.groovytools.data.structure
+
+import spock.lang.Specification
+
+class TestDataStructures extends Specification{
+
+    def "adding an element to a Stack leads to size increase"(){
+        setup:
+            def stack = new Stack()
+        when:
+            stack.push(42)
+        then:
+            stack.size() == 1
+    }
+
+    def "popping an element leads to a size decrease"(){
+        setup:
+            def stack = new Stack()
+        when:
+            stack.push(42)
+            def value = stack.pop()
+        then:
+            stack.size() == 0
+            value == 42
+    }
+
+    def "peeking into a stack doesn't change the size"(){
+        setup:
+            def stack = new Stack()
+        when:
+            stack.push(42)
+            def value = stack.peek()
+        then:
+            value == 42
+            stack.size() == 1
+    }
+
+    def "a stack exhibits lifo ordering"(){
+        setup:
+            def stack = new Stack()
+        when:
+            stack.push(42)
+            stack.push(78)
+        then:
+            stack.pop() == 78
+            stack.pop() == 42
+            stack.pop() == null
+    }
+
+    def "a queue exhibits fifo ordering"(){
+        setup:
+            def queue = new Queue()
+        when:
+            queue.enqueue(1)
+            queue.enqueue(2)
+            queue.enqueue(3)
+        then:
+            queue.dequeue() == 1
+            queue.dequeue() == 2
+            queue.dequeue() == 3
+            queue.dequeue() == null
+            queue.size() == 0
+    }
+
+    def "peek into queue doesn't change the size"(){
+        setup:
+            def queue = new Queue()
+        when:
+            queue.enqueue(42)
+            queue.enqueue(45)
+        then:
+            queue.peek() == 42
+            queue.size() == 2
+    }
+
+    def "binary tree creation"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            binaryTree.insert(20)
+            binaryTree.insert(15)
+            binaryTree.insert(18)
+            binaryTree.insert(25)
+        then:
+            binaryTree.root.leftChild.element == 15
+            binaryTree.root.leftChild.rightChild.element == 18
+            binaryTree.root.rightChild.element == 25
+            binaryTree.root.leftChild.parent.element == 20
+            binaryTree.root.leftChild.rightChild.parent.element == 15
+    }
+
+    /**
+     * https://en.wikipedia.org/wiki/Tree_traversal#Types
+     */
+    def "pre-order traverse test"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            binaryTree.preOrderTraverse() == "FBADCEGIH".toCharArray()
+    }
+
+    def "in-order traverse test"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            binaryTree.inOrderTraverse() == "ABCDEFGHI".toCharArray()
+    }
+
+    def "post-order traverse test"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            binaryTree.postOrderTraverse() == "ACEDBHIGF".toCharArray()
+    }
+
+    def "pre-order iterative equal to recursive"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            binaryTree.preOrderTraverse() == binaryTree.iterativePreorderTraverse()
+    }
+
+    def "in-order iterative equal to recursive"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            binaryTree.inOrderTraverse() == binaryTree.iterativeInOrderTraverse()
+    }
+
+    def "level-order iterative equal to recursive"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            binaryTree.levelOrderTraverse() == "FBGADICEH".toCharArray()
+    }
+
+    def "tree contains elements"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            "ABCDEFGHI".each(){
+                assert binaryTree.contains(it)
+            }
+    }
+
+    def "tree doesn't contain element"(){
+        setup:
+            def binaryTree = new BinaryTree()
+        when:
+            "FBGADICEH".each(){
+                binaryTree.insert(it)
+            }
+        then:
+            "JKLMNOPQRSTUV".each(){
+                assert binaryTree.contains(it) == false
+            }
+    }
+}

src/main/test/com/garypaduana/groovytools/system/TestFiles.groovy

@@ -0,0 +1,18 @@
+package com.garypaduana.groovytools.system
+
+import spock.lang.Specification
+
+class TestFiles extends Specification {
+
+    def "test find images larger than size"(){
+        setup:
+            def source = new File("src/main/resources/images")
+        when:
+            def results = Files.findImagesLargerThan(source, 800, 800)
+        then:
+            results.each(){
+                println it
+            }
+            results.size() == 1
+    }
+}

src/main/test/com/garypaduana/groovytools/system/TestProcess.groovy

@@ -0,0 +1,24 @@
+package com.garypaduana.groovytools.system
+
+import spock.lang.Specification
+
+class TestProcess extends Specification{
+
+    def "test process successful"(){
+        when:
+            def result = Process.execute("ls -lart", true)
+        then:
+            result.exitValue == 0
+            result.body.length() > 0
+    }
+
+    def "test colored console text"(){
+        setup:
+            def line = "Hello, in Red!"
+        when:
+            def value = "${Colorize.colorize(line, Colorize.red)}"
+            println value
+        then:
+            value.equals("${Colorize.red}$line${Colorize.nc}")
+    }
+}