From 9416cec9c245e8998f29071635be4e416946e1a4 Mon Sep 17 00:00:00 2001
From: Tarun Gupta <tarun1995gupta@gmail.com>
Date: Fri, 22 May 2015 00:33:55 +0530
Subject: Add functionality for UUID Generator.

Adds the Simple ID Generator as well as Random ID Generator.

License:
This patch is BSD-licensed, see Documentation/Licenses/BSD-simplified.txt for details.

Test-Information:
Tests added for both IDGenerator and SimpleIDGenerator which passes.

Change-Id: I9bce3a172774effead3ada695bcceb0b0f81b851

diff --git a/src/com/isode/stroke/base/IDGenerator.java b/src/com/isode/stroke/base/IDGenerator.java
new file mode 100644
index 0000000..d08b8fa
--- /dev/null
+++ b/src/com/isode/stroke/base/IDGenerator.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2010-2011 Isode Limited.
+ * All rights reserved.
+ * See the COPYING file for more information.
+ */
+/*
+ * Copyright (c) 2015 Tarun Gupta.
+ * Licensed under the simplified BSD license.
+ * See Documentation/Licenses/BSD-simplified.txt for more information.
+ */
+
+package com.isode.stroke.base;
+
+import java.util.UUID;
+
+public class IDGenerator {
+
+	/**
+	* IDGenerator();
+	*/
+	public IDGenerator() {
+
+	}
+
+	/**
+	* Randomly generates a UUID.
+	* @return String representation of the UUID, which will never be null.
+	*/
+	public static String generateID() {
+		return UUID.randomUUID().toString();
+	}
+}
\ No newline at end of file
diff --git a/src/com/isode/stroke/base/SimpleIDGenerator.java b/src/com/isode/stroke/base/SimpleIDGenerator.java
new file mode 100644
index 0000000..4242a87
--- /dev/null
+++ b/src/com/isode/stroke/base/SimpleIDGenerator.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2010-2015 Isode Limited.
+ * All rights reserved.
+ * See the COPYING file for more information.
+ */
+/*
+ * Copyright (c) 2015 Tarun Gupta.
+ * Licensed under the simplified BSD license.
+ * See Documentation/Licenses/BSD-simplified.txt for more information.
+ */
+
+package com.isode.stroke.base;
+
+import com.isode.stroke.base.IDGenerator;
+
+/**
+ * @brief The SimpleIDGenerator class implements a IDGenerator generating consecutive ID strings from
+ * the lower case latin alphabet.
+ */
+public class SimpleIDGenerator extends IDGenerator {
+
+	private static String currentID;
+
+	/**
+	* Constructor
+	*/
+	public SimpleIDGenerator() {
+		currentID = "";
+	}
+
+	/**
+	* Simply generates a UUID.
+	* @return a String which will never be null or empty.
+	*/
+	public static String generateID() {
+		boolean carry = true;
+		int i = 0;
+		char[] char_currentID = currentID.toCharArray();
+		while (carry && i < char_currentID.length) {
+			char c = char_currentID[i];
+			if (c >= 'z') {
+				char_currentID[i] = 'a';
+			}
+			else {
+				char_currentID[i] = (char)(c+1);
+				carry = false;
+			}
+			++i;
+		}
+		currentID = String.valueOf(char_currentID);
+		if (carry) {
+			currentID += 'a';
+		}
+		return currentID;
+	}
+}
\ No newline at end of file
diff --git a/test/com/isode/stroke/base/IDGeneratorTest.java b/test/com/isode/stroke/base/IDGeneratorTest.java
new file mode 100644
index 0000000..34d8cc3
--- /dev/null
+++ b/test/com/isode/stroke/base/IDGeneratorTest.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2010 Isode Limited.
+ * All rights reserved.
+ * See the COPYING file for more information.
+ */
+/*
+ * Copyright (c) 2015 Tarun Gupta.
+ * Licensed under the simplified BSD license.
+ * See Documentation/Licenses/BSD-simplified.txt for more information.
+ */
+
+package com.isode.stroke.base;
+
+import static org.junit.Assert.assertTrue;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import com.isode.stroke.base.IDGenerator;
+import java.util.*;
+
+public class IDGeneratorTest {
+
+	private Set<String> generatedIDs_ = new HashSet<String>();
+
+	/**
+	* Constructor
+	*/
+	public IDGeneratorTest() {
+
+	}
+
+	/**
+	* Clears the set generatedIDs_.
+	*/
+	void setUp() {
+		generatedIDs_.clear();
+	}
+
+	/**
+	* Tests randomly generated UUID functionality 
+	*/
+	@Test
+	public void testGenerate() {
+		IDGenerator testling = new IDGenerator();
+		for(int i = 0; i < 26*4; ++i) {
+			String id = testling.generateID();
+			assertTrue(generatedIDs_.add(id));
+		}
+	}
+}
\ No newline at end of file
diff --git a/test/com/isode/stroke/base/SimpleIDGeneratorTest.java b/test/com/isode/stroke/base/SimpleIDGeneratorTest.java
new file mode 100644
index 0000000..d4c021d
--- /dev/null
+++ b/test/com/isode/stroke/base/SimpleIDGeneratorTest.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2010 Isode Limited.
+ * All rights reserved.
+ * See the COPYING file for more information.
+ */
+/*
+ * Copyright (c) 2015 Tarun Gupta.
+ * Licensed under the simplified BSD license.
+ * See Documentation/Licenses/BSD-simplified.txt for more information.
+ */
+
+package com.isode.stroke.base;
+
+import static org.junit.Assert.assertTrue;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import com.isode.stroke.base.SimpleIDGenerator;
+import java.util.*;
+
+public class SimpleIDGeneratorTest {
+
+	private Set<String> generatedIDs_ = new HashSet<String>();
+
+	/**
+	* Constructor
+	*/
+	public SimpleIDGeneratorTest() {
+
+	}
+
+	/**
+	* Clears the set generatedIDs_.
+	*/
+	void setUp() {
+		generatedIDs_.clear();
+	}
+
+	/**
+	* Tests randomly generated UUID functionality 
+	*/
+	@Test
+	public void testGenerate() {
+		SimpleIDGenerator testling = new SimpleIDGenerator();
+		for(int i = 0; i < 26*4; ++i) {
+			String id = testling.generateID();
+			assertTrue(generatedIDs_.add(id));
+		}
+	}
+}
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