common/tests/org.eclipse.jpt.common.utility.tests/src/org/eclipse/jpt/common/utility/tests/internal/IdentityHashBagTests.java - dali/webtools.dali - Git at Google

 /*******************************************************************************
  * Copyright (c) 2007, 2010 Oracle. All rights reserved.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v1.0, which accompanies this distribution
  * and is available at http://www.eclipse.org/legal/epl-v10.html.
  *
  * Contributors:
  *     Oracle - initial API and implementation
  ******************************************************************************/
 package org.eclipse.jpt.common.utility.tests.internal;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
 import java.util.NoSuchElementException;

 import junit.framework.TestCase;

 import org.eclipse.jpt.common.utility.internal.ArrayTools;
 import org.eclipse.jpt.common.utility.internal.CollectionTools;
 import org.eclipse.jpt.common.utility.internal.IdentityHashBag;
 import org.eclipse.jpt.common.utility.internal.Tools;

 @SuppressWarnings("nls")
 public class IdentityHashBagTests extends TestCase {
 	private IdentityHashBag<String> bag;
 	private String one = "one";
 	private String two = "two";
 	private String three = "three";
 	private String four = "four";
 	private String foo = "foo";
 	private String bar = "bar";

 	public IdentityHashBagTests(String name) {
 		super(name);
 	}

 	@Override
 	protected void setUp() throws Exception {
 		super.setUp();
 		this.bag = this.buildBag();
 	}

 	protected IdentityHashBag<String> buildBag() {
 		IdentityHashBag<String> result = new IdentityHashBag<String>();
 		result.add(null);
 		result.add(this.one);
 		result.add(this.two);
 		result.add(this.two);
 		result.add(this.three);
 		result.add(this.three);
 		result.add(this.three);
 		result.add(this.four);
 		result.add(this.four);
 		result.add(this.four);
 		result.add(this.four);
 		return result;
 	}

 	@Override
 	protected void tearDown() throws Exception {
 		TestTools.clear(this);
 		super.tearDown();
 	}

 	private Collection<String> buildCollection() {
 		Collection<String> c = new ArrayList<String>();
 		c.add(this.foo);
 		c.add(this.foo);
 		c.add(this.bar);
 		c.add(this.bar);
 		c.add(this.bar);
 		return c;
 	}

 	public void testCtorCollection() {
 		Collection<String> c = this.buildCollection();
 		IdentityHashBag<String> localBag = new IdentityHashBag<String>(c);
 		for (String s : c) {
 			assertTrue(localBag.contains(s));
 		}
 	}

 	public void testCtorIntFloat() {
 		boolean exCaught;

 		exCaught = false;
 		try {
 			this.bag = new IdentityHashBag<String>(-20, 0.66f);
 		} catch (IllegalArgumentException ex) {
 			exCaught = true;
 		}
 		assertTrue("IllegalArgumentException not thrown", exCaught);

 		exCaught = false;
 		try {
 			this.bag = new IdentityHashBag<String>(20, -0.66f);
 		} catch (IllegalArgumentException ex) {
 			exCaught = true;
 		}
 		assertTrue("IllegalArgumentException not thrown", exCaught);
 	}

 	public void testAdd() {
 		// the other adds took place in setUp
 		String five = "five";
 		assertTrue(this.bag.add(five));

 		assertTrue(this.bag.contains(this.one));
 		assertTrue(this.bag.contains(this.two));
 		assertTrue(this.bag.contains(this.three));
 		assertTrue(this.bag.contains(this.four));
 		assertTrue(this.bag.contains(five));
 	}

 	public void testAddCount() {
 		String minus3 = "minus3";
 		String zero = "zero";
 		String five = "five";
 		// the other adds took place in setUp
 		this.bag.add(minus3, -3);
 		this.bag.add(zero, 0);
 		this.bag.add(five, 5);

 		assertFalse(this.bag.contains(minus3));
 		assertFalse(this.bag.contains(zero));
 		assertEquals(1, this.bag.count(this.one));
 		assertEquals(2, this.bag.count(this.two));
 		assertEquals(3, this.bag.count(this.three));
 		assertEquals(4, this.bag.count(this.four));
 		assertEquals(5, this.bag.count(five));

 		this.bag.add(this.three, 2);
 		assertEquals(5, this.bag.count(this.three));
 	}

 	public void testAddAll() {
 		Collection<String> c = this.buildCollection();
 		assertTrue(this.bag.addAll(c));
 		for (String s : c) {
 			assertTrue(this.bag.contains(s));
 		}
 	}

 	public void testClear() {
 		assertTrue(this.bag.contains(this.one));
 		assertTrue(this.bag.contains(this.two));
 		assertTrue(this.bag.contains(this.three));
 		assertTrue(this.bag.contains(this.four));
 		assertTrue(this.bag.contains(null));
 		assertEquals(11, this.bag.size());
 		this.bag.clear();
 		assertFalse(this.bag.contains(this.one));
 		assertFalse(this.bag.contains(this.two));
 		assertFalse(this.bag.contains(this.three));
 		assertFalse(this.bag.contains(this.four));
 		assertFalse(this.bag.contains(null));
 		assertEquals(0, this.bag.size());
 	}

 	public void testClone() {
 		IdentityHashBag<String> bag2 = this.bag.clone();
 		assertTrue("bad clone", this.bag != bag2);
 		assertEquals("bad clone", this.bag, bag2);
 		assertTrue("bad clone", this.bag.hashCode() == bag2.hashCode());
 	}

 	public void testContains() {
 		assertTrue(this.bag.contains(null));
 		assertTrue(this.bag.contains(this.one));
 		assertTrue(this.bag.contains(this.two));
 		assertTrue(this.bag.contains(this.three));
 		assertTrue(this.bag.contains(this.four));

 		assertFalse(this.bag.contains(new String("four")));
 		assertFalse(this.bag.contains("five"));
 	}

 	public void testContainsAll() {
 		Collection<String> c = new ArrayList<String>();
 		c.add(null);
 		c.add(this.one);
 		c.add(this.two);
 		c.add(this.three);
 		c.add(this.four);
 		assertTrue(this.bag.containsAll(c));
 		c.add(new String(this.four));
 		assertFalse(this.bag.containsAll(c));
 	}

 	public void testCount() {
 		assertEquals(0, this.bag.count("zero"));
 		assertEquals(1, this.bag.count("one"));
 		assertEquals(2, this.bag.count("two"));
 		assertEquals(3, this.bag.count("three"));
 		assertEquals(4, this.bag.count("four"));
 		assertEquals(0, this.bag.count("five"));
 	}

 	public void testEquals() {
 		IdentityHashBag<String> bag2 = this.buildBag();
 		assertEquals(this.bag, bag2);
 		bag2.add("five");
 		assertFalse(this.bag.equals(bag2));
 		Collection<String> c = new ArrayList<String>(this.bag);
 		assertFalse(this.bag.equals(c));
 	}

 	public void testHashCode() {
 		IdentityHashBag<String> bag2 = this.buildBag();
 		assertEquals(this.bag.hashCode(), bag2.hashCode());
 	}

 	public void testIsEmpty() {
 		assertFalse(this.bag.isEmpty());
 		this.bag.clear();
 		assertTrue(this.bag.isEmpty());
 		this.bag.add("foo");
 		assertFalse(this.bag.isEmpty());
 	}

 	public void testEmptyIterator() {
 		this.bag.clear();
 		Iterator<String> iterator = this.bag.iterator();
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue("NoSuchElementException not thrown: " + element, exCaught);

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue("IllegalStateException not thrown", exCaught);
 	}

 	public void testIterator() {
 		int i = 0;
 		Iterator<String> iterator = this.bag.iterator();
 		assertTrue(iterator.hasNext());
 		while (iterator.hasNext()) {
 			iterator.next();
 			i++;
 		}
 		assertEquals(11, i);
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue("NoSuchElementException not thrown: " + element, exCaught);

 		iterator.remove();
 		assertEquals(10, this.bag.size());

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue("IllegalStateException not thrown", exCaught);

 		// start over
 		iterator = this.bag.iterator();
 		this.bag.add("five");
 		exCaught = false;
 		try {
 			iterator.next();
 		} catch (ConcurrentModificationException ex) {
 			exCaught = true;
 		}
 		assertTrue("ConcurrentModificationException not thrown", exCaught);
 	}

 	public void testUniqueIterator() {
 		int i = 0;
 		Iterator<String> iterator = this.bag.uniqueIterator();
 		assertTrue(iterator.hasNext());
 		while (iterator.hasNext()) {
 			iterator.next();
 			i++;
 		}
 		assertEquals(5, i);
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 			fail(element.toString());
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.uniqueIterator();
 		Object next = null;
 		while (iterator.hasNext() && !this.four.equals(next)) {
 			next = iterator.next();
 		}
 		iterator.remove();
 		assertEquals(7, this.bag.size());

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.uniqueIterator();
 		String five = "five";
 		this.bag.add(five);
 		exCaught = false;
 		try {
 			iterator.next();
 		} catch (ConcurrentModificationException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testEntries() {
 		int i = 0;
 		Iterator<org.eclipse.jpt.common.utility.internal.Bag.Entry<String>> iterator = this.bag.entries();
 		assertTrue(iterator.hasNext());
 		while (iterator.hasNext()) {
 			iterator.next();
 			i++;
 		}
 		assertEquals(5, i);
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 			fail(element.toString());
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.entries();
 		org.eclipse.jpt.common.utility.internal.Bag.Entry<String> next = null;
 		while (iterator.hasNext()) {
 			next = iterator.next();
 			if (next.getElement().equals(this.four)) {
 				iterator.remove();
 				break;
 			}
 		}
 		assertEquals(7, this.bag.size());

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.entries();
 		String five = "five";
 		this.bag.add(five);
 		exCaught = false;
 		try {
 			iterator.next();
 		} catch (ConcurrentModificationException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testHashingDistribution() throws Exception {
 		IdentityHashBag<String> bigBag = new IdentityHashBag<String>();
 		for (int i = 0; i < 10000; i++) {
 			bigBag.add("object" + i);
 		}

 		java.lang.reflect.Field field = bigBag.getClass().getDeclaredField("table");
 		field.setAccessible(true);
 		Object[] table = (Object[]) field.get(bigBag);
 		int bucketCount = table.length;
 		int filledBucketCount = 0;
 		for (int i = 0; i < bucketCount; i++) {
 			if (table[i] != null) {
 				filledBucketCount++;
 			}
 		}
 		float loadFactor = ((float) filledBucketCount) / ((float) bucketCount);
 		if ((loadFactor < 0.20) || (loadFactor > 0.80)) {
 			String msg = "poor load factor: " + loadFactor;
 			if (Tools.jvmIsSun()) {
 				fail(msg);
 			} else {
 				// poor load factor is seen in the Eclipse build environment for some reason...
 				System.out.println(this.getClass().getName() + '.' + this.getName() + " - " + msg);
 				TestTools.printSystemProperties();
 			}
 		}
 	}

 	public void testRemove() {
 		assertTrue(this.bag.remove(this.one));
 		assertFalse(this.bag.contains(this.one));
 		assertFalse(this.bag.remove(this.one));

 		assertTrue(this.bag.remove(this.two));
 		assertTrue(this.bag.remove(this.two));
 		assertFalse(this.bag.contains(this.two));
 		assertFalse(this.bag.remove(this.two));

 		assertFalse(this.bag.remove(new String(this.three)));
 	}

 	public void testRemoveCount() {
 		assertFalse(this.bag.remove(this.one, 0));
 		assertTrue(this.bag.contains(this.one));

 		assertTrue(this.bag.remove(this.one, 1));
 		assertFalse(this.bag.contains(this.one));
 		assertFalse(this.bag.remove(this.one));

 		assertFalse(this.bag.remove(this.two, -3));
 		assertTrue(this.bag.remove(this.two, 1));
 		assertTrue(this.bag.contains(this.two));

 		assertTrue(this.bag.remove(this.two, 1));
 		assertFalse(this.bag.contains(this.two));
 		assertFalse(this.bag.remove(this.two));

 		assertTrue(this.bag.remove(this.three, 3));
 		assertFalse(this.bag.contains(this.three));
 		assertFalse(this.bag.remove(this.three));
 	}

 	public void testRemoveAll() {
 		Collection<String> c = new ArrayList<String>();
 		c.add(this.one);
 		c.add(new String(this.two));
 		c.add(this.three);
 		assertTrue(this.bag.removeAll(c));
 		assertFalse(this.bag.contains(this.one));
 		assertTrue(this.bag.contains(this.two));
 		assertFalse(this.bag.contains(this.three));
 		assertFalse(this.bag.remove(this.one));
 		assertTrue(this.bag.remove(this.two));
 		assertFalse(this.bag.remove(this.three));
 		assertFalse(this.bag.removeAll(c));
 	}

 	public void testRetainAll() {
 		Collection<String> c = new ArrayList<String>();
 		c.add(this.one);
 		c.add(new String(this.two));
 		c.add(this.three);
 		assertTrue(this.bag.retainAll(c));
 		assertTrue(this.bag.contains(this.one));
 		assertFalse(this.bag.contains(this.two));
 		assertTrue(this.bag.contains(this.three));
 		assertFalse(this.bag.contains(this.four));
 		assertFalse(this.bag.remove(this.two));
 		assertFalse(this.bag.remove(this.four));
 		assertFalse(this.bag.retainAll(c));
 	}

 	public void testSize() {
 		assertTrue(this.bag.size() == 11);
 		String five = "five";
 		this.bag.add(five);
 		this.bag.add(five);
 		this.bag.add(five);
 		this.bag.add(five);
 		this.bag.add(new String(five));
 		assertEquals(16, this.bag.size());
 	}

 	public void testSerialization() throws Exception {
 		IdentityHashBag<String> bag2 = TestTools.serialize(this.bag);

 		assertTrue("same object?", this.bag != bag2);
 		assertEquals(11, bag2.size());
 		assertEquals(CollectionTools.bag(this.bag.iterator()), CollectionTools.bag(bag2.iterator()));
 		// look for similar elements
 		assertTrue(CollectionTools.bag(bag2.iterator()).contains(null));
 		assertTrue(CollectionTools.bag(bag2.iterator()).contains("one"));
 		assertTrue(CollectionTools.bag(bag2.iterator()).contains("two"));
 		assertTrue(CollectionTools.bag(bag2.iterator()).contains("three"));
 		assertTrue(CollectionTools.bag(bag2.iterator()).contains("four"));

 		int nullCount = 0, oneCount = 0, twoCount = 0, threeCount = 0, fourCount = 0;
 		for (String next : bag2) {
 			if (next == null)
 				nullCount++;
 			else if (next.equals("one"))
 				oneCount++;
 			else if (next.equals("two"))
 				twoCount++;
 			else if (next.equals("three"))
 				threeCount++;
 			else if (next.equals("four"))
 				fourCount++;
 		}
 		assertEquals(1, nullCount);
 		assertEquals(1, oneCount);
 		assertEquals(2, twoCount);
 		assertEquals(3, threeCount);
 		assertEquals(4, fourCount);
 	}

 	public void testToArray() {
 		Object[] a = this.bag.toArray();
 		assertEquals(11, a.length);
 		assertTrue(ArrayTools.contains(a, null));
 		assertTrue(ArrayTools.contains(a, this.one));
 		assertTrue(ArrayTools.contains(a, this.two));
 		assertTrue(ArrayTools.contains(a, this.three));
 		assertTrue(ArrayTools.contains(a, this.four));
 	}

 	public void testToArrayObjectArray() {
 		String[] a = new String[12];
 		a[11] = "not null";
 		String[] b = this.bag.toArray(a);
 		assertEquals(a, b);
 		assertEquals(12, a.length);
 		assertTrue(ArrayTools.contains(a, null));
 		assertTrue(ArrayTools.contains(a, this.one));
 		assertTrue(ArrayTools.contains(a, this.two));
 		assertTrue(ArrayTools.contains(a, this.three));
 		assertTrue(ArrayTools.contains(a, this.four));
 		assertTrue(a[11] == null);
 	}

 	public void testToString() {
 		String s = this.bag.toString();
 		assertTrue(s.startsWith("["));
 		assertTrue(s.endsWith("]"));
 		int commaCount = 0;
 		for (int i = 0; i < s.length(); i++) {
 			if (s.charAt(i) == ',') {
 				commaCount++;
 			}
 		}
 		assertEquals("invalid number of commas", 10, commaCount);
 		assertTrue(s.indexOf("one") != -1);
 		assertTrue(s.indexOf("two") != -1);
 		assertTrue(s.indexOf("three") != -1);
 		assertTrue(s.indexOf("four") != -1);
 		assertTrue(s.indexOf("null") != -1);
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2007, 2010 Oracle. All rights reserved.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v1.0, which accompanies this distribution
	* and is available at http://www.eclipse.org/legal/epl-v10.html.
	*
	* Contributors:
	* Oracle - initial API and implementation
	******************************************************************************/
	package org.eclipse.jpt.common.utility.tests.internal;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.ConcurrentModificationException;
	import java.util.Iterator;
	import java.util.NoSuchElementException;

	import junit.framework.TestCase;

	import org.eclipse.jpt.common.utility.internal.ArrayTools;
	import org.eclipse.jpt.common.utility.internal.CollectionTools;
	import org.eclipse.jpt.common.utility.internal.IdentityHashBag;
	import org.eclipse.jpt.common.utility.internal.Tools;

	@SuppressWarnings("nls")
	public class IdentityHashBagTests extends TestCase {
	private IdentityHashBag<String> bag;
	private String one = "one";
	private String two = "two";
	private String three = "three";
	private String four = "four";
	private String foo = "foo";
	private String bar = "bar";

	public IdentityHashBagTests(String name) {
	super(name);
	}

	@Override
	protected void setUp() throws Exception {
	super.setUp();
	this.bag = this.buildBag();
	}

	protected IdentityHashBag<String> buildBag() {
	IdentityHashBag<String> result = new IdentityHashBag<String>();
	result.add(null);
	result.add(this.one);
	result.add(this.two);
	result.add(this.two);
	result.add(this.three);
	result.add(this.three);
	result.add(this.three);
	result.add(this.four);
	result.add(this.four);
	result.add(this.four);
	result.add(this.four);
	return result;
	}

	@Override
	protected void tearDown() throws Exception {
	TestTools.clear(this);
	super.tearDown();
	}

	private Collection<String> buildCollection() {
	Collection<String> c = new ArrayList<String>();
	c.add(this.foo);
	c.add(this.foo);
	c.add(this.bar);
	c.add(this.bar);
	c.add(this.bar);
	return c;
	}

	public void testCtorCollection() {
	Collection<String> c = this.buildCollection();
	IdentityHashBag<String> localBag = new IdentityHashBag<String>(c);
	for (String s : c) {
	assertTrue(localBag.contains(s));
	}
	}

	public void testCtorIntFloat() {
	boolean exCaught;

	exCaught = false;
	try {
	this.bag = new IdentityHashBag<String>(-20, 0.66f);
	} catch (IllegalArgumentException ex) {
	exCaught = true;
	}
	assertTrue("IllegalArgumentException not thrown", exCaught);

	exCaught = false;
	try {
	this.bag = new IdentityHashBag<String>(20, -0.66f);
	} catch (IllegalArgumentException ex) {
	exCaught = true;
	}
	assertTrue("IllegalArgumentException not thrown", exCaught);
	}

	public void testAdd() {
	// the other adds took place in setUp
	String five = "five";
	assertTrue(this.bag.add(five));

	assertTrue(this.bag.contains(this.one));
	assertTrue(this.bag.contains(this.two));
	assertTrue(this.bag.contains(this.three));
	assertTrue(this.bag.contains(this.four));
	assertTrue(this.bag.contains(five));
	}

	public void testAddCount() {
	String minus3 = "minus3";
	String zero = "zero";
	String five = "five";
	// the other adds took place in setUp
	this.bag.add(minus3, -3);
	this.bag.add(zero, 0);
	this.bag.add(five, 5);

	assertFalse(this.bag.contains(minus3));
	assertFalse(this.bag.contains(zero));
	assertEquals(1, this.bag.count(this.one));
	assertEquals(2, this.bag.count(this.two));
	assertEquals(3, this.bag.count(this.three));
	assertEquals(4, this.bag.count(this.four));
	assertEquals(5, this.bag.count(five));

	this.bag.add(this.three, 2);
	assertEquals(5, this.bag.count(this.three));
	}

	public void testAddAll() {
	Collection<String> c = this.buildCollection();
	assertTrue(this.bag.addAll(c));
	for (String s : c) {
	assertTrue(this.bag.contains(s));
	}
	}

	public void testClear() {
	assertTrue(this.bag.contains(this.one));
	assertTrue(this.bag.contains(this.two));
	assertTrue(this.bag.contains(this.three));
	assertTrue(this.bag.contains(this.four));
	assertTrue(this.bag.contains(null));
	assertEquals(11, this.bag.size());
	this.bag.clear();
	assertFalse(this.bag.contains(this.one));
	assertFalse(this.bag.contains(this.two));
	assertFalse(this.bag.contains(this.three));
	assertFalse(this.bag.contains(this.four));
	assertFalse(this.bag.contains(null));
	assertEquals(0, this.bag.size());
	}

	public void testClone() {
	IdentityHashBag<String> bag2 = this.bag.clone();
	assertTrue("bad clone", this.bag != bag2);
	assertEquals("bad clone", this.bag, bag2);
	assertTrue("bad clone", this.bag.hashCode() == bag2.hashCode());
	}

	public void testContains() {
	assertTrue(this.bag.contains(null));
	assertTrue(this.bag.contains(this.one));
	assertTrue(this.bag.contains(this.two));
	assertTrue(this.bag.contains(this.three));
	assertTrue(this.bag.contains(this.four));

	assertFalse(this.bag.contains(new String("four")));
	assertFalse(this.bag.contains("five"));
	}

	public void testContainsAll() {
	Collection<String> c = new ArrayList<String>();
	c.add(null);
	c.add(this.one);
	c.add(this.two);
	c.add(this.three);
	c.add(this.four);
	assertTrue(this.bag.containsAll(c));
	c.add(new String(this.four));
	assertFalse(this.bag.containsAll(c));
	}

	public void testCount() {
	assertEquals(0, this.bag.count("zero"));
	assertEquals(1, this.bag.count("one"));
	assertEquals(2, this.bag.count("two"));
	assertEquals(3, this.bag.count("three"));
	assertEquals(4, this.bag.count("four"));
	assertEquals(0, this.bag.count("five"));
	}

	public void testEquals() {
	IdentityHashBag<String> bag2 = this.buildBag();
	assertEquals(this.bag, bag2);
	bag2.add("five");
	assertFalse(this.bag.equals(bag2));
	Collection<String> c = new ArrayList<String>(this.bag);
	assertFalse(this.bag.equals(c));
	}

	public void testHashCode() {
	IdentityHashBag<String> bag2 = this.buildBag();
	assertEquals(this.bag.hashCode(), bag2.hashCode());
	}

	public void testIsEmpty() {
	assertFalse(this.bag.isEmpty());
	this.bag.clear();
	assertTrue(this.bag.isEmpty());
	this.bag.add("foo");
	assertFalse(this.bag.isEmpty());
	}

	public void testEmptyIterator() {
	this.bag.clear();
	Iterator<String> iterator = this.bag.iterator();
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue("NoSuchElementException not thrown: " + element, exCaught);

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue("IllegalStateException not thrown", exCaught);
	}

	public void testIterator() {
	int i = 0;
	Iterator<String> iterator = this.bag.iterator();
	assertTrue(iterator.hasNext());
	while (iterator.hasNext()) {
	iterator.next();
	i++;
	}
	assertEquals(11, i);
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue("NoSuchElementException not thrown: " + element, exCaught);

	iterator.remove();
	assertEquals(10, this.bag.size());

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue("IllegalStateException not thrown", exCaught);

	// start over
	iterator = this.bag.iterator();
	this.bag.add("five");
	exCaught = false;
	try {
	iterator.next();
	} catch (ConcurrentModificationException ex) {
	exCaught = true;
	}
	assertTrue("ConcurrentModificationException not thrown", exCaught);
	}

	public void testUniqueIterator() {
	int i = 0;
	Iterator<String> iterator = this.bag.uniqueIterator();
	assertTrue(iterator.hasNext());
	while (iterator.hasNext()) {
	iterator.next();
	i++;
	}
	assertEquals(5, i);
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	fail(element.toString());
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.uniqueIterator();
	Object next = null;
	while (iterator.hasNext() && !this.four.equals(next)) {
	next = iterator.next();
	}
	iterator.remove();
	assertEquals(7, this.bag.size());

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.uniqueIterator();
	String five = "five";
	this.bag.add(five);
	exCaught = false;
	try {
	iterator.next();
	} catch (ConcurrentModificationException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testEntries() {
	int i = 0;
	Iterator<org.eclipse.jpt.common.utility.internal.Bag.Entry<String>> iterator = this.bag.entries();
	assertTrue(iterator.hasNext());
	while (iterator.hasNext()) {
	iterator.next();
	i++;
	}
	assertEquals(5, i);
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	fail(element.toString());
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.entries();
	org.eclipse.jpt.common.utility.internal.Bag.Entry<String> next = null;
	while (iterator.hasNext()) {
	next = iterator.next();
	if (next.getElement().equals(this.four)) {
	iterator.remove();
	break;
	}
	}
	assertEquals(7, this.bag.size());

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.entries();
	String five = "five";
	this.bag.add(five);
	exCaught = false;
	try {
	iterator.next();
	} catch (ConcurrentModificationException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testHashingDistribution() throws Exception {
	IdentityHashBag<String> bigBag = new IdentityHashBag<String>();
	for (int i = 0; i < 10000; i++) {
	bigBag.add("object" + i);
	}

	java.lang.reflect.Field field = bigBag.getClass().getDeclaredField("table");
	field.setAccessible(true);
	Object[] table = (Object[]) field.get(bigBag);
	int bucketCount = table.length;
	int filledBucketCount = 0;
	for (int i = 0; i < bucketCount; i++) {
	if (table[i] != null) {
	filledBucketCount++;
	}
	}
	float loadFactor = ((float) filledBucketCount) / ((float) bucketCount);
	if ((loadFactor < 0.20) \|\| (loadFactor > 0.80)) {
	String msg = "poor load factor: " + loadFactor;
	if (Tools.jvmIsSun()) {
	fail(msg);
	} else {
	// poor load factor is seen in the Eclipse build environment for some reason...
	System.out.println(this.getClass().getName() + '.' + this.getName() + " - " + msg);
	TestTools.printSystemProperties();
	}
	}
	}

	public void testRemove() {
	assertTrue(this.bag.remove(this.one));
	assertFalse(this.bag.contains(this.one));
	assertFalse(this.bag.remove(this.one));

	assertTrue(this.bag.remove(this.two));
	assertTrue(this.bag.remove(this.two));
	assertFalse(this.bag.contains(this.two));
	assertFalse(this.bag.remove(this.two));

	assertFalse(this.bag.remove(new String(this.three)));
	}

	public void testRemoveCount() {
	assertFalse(this.bag.remove(this.one, 0));
	assertTrue(this.bag.contains(this.one));

	assertTrue(this.bag.remove(this.one, 1));
	assertFalse(this.bag.contains(this.one));
	assertFalse(this.bag.remove(this.one));

	assertFalse(this.bag.remove(this.two, -3));
	assertTrue(this.bag.remove(this.two, 1));
	assertTrue(this.bag.contains(this.two));

	assertTrue(this.bag.remove(this.two, 1));
	assertFalse(this.bag.contains(this.two));
	assertFalse(this.bag.remove(this.two));

	assertTrue(this.bag.remove(this.three, 3));
	assertFalse(this.bag.contains(this.three));
	assertFalse(this.bag.remove(this.three));
	}

	public void testRemoveAll() {
	Collection<String> c = new ArrayList<String>();
	c.add(this.one);
	c.add(new String(this.two));
	c.add(this.three);
	assertTrue(this.bag.removeAll(c));
	assertFalse(this.bag.contains(this.one));
	assertTrue(this.bag.contains(this.two));
	assertFalse(this.bag.contains(this.three));
	assertFalse(this.bag.remove(this.one));
	assertTrue(this.bag.remove(this.two));
	assertFalse(this.bag.remove(this.three));
	assertFalse(this.bag.removeAll(c));
	}

	public void testRetainAll() {
	Collection<String> c = new ArrayList<String>();
	c.add(this.one);
	c.add(new String(this.two));
	c.add(this.three);
	assertTrue(this.bag.retainAll(c));
	assertTrue(this.bag.contains(this.one));
	assertFalse(this.bag.contains(this.two));
	assertTrue(this.bag.contains(this.three));
	assertFalse(this.bag.contains(this.four));
	assertFalse(this.bag.remove(this.two));
	assertFalse(this.bag.remove(this.four));
	assertFalse(this.bag.retainAll(c));
	}

	public void testSize() {
	assertTrue(this.bag.size() == 11);
	String five = "five";
	this.bag.add(five);
	this.bag.add(five);
	this.bag.add(five);
	this.bag.add(five);
	this.bag.add(new String(five));
	assertEquals(16, this.bag.size());
	}

	public void testSerialization() throws Exception {
	IdentityHashBag<String> bag2 = TestTools.serialize(this.bag);

	assertTrue("same object?", this.bag != bag2);
	assertEquals(11, bag2.size());
	assertEquals(CollectionTools.bag(this.bag.iterator()), CollectionTools.bag(bag2.iterator()));
	// look for similar elements
	assertTrue(CollectionTools.bag(bag2.iterator()).contains(null));
	assertTrue(CollectionTools.bag(bag2.iterator()).contains("one"));
	assertTrue(CollectionTools.bag(bag2.iterator()).contains("two"));
	assertTrue(CollectionTools.bag(bag2.iterator()).contains("three"));
	assertTrue(CollectionTools.bag(bag2.iterator()).contains("four"));

	int nullCount = 0, oneCount = 0, twoCount = 0, threeCount = 0, fourCount = 0;
	for (String next : bag2) {
	if (next == null)
	nullCount++;
	else if (next.equals("one"))
	oneCount++;
	else if (next.equals("two"))
	twoCount++;
	else if (next.equals("three"))
	threeCount++;
	else if (next.equals("four"))
	fourCount++;
	}
	assertEquals(1, nullCount);
	assertEquals(1, oneCount);
	assertEquals(2, twoCount);
	assertEquals(3, threeCount);
	assertEquals(4, fourCount);
	}

	public void testToArray() {
	Object[] a = this.bag.toArray();
	assertEquals(11, a.length);
	assertTrue(ArrayTools.contains(a, null));
	assertTrue(ArrayTools.contains(a, this.one));
	assertTrue(ArrayTools.contains(a, this.two));
	assertTrue(ArrayTools.contains(a, this.three));
	assertTrue(ArrayTools.contains(a, this.four));
	}

	public void testToArrayObjectArray() {
	String[] a = new String[12];
	a[11] = "not null";
	String[] b = this.bag.toArray(a);
	assertEquals(a, b);
	assertEquals(12, a.length);
	assertTrue(ArrayTools.contains(a, null));
	assertTrue(ArrayTools.contains(a, this.one));
	assertTrue(ArrayTools.contains(a, this.two));
	assertTrue(ArrayTools.contains(a, this.three));
	assertTrue(ArrayTools.contains(a, this.four));
	assertTrue(a[11] == null);
	}

	public void testToString() {
	String s = this.bag.toString();
	assertTrue(s.startsWith("["));
	assertTrue(s.endsWith("]"));
	int commaCount = 0;
	for (int i = 0; i < s.length(); i++) {
	if (s.charAt(i) == ',') {
	commaCount++;
	}
	}
	assertEquals("invalid number of commas", 10, commaCount);
	assertTrue(s.indexOf("one") != -1);
	assertTrue(s.indexOf("two") != -1);
	assertTrue(s.indexOf("three") != -1);
	assertTrue(s.indexOf("four") != -1);
	assertTrue(s.indexOf("null") != -1);
	}

	}