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/*******************************************************************************
* Copyright (c) 2004, 2012 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
/*
* Created on Jul 19, 2004
*/
package org.eclipse.cdt.core.parser.tests;
import java.util.Random;
import org.eclipse.cdt.core.parser.util.CharArrayObjectMap;
import org.eclipse.cdt.core.parser.util.ObjectMap;
import junit.framework.TestCase;
/**
* @author aniefer
*/
public class ObjectMapTest extends TestCase {
private static class HashObject {
final public int hash;
HashObject(int h) {
hash = h;
}
@Override
public int hashCode() {
return hash;
}
}
public void insertContents(ObjectMap map, Object[][] contents) throws Exception {
for (int i = 0; i < contents.length; i++) {
map.put(contents[i][0], contents[i][1]);
}
}
public void assertContents(ObjectMap map, Object[][] contents) throws Exception {
for (int i = 0; i < contents.length; i++) {
assertEquals(map.keyAt(i), contents[i][0]);
assertEquals(map.getAt(i), contents[i][1]);
assertEquals(map.get(contents[i][0]), contents[i][1]);
}
assertEquals(map.size(), contents.length);
}
public void testSimpleAdd() throws Exception{
ObjectMap map = new ObjectMap(2);
Object[][] contents = new Object[][] { {"1", "ob" } };
insertContents(map, contents);
assertContents(map, contents);
assertEquals(map.size(), 1);
assertEquals(map.capacity(), 8);
}
public void testSimpleCollision() throws Exception{
ObjectMap map = new ObjectMap(2);
HashObject key1 = new HashObject(1);
HashObject key2 = new HashObject(1);
Object[][] contents = new Object[][] { {key1, "1" },
{key2, "2" } };
insertContents(map, contents);
assertEquals(map.size(), 2);
assertEquals(map.capacity(), 8);
assertContents(map, contents);
}
public void testResize() throws Exception{
ObjectMap map = new ObjectMap(1);
assertEquals(map.size(), 0);
assertEquals(map.capacity(), 8);
Object[][] res = new Object[][] { { "0", "o0" },
{ "1", "o1" },
{ "2", "o2" },
{ "3", "o3" },
{ "4", "o4" } };
insertContents(map, res);
assertEquals(map.capacity(), 8);
assertContents(map, res);
}
public void testCollisionResize() throws Exception{
ObjectMap map = new ObjectMap(1);
assertEquals(map.size(), 0);
assertEquals(map.capacity(), 8);
Object[][] res = new Object[][] { { new HashObject(0), "o0" },
{ new HashObject(1), "o1" },
{ new HashObject(0), "o2" },
{ new HashObject(1), "o3" },
{ new HashObject(0), "o4" } };
insertContents(map, res);
assertEquals(map.capacity(), 8);
assertContents(map, res);
}
public void testReAdd() throws Exception{
ObjectMap map = new ObjectMap(1);
assertEquals(map.size(), 0);
assertEquals(map.capacity(), 8);
Object[][] res = new Object[][] { { "0", "o0" },
{ "1", "o1" } };
insertContents(map, res);
assertEquals(map.capacity(), 8);
assertContents(map, res);
res = new Object[][]{ { "0", "o00" },
{ "1", "o01" },
{ "10", "o10" },
{ "11", "o11" } };
insertContents(map, res);
assertContents(map, res);
}
public void testMapAdd() {
CharArrayObjectMap map = new CharArrayObjectMap(4);
char[] key1 = "key1".toCharArray();
Object value1 = new Integer(43);
map.put(key1, value1);
char[] key2 = "key1".toCharArray();
Object value2 = map.get(key2);
assertEquals(value1, value2);
for (int i = 0; i < 25; ++i) {
map.put(("ikey" + i).toCharArray(), new Integer(i));
}
for (int i = 0; i < 25; ++i) {
Object ivalue1 = map.get(("ikey" + i).toCharArray());
assertEquals(i, ivalue1);
}
}
public void testCollisionRatio() {
Random random = new Random(239);
CharArrayObjectMap map = new CharArrayObjectMap(1);
for (int i = 0; i < 20000; i++) {
int r = random.nextInt();
map.put(("key" + Integer.toUnsignedString(i)).toCharArray(), i);
double collisionRatio = (double) map.countCollisions() / map.size();
assertTrue(String.format("Collision ratio %.3f is unexpectedly high for map size of %d.", collisionRatio, map.size()),
collisionRatio <= 0.4);
}
}
}
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