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/*******************************************************************************
* Copyright (c) 2005, 2007 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.utility.tests.internal.iterators;
import java.util.AbstractCollection;
import java.util.AbstractList;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Vector;
import junit.framework.TestCase;
import org.eclipse.jpt.utility.internal.iterators.ChainIterator;
public class ChainIteratorTests extends TestCase {
private final static Class<?>[] VECTOR_HIERARCHY = { Vector.class, AbstractList.class, AbstractCollection.class, Object.class };
public ChainIteratorTests(String name) {
super(name);
}
public void testHasNext() {
int i = 0;
for (Iterator<Class<?>> stream = this.buildIterator(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(VECTOR_HIERARCHY.length, i);
}
public void testInnerHasNext() {
int i = 0;
for (Iterator<Class<?>> stream = this.buildInnerIterator(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(VECTOR_HIERARCHY.length, i);
}
public void testNext() {
int i = 0;
for (Iterator<Class<?>> stream = this.buildIterator(); stream.hasNext(); i++) {
assertEquals("bogus link", VECTOR_HIERARCHY[i], stream.next());
}
}
public void testInnerNext() {
int i = 0;
for (Iterator<Class<?>> stream = this.buildInnerIterator(); stream.hasNext(); i++) {
assertEquals("bogus link", VECTOR_HIERARCHY[i], stream.next());
}
}
public void testNoSuchElementException() {
boolean exCaught = false;
Iterator<Class<?>> stream = this.buildIterator();
Class<?> javaClass = null;
while (stream.hasNext()) {
javaClass = stream.next();
}
try {
javaClass = stream.next();
} catch (NoSuchElementException ex) {
exCaught = true;
}
assertTrue("NoSuchElementException not thrown: " + javaClass, exCaught);
}
public void testUnsupportedOperationException() {
boolean exCaught = false;
for (Iterator<Class<?>> stream = this.buildIterator(); stream.hasNext();) {
if (stream.next() == AbstractCollection.class) {
try {
stream.remove();
} catch (UnsupportedOperationException ex) {
exCaught = true;
}
}
}
assertTrue("UnsupportedOperationException not thrown", exCaught);
}
private Iterator<Class<?>> buildIterator() {
return this.buildChainIterator(Vector.class, this.buildLinker());
}
private Iterator<Class<?>> buildInnerIterator() {
return this.buildInnerChainIterator(Vector.class);
}
private Iterator<Class<?>> buildChainIterator(Class<?> startLink, ChainIterator.Linker<Class<?>> linker) {
return new ChainIterator<Class<?>>(startLink, linker);
}
private ChainIterator.Linker<Class<?>> buildLinker() {
// chain up the class's hierarchy
return new ChainIterator.Linker<Class<?>>() {
public Class<?> nextLink(Class<?> currentLink) {
return currentLink.getSuperclass();
}
};
}
private Iterator<Class<?>> buildInnerChainIterator(Class<?> startLink) {
// chain up the class's hierarchy
return new ChainIterator<Class<?>>(startLink) {
@Override
protected Class<?> nextLink(Class<?> currentLink) {
return currentLink.getSuperclass();
}
};
}
}
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