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/*******************************************************************************
* Copyright (c) 2005, 2009 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.iterators;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import junit.framework.TestCase;
import org.eclipse.jpt.common.utility.internal.iterators.PeekableIterator;
@SuppressWarnings("nls")
public class PeekableIteratorTests extends TestCase {
public PeekableIteratorTests(String name) {
super(name);
}
public void testUnsupportedOperationException() {
boolean exCaught = false;
for (Iterator<String> stream = this.buildPeekableIterator(); stream.hasNext();) {
String string = stream.next();
if (string.equals("three")) {
try {
stream.remove();
} catch (UnsupportedOperationException ex) {
exCaught = true;
}
}
}
assertTrue("UnsupportedOperationException not thrown", exCaught);
}
public void testNoSuchElementException() {
boolean exCaught = false;
Iterator<String> stream = this.buildPeekableIterator();
String string = null;
while (stream.hasNext()) {
string = stream.next();
}
try {
string = stream.next();
} catch (NoSuchElementException ex) {
exCaught = true;
}
assertTrue("NoSuchElementException not thrown: " + string, exCaught);
}
public void testHasNext() {
int i = 0;
for (Iterator<String> stream = this.buildPeekableIterator(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(6, i);
}
public void testHasNextUpcast() {
int i = 0;
for (Iterator<Object> stream = this.buildPeekableIteratorUpcast(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(6, i);
}
public void testNext() {
Iterator<String> stream = this.buildPeekableIterator();
assertEquals("zero", stream.next());
assertEquals("one", stream.next());
assertEquals("two", stream.next());
assertEquals("three", stream.next());
assertEquals("four", stream.next());
assertEquals("five", stream.next());
}
public void testNextUpcast() {
Iterator<Object> stream = this.buildPeekableIteratorUpcast();
assertEquals("zero", stream.next());
assertEquals("one", stream.next());
assertEquals("two", stream.next());
assertEquals("three", stream.next());
assertEquals("four", stream.next());
assertEquals("five", stream.next());
}
public void testPeek() {
Object next = null;
for (PeekableIterator<String> stream = this.buildPeekableIterator(); stream.hasNext();) {
Object peek = stream.peek();
assertTrue("peek and next are prematurely identical", peek != next);
next = stream.next();
assertTrue("peek and next are not identical", peek == next);
}
}
public void testPeekUpcast() {
Object next = null;
for (PeekableIterator<Object> stream = this.buildPeekableIteratorUpcast(); stream.hasNext();) {
Object peek = stream.peek();
assertTrue("peek and next are prematurely identical", peek != next);
next = stream.next();
assertTrue("peek and next are not identical", peek == next);
}
}
private PeekableIterator<String> buildPeekableIterator() {
return this.buildPeekableIterator(this.buildNestedIterator());
}
private PeekableIterator<Object> buildPeekableIteratorUpcast() {
return this.buildPeekableIteratorUpcast(this.buildNestedIterator());
}
private PeekableIterator<String> buildPeekableIterator(Iterator<String> nestedIterator) {
return new PeekableIterator<String>(nestedIterator);
}
private PeekableIterator<Object> buildPeekableIteratorUpcast(Iterator<String> nestedIterator) {
return new PeekableIterator<Object>(nestedIterator);
}
private Iterator<String> buildNestedIterator() {
Collection<String> c = new ArrayList<String>();
c.add("zero");
c.add("one");
c.add("two");
c.add("three");
c.add("four");
c.add("five");
return c.iterator();
}
}
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