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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.utility.tests.internal.iterators;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import junit.framework.TestCase;
import org.eclipse.jpt.utility.internal.Transformer;
import org.eclipse.jpt.utility.internal.iterators.TransformationIterator;
@SuppressWarnings("nls")
public class TransformationIteratorTests extends TestCase {
public TransformationIteratorTests(String name) {
super(name);
}
public void testHasNext() {
int i = 0;
for (Iterator<Integer> stream = this.buildIterator(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(8, i);
}
public void testHasNextUpcast() {
int i = 0;
for (Iterator<Object> stream = this.buildIteratorUpcast(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(8, i);
}
public void testInnerHasNext() {
int i = 0;
for (Iterator<Integer> stream = this.buildInnerIterator(); stream.hasNext();) {
stream.next();
i++;
}
assertEquals(8, i);
}
public void testNext() {
int i = 0;
for (Iterator<Integer> stream = this.buildIterator(); stream.hasNext();) {
assertEquals("bogus transformation", ++i, stream.next().intValue());
}
}
public void testNextUpcast() {
int i = 0;
for (Iterator<Object> stream = this.buildIteratorUpcast(); stream.hasNext();) {
assertEquals("bogus transformation", ++i, ((Integer) stream.next()).intValue());
}
}
public void testInnerNext() {
int i = 0;
for (Iterator<Integer> stream = this.buildInnerIterator(); stream.hasNext();) {
assertEquals("bogus transformation", ++i, stream.next().intValue());
}
}
public void testRemove() {
Collection<String> c = this.buildCollection();
for (Iterator<Integer> stream = this.buildInnerTransformationIterator(c.iterator()); stream.hasNext();) {
if (stream.next().intValue() == 3) {
stream.remove();
}
}
assertEquals("nothing removed", this.buildCollection().size() - 1, c.size());
assertFalse("element still in collection", c.contains("333"));
assertTrue("wrong element removed", c.contains("22"));
}
public void testInnerRemove() {
Collection<String> c = this.buildCollection();
for (Iterator<Integer> stream = this.buildTransformationIterator(c.iterator(), this.buildTransformer()); stream.hasNext();) {
if (stream.next().intValue() == 3) {
stream.remove();
}
}
assertEquals("nothing removed", this.buildCollection().size() - 1, c.size());
assertFalse("element still in collection", c.contains("333"));
assertTrue("wrong element removed", c.contains("22"));
}
public void testNoSuchElementException() {
boolean exCaught = false;
Iterator<Integer> stream = this.buildIterator();
Integer integer = null;
while (stream.hasNext()) {
integer = stream.next();
}
try {
integer = stream.next();
} catch (NoSuchElementException ex) {
exCaught = true;
}
assertTrue("NoSuchElementException not thrown: " + integer, exCaught);
}
public void testUnsupportedOperationException() {
boolean exCaught = false;
for (Iterator<Integer> stream = this.buildUnmodifiableIterator(); stream.hasNext();) {
int i = stream.next().intValue();
if (i == 3) {
try {
stream.remove();
} catch (UnsupportedOperationException ex) {
exCaught = true;
}
}
}
assertTrue("UnsupportedOperationException not thrown", exCaught);
}
public void testIllegalStateException() {
boolean exCaught = false;
try {
this.buildIterator().remove();
} catch (IllegalStateException ex) {
exCaught = true;
}
assertTrue("IllegalStateException not thrown", exCaught);
}
private Iterator<Integer> buildIterator() {
return this.buildTransformationIterator(this.buildNestedIterator(), this.buildTransformer());
}
private Iterator<Object> buildIteratorUpcast() {
return this.buildTransformationIteratorUpcast(this.buildNestedIterator(), this.buildTransformerUpcast());
}
private Iterator<Integer> buildInnerIterator() {
return this.buildInnerTransformationIterator(this.buildNestedIterator());
}
private Iterator<Integer> buildUnmodifiableIterator() {
return this.buildTransformationIterator(this.buildUnmodifiableNestedIterator(), this.buildTransformer());
}
private Iterator<Integer> buildTransformationIterator(Iterator<String> nestedIterator, Transformer<String, Integer> transformer) {
return new TransformationIterator<String, Integer>(nestedIterator, transformer);
}
private Iterator<Object> buildTransformationIteratorUpcast(Iterator<String> nestedIterator, Transformer<Object, Integer> transformer) {
return new TransformationIterator<Object, Object>(nestedIterator, transformer);
}
private Transformer<String, Integer> buildTransformer() {
// transform each string into an integer with a value of the string's length
return new Transformer<String, Integer>() {
public Integer transform(String next) {
return new Integer(next.length());
}
};
}
private Transformer<Object, Integer> buildTransformerUpcast() {
// transform each string into an integer with a value of the string's length
return new Transformer<Object, Integer>() {
public Integer transform(Object next) {
return new Integer(((String) next).length());
}
};
}
private Iterator<Integer> buildInnerTransformationIterator(Iterator<String> nestedIterator) {
// transform each string into an integer with a value of the string's length
return new TransformationIterator<String, Integer>(nestedIterator) {
@Override
protected Integer transform(String next) {
return new Integer(next.length());
}
};
}
private Iterator<String> buildNestedIterator() {
return this.buildCollection().iterator();
}
private Iterator<String> buildUnmodifiableNestedIterator() {
return this.buildUnmodifiableCollection().iterator();
}
private Collection<String> buildCollection() {
Collection<String> c = new ArrayList<String>();
c.add("1");
c.add("22");
c.add("333");
c.add("4444");
c.add("55555");
c.add("666666");
c.add("7777777");
c.add("88888888");
return c;
}
private Collection<String> buildUnmodifiableCollection() {
return Collections.unmodifiableCollection(this.buildCollection());
}
public void testInvalidTransformationIterator() {
// missing method override
Iterator<Integer> iterator = new TransformationIterator<String, Integer>(this.buildCollection().iterator());
boolean exCaught = false;
try {
Integer integer = iterator.next();
fail("invalid integer: " + integer);
} catch (UnsupportedOperationException ex) {
exCaught = true;
}
assertTrue("NoSuchElementException not thrown", exCaught);
}
}
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