/*******************************************************************************
* 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.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import junit.framework.TestCase;
import org.eclipse.jpt.utility.internal.Transformer;
import org.eclipse.jpt.utility.internal.iterators.TransformationListIterator;
@SuppressWarnings("nls")
public class TransformationListIteratorTests extends TestCase {
public TransformationListIteratorTests(String name) {
super(name);
}
public void testHasNextAndHasPrevious() {
int i = 0;
ListIterator<Integer> stream = this.buildIterator();
while (stream.hasNext()) {
stream.next();
i++;
}
assertEquals(8, i);
while (stream.hasPrevious()) {
stream.previous();
i--;
}
assertEquals(0, i);
}
public void testHasNextAndHasPreviousUpcast() {
int i = 0;
ListIterator<Object> stream = this.buildIteratorUpcast();
while (stream.hasNext()) {
stream.next();
i++;
}
assertEquals(8, i);
while (stream.hasPrevious()) {
stream.previous();
i--;
}
assertEquals(0, i);
}
public void testInnerHasNextAndHasPrevious() {
int i = 0;
ListIterator<Integer> stream = this.buildInnerIterator();
while (stream.hasNext()) {
stream.next();
i++;
}
assertEquals(8, i);
while (stream.hasPrevious()) {
stream.previous();
i--;
}
assertEquals(0, i);
}
public void testNextAndPrevious() {
int i = 0;
ListIterator<Integer> stream = this.buildIterator();
while (stream.hasNext()) {
assertEquals(++i, stream.next().intValue());
}
++i;
while (stream.hasPrevious()) {
assertEquals(--i, stream.previous().intValue());
}
}
public void testInnerNextAndPrevious() {
int i = 0;
ListIterator<Integer> stream = this.buildInnerIterator();
while (stream.hasNext()) {
assertEquals(++i, stream.next().intValue());
}
++i;
while (stream.hasPrevious()) {
assertEquals(--i, stream.previous().intValue());
}
}
public void testNextIndexAndPreviousIndex() {
int i = -1;
ListIterator<Integer> stream = this.buildIterator();
while (stream.hasNext()) {
assertEquals(++i, stream.nextIndex());
stream.next();
}
++i;
while (stream.hasPrevious()) {
assertEquals(--i, stream.previousIndex());
stream.previous();
}
}
public void testInnerNextIndexAndPreviousIndex() {
int i = -1;
ListIterator<Integer> stream = this.buildInnerIterator();
while (stream.hasNext()) {
assertEquals(++i, stream.nextIndex());
stream.next();
}
++i;
while (stream.hasPrevious()) {
assertEquals(--i, stream.previousIndex());
stream.previous();
}
}
public void testRemove() {
List<String> l = this.buildList();
for (ListIterator<Integer> stream = this.buildInnerTransformationListIterator(l.listIterator()); stream.hasNext();) {
if (stream.next().intValue() == 3) {
stream.remove();
}
}
assertEquals("nothing removed", this.buildList().size() - 1, l.size());
assertFalse("element still in list", l.contains("333"));
assertTrue("wrong element removed", l.contains("22"));
}
public void testInnerRemove() {
List<String> l = this.buildList();
for (ListIterator<Integer> stream = this.buildTransformationListIterator(l.listIterator(), this.buildTransformer()); stream.hasNext();) {
if (stream.next().intValue() == 3) {
stream.remove();
}
}
assertEquals("nothing removed", this.buildList().size() - 1, l.size());
assertFalse("element still in list", l.contains("333"));
assertTrue("wrong element removed", l.contains("22"));
}
public void testUnsupportedOperationExceptionOnAdd() {
ListIterator<Integer> stream = this.buildIterator();
boolean exCaught = false;
try {
stream.add(new Integer(0));
fail("exception not thrown");
} catch (UnsupportedOperationException e) {
exCaught = true;
}
assertTrue(exCaught);
}
public void testUnsupportedOperationExceptionOnSet() {
ListIterator<Integer> stream = this.buildIterator();
boolean exCaught = false;
try {
stream.set(new Integer(0));
fail("exception not thrown");
} catch (UnsupportedOperationException e) {
exCaught = true;
}
assertTrue(exCaught);
}
public void testNoSuchElementException() {
boolean exCaught = false;
ListIterator<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 ListIterator<Integer> buildIterator() {
return this.buildTransformationListIterator(this.buildNestedIterator(), this.buildTransformer());
}
private ListIterator<Object> buildIteratorUpcast() {
return this.buildTransformationListIteratorUpcast(this.buildNestedIterator(), this.buildTransformerUpcast());
}
private ListIterator<Integer> buildInnerIterator() {
return this.buildInnerTransformationListIterator(this.buildNestedIterator());
}
private ListIterator<Integer> buildUnmodifiableIterator() {
return this.buildTransformationListIterator(this.buildUnmodifiableNestedIterator(), this.buildTransformer());
}
private ListIterator<Integer> buildTransformationListIterator(ListIterator<String> nestedIterator, Transformer<String, Integer> transformer) {
return new TransformationListIterator<String, Integer>(nestedIterator, transformer);
}
private ListIterator<Object> buildTransformationListIteratorUpcast(ListIterator<String> nestedIterator, Transformer<Object, Integer> transformer) {
return new TransformationListIterator<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 ListIterator<Integer> buildInnerTransformationListIterator(ListIterator<String> nestedIterator) {
// transform each string into an integer with a value of the string's length
return new TransformationListIterator<String, Integer>(nestedIterator) {
@Override
protected Integer transform(String next) {
return new Integer(next.length());
}
};
}
private ListIterator<String> buildNestedIterator() {
return this.buildList().listIterator();
}
private ListIterator<String> buildUnmodifiableNestedIterator() {
return this.buildUnmodifiableList().listIterator();
}
private List<String> buildList() {
List<String> l = new ArrayList<String>();
l.add("1");
l.add("22");
l.add("333");
l.add("4444");
l.add("55555");
l.add("666666");
l.add("7777777");
l.add("88888888");
return l;
}
private List<String> buildUnmodifiableList() {
return Collections.unmodifiableList(this.buildList());
}
public void testInvalidTransformationListIterator() {
// missing method override
Iterator<Integer> iterator = new TransformationListIterator<String, Integer>(this.buildList().listIterator());
boolean exCaught = false;
try {
Integer integer = iterator.next();
fail("invalid integer: " + integer);
} catch (UnsupportedOperationException ex) {
exCaught = true;
}
assertTrue("NoSuchElementException not thrown", exCaught);
}
}
