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/*******************************************************************************
* Copyright (c) 2005, 2013 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.comparator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import junit.framework.TestCase;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.internal.comparator.ComparatorTools;
import org.eclipse.jpt.common.utility.internal.comparator.ReverseComparator;
import org.eclipse.jpt.common.utility.tests.internal.TestTools;
@SuppressWarnings("nls")
public class ReverseComparatorTests
extends TestCase
{
private Comparator<String> naturalReverseComparator;
private Comparator<String> customComparator;
private Comparator<String> customReverseComparator;
public ReverseComparatorTests(String name) {
super(name);
}
@Override
protected void setUp() throws Exception {
super.setUp();
this.naturalReverseComparator = ComparatorTools.reverseComparator();
this.customComparator = this.buildCustomComparator();
this.customReverseComparator = new ReverseComparator<String>(this.customComparator);
}
private Comparator<String> buildCustomComparator() {
return new Comparator<String>() {
public int compare(String s1, String s2) {
String lower1 = s1.toLowerCase();
String lower2 = s2.toLowerCase();
int result = lower1.compareTo(lower2);
if (result == 0) {
return s1.compareTo(s2); // use case to differentiate "equal" strings
}
return result;
}
};
}
private List<String> buildUnsortedList() {
List<String> result = new ArrayList<String>();
result.add("T");
result.add("Z");
result.add("Y");
result.add("M");
result.add("m");
result.add("a");
result.add("B");
result.add("b");
result.add("A");
return result;
}
private List<String> buildNaturallySortedList() {
List<String> result = new ArrayList<String>(this.buildUnsortedList());
Collections.sort(result);
return result;
}
private List<String> buildCustomSortedList() {
List<String> result = new ArrayList<String>(this.buildUnsortedList());
Collections.sort(result, this.customComparator);
return result;
}
@Override
protected void tearDown() throws Exception {
TestTools.clear(this);
super.tearDown();
}
public void testNatural() {
List<String> list = this.buildUnsortedList();
Collections.sort(list, this.naturalReverseComparator);
this.verifyList(this.buildNaturallySortedList(), list);
}
public void testCustom() {
List<String> list = this.buildUnsortedList();
Collections.sort(list, this.customReverseComparator);
this.verifyList(this.buildCustomSortedList(), list);
}
public void testCustom_nonComparable() {
List<Foo> list = this.buildUnsortedFooList();
Collections.sort(list, new ReverseComparator<Foo>(Foo.COMPARATOR));
this.verifyList(this.buildSortedFooList(), list);
}
private List<Foo> buildUnsortedFooList() {
List<Foo> result = new ArrayList<Foo>();
result.add(new Foo("T"));
result.add(new Foo("Z"));
result.add(new Foo("Y"));
result.add(new Foo("M"));
result.add(new Foo("m"));
result.add(new Foo("a"));
result.add(new Foo("B"));
result.add(new Foo("b"));
result.add(new Foo("A"));
return result;
}
private List<Foo> buildSortedFooList() {
List<Foo> result = new ArrayList<Foo>(this.buildUnsortedFooList());
Collections.sort(result, Foo.COMPARATOR);
return result;
}
private <T> void verifyList(List<T> normal, List<T> reverse) {
int size = normal.size();
int max = size - 1;
for (int i = 0; i < size; i++) {
assertEquals(normal.get(i), reverse.get(max - i));
}
}
public static class Foo {
public final String string;
public Foo(String string) {
super();
this.string = string;
}
@Override
public boolean equals(Object o) {
return (o instanceof Foo) && this.string.equals(((Foo) o).string);
}
@Override
public int hashCode() {
return this.string.hashCode();
}
@Override
public String toString() {
return ObjectTools.toString(this, this.string);
}
public static final Comparator<Foo> COMPARATOR = new FooComparator();
public static class FooComparator
implements Comparator<Foo>
{
public int compare(Foo foo1, Foo foo2) {
String s1 = foo1.string;
String s2 = foo2.string;
String lower1 = s1.toLowerCase();
String lower2 = s2.toLowerCase();
int result = lower1.compareTo(lower2);
if (result == 0) {
return s1.compareTo(s2); // use case to differentiate "equal" strings
}
return result;
}
@Override
public String toString() {
return ObjectTools.singletonToString(this);
}
}
}
}
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