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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package libcore.util;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import junit.framework.TestCase;
public final class CollectionUtilsTest extends TestCase {
public void testDereferenceIterable() {
List<Reference<String>> refs = new ArrayList<Reference<String>>();
refs.add(newLiteralReference("a"));
refs.add(newLiteralReference("b"));
refs.add(newLiteralReference("c"));
refs.add(newLiteralReference("d"));
refs.add(newLiteralReference("e"));
Iterable<String> strings = CollectionUtils.dereferenceIterable(refs, true);
assertEquals(Arrays.<String>asList("a", "b", "c", "d", "e"), toList(strings));
refs.get(1).clear(); // b
assertEquals(Arrays.<String>asList("a", "c", "d", "e"), toList(strings));
assertEquals(4, refs.size());
Iterator<String> i = strings.iterator();
assertEquals("a", i.next());
i.remove();
assertEquals(3, refs.size());
assertEquals("c", i.next());
assertEquals("d", i.next());
assertTrue(i.hasNext());
try {
i.remove();
fail("Expected hasNext() to make remove() impossible.");
} catch (IllegalStateException expected) {
}
assertEquals("e", i.next());
i.remove();
assertEquals(2, refs.size());
assertFalse(i.hasNext());
refs.get(0).clear(); // c
refs.get(1).clear(); // d
assertEquals(Arrays.<String>asList(), toList(strings));
}
private <T> List<T> toList(Iterable<T> iterable) {
List<T> result = new ArrayList<T>();
for (T t : iterable) {
result.add(t);
}
return result;
}
public void testRemoveDuplicatesOnEmptyCollection() {
List<String> list = new ArrayList<String>();
CollectionUtils.removeDuplicates(list, String.CASE_INSENSITIVE_ORDER);
assertTrue(list.isEmpty());
}
public void testRemoveDuplicatesOnSingletonCollection() {
List<String> list = Arrays.asList("A");
CollectionUtils.removeDuplicates(list, String.CASE_INSENSITIVE_ORDER);
assertEquals(Collections.singletonList("A"), list);
}
public void testRemoveDuplicates() {
List<String> list = new ArrayList<String>();
list.add("A");
list.add("A");
list.add("A");
list.add("B");
list.add("C");
list.add("C");
list.add("C");
CollectionUtils.removeDuplicates(list, String.CASE_INSENSITIVE_ORDER);
assertEquals(Arrays.asList("A", "B", "C"), list);
}
/**
* A reference that must be manually cleared.
*/
public Reference<String> newLiteralReference(String s) {
return new WeakReference<String>(s);
}
}
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