/*
* Copyright (C) 2009 The Guava Authors
*
* 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 com.google.common.collect;
import static java.util.Arrays.asList;
import com.google.common.base.Function;
import com.google.common.collect.testing.CollectionTestSuiteBuilder;
import com.google.common.collect.testing.MinimalCollection;
import com.google.common.collect.testing.TestStringCollectionGenerator;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.testing.ForwardingWrapperTester;
import java.util.Collection;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* Tests for {@link ForwardingCollection}.
*
* @author Robert Konigsberg
* @author Hayward Chan
* @author Louis Wasserman
*/
public class ForwardingCollectionTest extends TestCase {
static final class StandardImplForwardingCollection<T>
extends ForwardingCollection<T> {
private final Collection<T> backingCollection;
StandardImplForwardingCollection(Collection<T> backingCollection) {
this.backingCollection = backingCollection;
}
@Override protected Collection<T> delegate() {
return backingCollection;
}
@Override public boolean addAll(Collection<? extends T> collection) {
return standardAddAll(collection);
}
@Override public void clear() {
standardClear();
}
@Override public boolean contains(Object object) {
return standardContains(object);
}
@Override public boolean containsAll(Collection<?> collection) {
return standardContainsAll(collection);
}
@Override public boolean remove(Object object) {
return standardRemove(object);
}
@Override public boolean removeAll(Collection<?> collection) {
return standardRemoveAll(collection);
}
@Override public boolean retainAll(Collection<?> collection) {
return standardRetainAll(collection);
}
@Override public Object[] toArray() {
return standardToArray();
}
@Override public <T> T[] toArray(T[] array) {
return standardToArray(array);
}
@Override public String toString() {
return standardToString();
}
}
public static Test suite() {
TestSuite suite = new TestSuite();
suite.addTestSuite(ForwardingCollectionTest.class);
suite.addTest(
CollectionTestSuiteBuilder.using(new TestStringCollectionGenerator() {
@Override protected Collection<String> create(String[] elements) {
return new StandardImplForwardingCollection<String>(
Lists.newLinkedList(asList(elements)));
}
}).named(
"ForwardingCollection[LinkedList] with standard implementations")
.withFeatures(CollectionSize.ANY,
CollectionFeature.ALLOWS_NULL_VALUES,
CollectionFeature.GENERAL_PURPOSE).createTestSuite());
suite.addTest(
CollectionTestSuiteBuilder.using(new TestStringCollectionGenerator() {
@Override protected Collection<String> create(String[] elements) {
return new StandardImplForwardingCollection<String>(
MinimalCollection.of(elements));
}
}).named(
"ForwardingCollection[MinimalCollection] with standard"
+ " implementations")
.withFeatures(CollectionSize.ANY,
CollectionFeature.ALLOWS_NULL_VALUES).createTestSuite());
return suite;
}
@SuppressWarnings({"rawtypes", "unchecked"})
public void testForwarding() {
new ForwardingWrapperTester()
.testForwarding(Collection.class, new Function<Collection, Collection>() {
@Override public Collection apply(Collection delegate) {
return wrap(delegate);
}
});
}
private static <T> Collection<T> wrap(final Collection<T> delegate) {
return new ForwardingCollection<T>() {
@Override protected Collection<T> delegate() {
return delegate;
}
};
}
}