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/*
* Copyright (C) 2007 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.QueueTestSuiteBuilder;
import com.google.common.collect.testing.TestStringQueueGenerator;
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 java.util.Queue;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Tests for {@code ForwardingQueue}.
*
* @author Robert Konigsberg
* @author Louis Wasserman
*/
public class ForwardingQueueTest extends TestCase {
static final class StandardImplForwardingQueue<T> extends ForwardingQueue<T> {
private final Queue<T> backingQueue;
StandardImplForwardingQueue(Queue<T> backingQueue) {
this.backingQueue = backingQueue;
}
@Override
protected Queue<T> delegate() {
return backingQueue;
}
@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();
}
@Override
public boolean offer(T o) {
return standardOffer(o);
}
@Override
public @Nullable T peek() {
return standardPeek();
}
@Override
public @Nullable T poll() {
return standardPoll();
}
}
public static Test suite() {
TestSuite suite = new TestSuite();
suite.addTestSuite(ForwardingQueueTest.class);
suite.addTest(
QueueTestSuiteBuilder.using(
new TestStringQueueGenerator() {
@Override
protected Queue<String> create(String[] elements) {
return new StandardImplForwardingQueue<>(Lists.newLinkedList(asList(elements)));
}
})
.named("ForwardingQueue[LinkedList] with standard implementations")
.withFeatures(
CollectionSize.ANY,
CollectionFeature.ALLOWS_NULL_VALUES,
CollectionFeature.GENERAL_PURPOSE)
.createTestSuite());
return suite;
}
@SuppressWarnings({"rawtypes", "unchecked"})
public void testForwarding() {
new ForwardingWrapperTester()
.testForwarding(
Queue.class,
new Function<Queue, Queue>() {
@Override
public Queue apply(Queue delegate) {
return wrap(delegate);
}
});
}
private static <T> Queue<T> wrap(final Queue<T> delegate) {
return new ForwardingQueue<T>() {
@Override
protected Queue<T> delegate() {
return delegate;
}
};
}
}
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