/*
* Copyright (C) 2007 Google Inc.
*
* 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 com.google.common.annotations.GwtCompatible;
import java.util.Collection;
import java.util.Iterator;
import checkers.nullness.quals.*;
/**
* A collection which forwards all its method calls to another collection.
* Subclasses should override one or more methods to modify the behavior of
* the backing collection as desired per the <a
* href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
*
* @see ForwardingObject
* @author Kevin Bourrillion
*/
@GwtCompatible
@SuppressWarnings("nullness:generic.argument")
public abstract class ForwardingCollection<E extends /*@Nullable*/ Object> extends ForwardingObject
implements Collection<E> {
@Override protected abstract Collection<E> delegate();
public Iterator<E> iterator() {
return delegate().iterator();
}
public int size() {
return delegate().size();
}
public boolean removeAll(Collection<?> collection) {
return delegate().removeAll(collection);
}
public boolean isEmpty() {
return delegate().isEmpty();
}
public boolean contains(/*@Nullable*/ Object object) {
return delegate().contains(object);
}
@SuppressWarnings("nullness")
// Suppressed due to annotations of toArray
public /*@Nullable*/ Object[] toArray() {
return delegate().toArray();
}
@SuppressWarnings("nullness")
public <T extends /*@Nullable*/ Object> T[] toArray(T[] array) {
return delegate().toArray(array);
}
public boolean add(E element) {
return delegate().add(element);
}
public boolean remove(/*@Nullable*/ Object object) {
return delegate().remove(object);
}
@SuppressWarnings("nullness")
// Suppressed due to the containsAll method in Collection
public boolean containsAll(Collection<? extends /*@Nullable*/ Object> collection) {
return delegate().containsAll(collection);
}
public boolean addAll(Collection<? extends E> collection) {
return delegate().addAll(collection);
}
@SuppressWarnings("nullness")
// Suppressed due to the containsAll method in Collection
public boolean retainAll(Collection<? extends /*@Nullable*/ Object> collection) {
return delegate().retainAll(collection);
}
public void clear() {
delegate().clear();
}
}