/*
 * 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 java.util.Collection;

import javax.annotation.Nullable;

/**
 * A GWT-only class only used by GWT emulations.  It is used to consolidate the
 * definitions of method delegation to save code size.
 *
 * @author Hayward Chan
 */
// TODO: Make this class GWT serializable.
class ForwardingImmutableCollection<E> extends ImmutableCollection<E> {

  transient final Collection<E> delegate;

  ForwardingImmutableCollection(Collection<E> delegate) {
    this.delegate = delegate;
  }

  @Override public UnmodifiableIterator<E> iterator() {
    return Iterators.unmodifiableIterator(delegate.iterator());
  }

  @Override public boolean contains(@Nullable Object object) {
    return object != null && delegate.contains(object);
  }

  @Override public boolean containsAll(Collection<?> targets) {
    return delegate.containsAll(targets);
  }

  public int size() {
    return delegate.size();
  }

  @Override public boolean isEmpty() {
    return delegate.isEmpty();
  }

  @Override public Object[] toArray() {
    return delegate.toArray();
  }

  @Override public <T> T[] toArray(T[] other) {
    return delegate.toArray(other);
  }

  @Override public String toString() {
    return delegate.toString();
  }
}
