/*
    * 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();
    }
  }