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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 com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A multimap which forwards all its method calls to another multimap. Subclasses should override
 * one or more methods to modify the behavior of the backing multimap as desired per the decorator pattern.
 *
 * {@code default} method warning: This class does not forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingMultimap}.
 *
 * @author Robert Konigsberg
 * @since 2.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingMultimap
    extends ForwardingObject implements Multimap {

  /** Constructor for use by subclasses. */
  protected ForwardingMultimap() {}

  @Override
  protected abstract Multimap delegate();

  @Override
  public Map> asMap() {
    return delegate().asMap();
  }

  @Override
  public void clear() {
    delegate().clear();
  }

  @Override
  public boolean containsEntry(@CheckForNull Object key, @CheckForNull Object value) {
    return delegate().containsEntry(key, value);
  }

  @Override
  public boolean containsKey(@CheckForNull Object key) {
    return delegate().containsKey(key);
  }

  @Override
  public boolean containsValue(@CheckForNull Object value) {
    return delegate().containsValue(value);
  }

  @Override
  public Collection> entries() {
    return delegate().entries();
  }

  @Override
  public Collection get(@ParametricNullness K key) {
    return delegate().get(key);
  }

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

  @Override
  public Multiset keys() {
    return delegate().keys();
  }

  @Override
  public Set keySet() {
    return delegate().keySet();
  }

  @CanIgnoreReturnValue
  @Override
  public boolean put(@ParametricNullness K key, @ParametricNullness V value) {
    return delegate().put(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean putAll(@ParametricNullness K key, Iterable values) {
    return delegate().putAll(key, values);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean putAll(Multimap multimap) {
    return delegate().putAll(multimap);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean remove(@CheckForNull Object key, @CheckForNull Object value) {
    return delegate().remove(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  public Collection removeAll(@CheckForNull Object key) {
    return delegate().removeAll(key);
  }

  @CanIgnoreReturnValue
  @Override
  public Collection replaceValues(@ParametricNullness K key, Iterable values) {
    return delegate().replaceValues(key, values);
  }

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

  @Override
  public Collection values() {
    return delegate().values();
  }

  @Override
  public boolean equals(@CheckForNull Object object) {
    return object == this || delegate().equals(object);
  }

  @Override
  public int hashCode() {
    return delegate().hashCode();
  }
}