Java tutorial
/* * 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 com.google.common.annotations.GwtCompatible; import java.util.Collection; import java.util.Map; import java.util.Set; /** * A table which forwards all its method calls to another table. Subclasses * should override one or more methods to modify the behavior of the backing * map as desired per the <a * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. * * @author Gregory Kick * @since 7.0 */ @GwtCompatible public abstract class ForwardingTable<R, C, V> extends ForwardingObject implements Table<R, C, V> { /** Constructor for use by subclasses. */ protected ForwardingTable() { } @Override protected abstract Table<R, C, V> delegate(); @Override public Set<Cell<R, C, V>> cellSet() { return delegate().cellSet(); } @Override public void clear() { delegate().clear(); } @Override public Map<R, V> column(C columnKey) { return delegate().column(columnKey); } @Override public Set<C> columnKeySet() { return delegate().columnKeySet(); } @Override public Map<C, Map<R, V>> columnMap() { return delegate().columnMap(); } @Override public boolean contains(Object rowKey, Object columnKey) { return delegate().contains(rowKey, columnKey); } @Override public boolean containsColumn(Object columnKey) { return delegate().containsColumn(columnKey); } @Override public boolean containsRow(Object rowKey) { return delegate().containsRow(rowKey); } @Override public boolean containsValue(Object value) { return delegate().containsValue(value); } @Override public V get(Object rowKey, Object columnKey) { return delegate().get(rowKey, columnKey); } @Override public boolean isEmpty() { return delegate().isEmpty(); } @Override public V put(R rowKey, C columnKey, V value) { return delegate().put(rowKey, columnKey, value); } @Override public void putAll(Table<? extends R, ? extends C, ? extends V> table) { delegate().putAll(table); } @Override public V remove(Object rowKey, Object columnKey) { return delegate().remove(rowKey, columnKey); } @Override public Map<C, V> row(R rowKey) { return delegate().row(rowKey); } @Override public Set<R> rowKeySet() { return delegate().rowKeySet(); } @Override public Map<R, Map<C, V>> rowMap() { return delegate().rowMap(); } @Override public int size() { return delegate().size(); } @Override public Collection<V> values() { return delegate().values(); } @Override public boolean equals(Object obj) { return (obj == this) || delegate().equals(obj); } @Override public int hashCode() { return delegate().hashCode(); } }