001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.collections4.bag; 018 019import java.util.Comparator; 020 021import org.apache.commons.collections4.SortedBag; 022 023/** 024 * Decorates another <code>SortedBag</code> to provide additional behaviour. 025 * <p> 026 * Methods are forwarded directly to the decorated bag. 027 * </p> 028 * 029 * @param <E> the type of elements in this bag 030 * @since 3.0 031 */ 032public abstract class AbstractSortedBagDecorator<E> 033 extends AbstractBagDecorator<E> implements SortedBag<E> { 034 035 /** Serialization version */ 036 private static final long serialVersionUID = -8223473624050467718L; 037 038 /** 039 * Constructor only used in deserialization, do not use otherwise. 040 * @since 3.1 041 */ 042 protected AbstractSortedBagDecorator() { 043 super(); 044 } 045 046 /** 047 * Constructor that wraps (not copies). 048 * 049 * @param bag the bag to decorate, must not be null 050 * @throws NullPointerException if bag is null 051 */ 052 protected AbstractSortedBagDecorator(final SortedBag<E> bag) { 053 super(bag); 054 } 055 056 /** 057 * Gets the bag being decorated. 058 * 059 * @return the decorated bag 060 */ 061 @Override 062 protected SortedBag<E> decorated() { 063 return (SortedBag<E>) super.decorated(); 064 } 065 066 //----------------------------------------------------------------------- 067 068 @Override 069 public E first() { 070 return decorated().first(); 071 } 072 073 @Override 074 public E last() { 075 return decorated().last(); 076 } 077 078 @Override 079 public Comparator<? super E> comparator() { 080 return decorated().comparator(); 081 } 082 083}