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 * 028 * @param <E> the type of elements in this bag 029 * @since 3.0 030 */ 031public abstract class AbstractSortedBagDecorator<E> 032 extends AbstractBagDecorator<E> implements SortedBag<E> { 033 034 /** Serialization version */ 035 private static final long serialVersionUID = -8223473624050467718L; 036 037 /** 038 * Constructor only used in deserialization, do not use otherwise. 039 * @since 3.1 040 */ 041 protected AbstractSortedBagDecorator() { 042 super(); 043 } 044 045 /** 046 * Constructor that wraps (not copies). 047 * 048 * @param bag the bag to decorate, must not be null 049 * @throws NullPointerException if bag is null 050 */ 051 protected AbstractSortedBagDecorator(final SortedBag<E> bag) { 052 super(bag); 053 } 054 055 /** 056 * Gets the bag being decorated. 057 * 058 * @return the decorated bag 059 */ 060 @Override 061 protected SortedBag<E> decorated() { 062 return (SortedBag<E>) super.decorated(); 063 } 064 065 //----------------------------------------------------------------------- 066 067 @Override 068 public E first() { 069 return decorated().first(); 070 } 071 072 @Override 073 public E last() { 074 return decorated().last(); 075 } 076 077 @Override 078 public Comparator<? super E> comparator() { 079 return decorated().comparator(); 080 } 081 082}