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} to provide additional behavior. 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 } 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 @Override 056 public Comparator<? super E> comparator() { 057 return decorated().comparator(); 058 } 059 060 /** 061 * Gets the bag being decorated. 062 * 063 * @return the decorated bag 064 */ 065 @Override 066 protected SortedBag<E> decorated() { 067 return (SortedBag<E>) super.decorated(); 068 } 069 070 @Override 071 public E first() { 072 return decorated().first(); 073 } 074 075 @Override 076 public E last() { 077 return decorated().last(); 078 } 079 080}