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.set; 018 019import java.util.Comparator; 020import java.util.Set; 021import java.util.SortedSet; 022 023/** 024 * Decorates another <code>SortedSet</code> to provide additional behaviour. 025 * <p> 026 * Methods are forwarded directly to the decorated set. 027 * </p> 028 * 029 * @param <E> the type of the elements in the sorted set 030 * @since 3.0 031 */ 032public abstract class AbstractSortedSetDecorator<E> 033 extends AbstractSetDecorator<E> 034 implements SortedSet<E> { 035 036 /** Serialization version */ 037 private static final long serialVersionUID = -3462240946294214398L; 038 039 /** 040 * Constructor only used in deserialization, do not use otherwise. 041 * @since 3.1 042 */ 043 protected AbstractSortedSetDecorator() { 044 super(); 045 } 046 047 /** 048 * Constructor that wraps (not copies). 049 * 050 * @param set the set to decorate, must not be null 051 * @throws NullPointerException if set is null 052 */ 053 protected AbstractSortedSetDecorator(final Set<E> set) { 054 super(set); 055 } 056 057 /** 058 * Gets the set being decorated. 059 * 060 * @return the decorated set 061 */ 062 @Override 063 protected SortedSet<E> decorated() { 064 return (SortedSet<E>) super.decorated(); 065 } 066 067 //----------------------------------------------------------------------- 068 @Override 069 public SortedSet<E> subSet(final E fromElement, final E toElement) { 070 return decorated().subSet(fromElement, toElement); 071 } 072 073 @Override 074 public SortedSet<E> headSet(final E toElement) { 075 return decorated().headSet(toElement); 076 } 077 078 @Override 079 public SortedSet<E> tailSet(final E fromElement) { 080 return decorated().tailSet(fromElement); 081 } 082 083 @Override 084 public E first() { 085 return decorated().first(); 086 } 087 088 @Override 089 public E last() { 090 return decorated().last(); 091 } 092 093 @Override 094 public Comparator<? super E> comparator() { 095 return decorated().comparator(); 096 } 097 098}