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 */ 017 package org.apache.activemq.kaha.impl.container; 018 019 import java.util.ArrayList; 020 import java.util.Collection; 021 import java.util.HashSet; 022 import java.util.Iterator; 023 import java.util.List; 024 import java.util.Set; 025 026 /** 027 * Set of Map.Entry objects for a container 028 * 029 * @version $Revision: 1.2 $ 030 */ 031 public class ContainerEntrySet extends ContainerCollectionSupport implements Set { 032 ContainerEntrySet(MapContainerImpl container) { 033 super(container); 034 } 035 036 public boolean contains(Object o) { 037 return container.entrySet().contains(o); 038 } 039 040 public Iterator iterator() { 041 return new ContainerEntrySetIterator(container, buildEntrySet().iterator()); 042 } 043 044 public Object[] toArray() { 045 return buildEntrySet().toArray(); 046 } 047 048 public Object[] toArray(Object[] a) { 049 return buildEntrySet().toArray(a); 050 } 051 052 public boolean add(Object o) { 053 throw new UnsupportedOperationException("Cannot add here"); 054 } 055 056 public boolean remove(Object o) { 057 boolean result = false; 058 if (buildEntrySet().remove(o)) { 059 ContainerMapEntry entry = (ContainerMapEntry)o; 060 container.remove(entry.getKey()); 061 } 062 return result; 063 } 064 065 public boolean containsAll(Collection c) { 066 return buildEntrySet().containsAll(c); 067 } 068 069 public boolean addAll(Collection c) { 070 throw new UnsupportedOperationException("Cannot add here"); 071 } 072 073 public boolean retainAll(Collection c) { 074 List<Object> tmpList = new ArrayList<Object>(); 075 for (Iterator i = c.iterator(); i.hasNext();) { 076 Object o = i.next(); 077 if (!contains(o)) { 078 tmpList.add(o); 079 } 080 } 081 boolean result = false; 082 for (Iterator<Object> i = tmpList.iterator(); i.hasNext();) { 083 result |= remove(i.next()); 084 } 085 return result; 086 } 087 088 public boolean removeAll(Collection c) { 089 boolean result = true; 090 for (Iterator i = c.iterator(); i.hasNext();) { 091 if (!remove(i.next())) { 092 result = false; 093 } 094 } 095 return result; 096 } 097 098 public void clear() { 099 container.clear(); 100 } 101 102 protected Set<ContainerMapEntry> buildEntrySet() { 103 Set<ContainerMapEntry> set = new HashSet<ContainerMapEntry>(); 104 for (Iterator i = container.keySet().iterator(); i.hasNext();) { 105 ContainerMapEntry entry = new ContainerMapEntry(container, i.next()); 106 set.add(entry); 107 } 108 return set; 109 } 110 }