KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > activemq > kaha > impl > container > ContainerKeySetIterator


1 /**
2  *
3  * Licensed to the Apache Software Foundation (ASF) under one or more
4  * contributor license agreements. See the NOTICE file distributed with
5  * this work for additional information regarding copyright ownership.
6  * The ASF licenses this file to You under the Apache License, Version 2.0
7  * (the "License"); you may not use this file except in compliance with
8  * the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 package org.apache.activemq.kaha.impl.container;
19
20 import java.util.Iterator JavaDoc;
21 import org.apache.activemq.kaha.impl.index.IndexItem;
22 import org.apache.activemq.kaha.impl.index.IndexLinkedList;
23
24
25 /**
26 *Iterator for the set of keys for a container
27 *
28 * @version $Revision: 1.2 $
29 */
30 public class ContainerKeySetIterator implements Iterator JavaDoc{
31     private MapContainerImpl container;
32     private IndexLinkedList list;
33     protected IndexItem nextItem;
34     protected IndexItem currentItem;
35    
36     ContainerKeySetIterator(MapContainerImpl container){
37         this.container = container;
38         this.list=container.getInternalList();
39         this.currentItem=list.getRoot();
40         this.nextItem=list.getNextEntry(currentItem);
41     }
42     
43     public boolean hasNext(){
44         return nextItem!=null;
45     }
46
47     public Object JavaDoc next(){
48         currentItem=nextItem;
49         Object JavaDoc result=container.getKey(nextItem);
50         nextItem=list.getNextEntry(nextItem);
51         return result;
52     }
53
54     public void remove(){
55         if(currentItem!=null){
56             container.remove(currentItem);
57         }
58     }
59 }
60
Popular Tags