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.activemq.kaha.impl.container;
018
019import java.util.Iterator;
020import org.apache.activemq.kaha.impl.index.IndexItem;
021import org.apache.activemq.kaha.impl.index.IndexLinkedList;
022
023/**
024 * Values collection iterator for the MapContainer
025 * 
026 * 
027 */
028public class ContainerValueCollectionIterator implements Iterator {
029
030    protected BaseContainerImpl container;
031    protected IndexLinkedList list;
032    protected IndexItem nextItem;
033    protected IndexItem currentItem;
034
035    ContainerValueCollectionIterator(BaseContainerImpl container, IndexLinkedList list, IndexItem start) {
036        this.container = container;
037        this.list = list;
038        this.currentItem = start;
039        this.nextItem = list.getNextEntry((IndexItem)list.refreshEntry(start));
040    }
041
042    public boolean hasNext() {
043        return nextItem != null;
044    }
045
046    public Object next() {
047        synchronized (container) {
048            nextItem = (IndexItem)list.refreshEntry(nextItem);
049            currentItem = nextItem;
050            Object result = container.getValue(nextItem);
051            nextItem = list.getNextEntry(nextItem);
052            return result;
053        }
054    }
055
056    public void remove() {
057        synchronized (container) {
058            if (currentItem != null) {
059                currentItem = (IndexItem)list.refreshEntry(currentItem);
060                container.remove(currentItem);
061            }
062        }
063    }
064}