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.Iterator;
020    import org.apache.activemq.kaha.impl.index.IndexItem;
021    import org.apache.activemq.kaha.impl.index.IndexLinkedList;
022    
023    /**
024     * Values collection iterator for the MapContainer
025     * 
026     * 
027     */
028    public 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    }