trunk/activemq-core/src/main/java/org/apache/activemq/kaha/impl/container/ContainerValueCollectionIterator.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.kaha.impl.container;

import java.util.Iterator;
import org.apache.activemq.kaha.impl.index.IndexItem;
import org.apache.activemq.kaha.impl.index.IndexLinkedList;

/**
 * Values collection iterator for the MapContainer
 * 
 * 
 */
public class ContainerValueCollectionIterator implements Iterator {

    protected BaseContainerImpl container;
    protected IndexLinkedList list;
    protected IndexItem nextItem;
    protected IndexItem currentItem;

    ContainerValueCollectionIterator(BaseContainerImpl container, IndexLinkedList list, IndexItem start) {
        this.container = container;
        this.list = list;
        this.currentItem = start;
        this.nextItem = list.getNextEntry((IndexItem)list.refreshEntry(start));
    }

    public boolean hasNext() {
        return nextItem != null;
    }

    public Object next() {
        synchronized (container) {
            nextItem = (IndexItem)list.refreshEntry(nextItem);
            currentItem = nextItem;
            Object result = container.getValue(nextItem);
            nextItem = list.getNextEntry(nextItem);
            return result;
        }
    }

    public void remove() {
        synchronized (container) {
            if (currentItem != null) {
                currentItem = (IndexItem)list.refreshEntry(currentItem);
                container.remove(currentItem);
            }
        }
    }
}