ActiveMQ example source code file (MessageQuery.java)

This example ActiveMQ source code file (MessageQuery.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

enumeration, hashmap, jmsexception, jmsexception, map, message, message, messagequery, object, object, objectmessage, string, string, textmessage, util

The ActiveMQ MessageQuery.java source code

/**
 * 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.web;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.ObjectMessage;
import javax.jms.QueueBrowser;
import javax.jms.TextMessage;

/**
 * Allow the user to browse a message on a queue by its ID
 * 
 * 
 */
public class MessageQuery extends QueueBrowseQuery {

    private String id;
    private Message message;

    public MessageQuery(BrokerFacade brokerFacade, SessionPool sessionPool) throws JMSException {
        super(brokerFacade, sessionPool);
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public void setMessage(Message message) {
        this.message = message;
    }

    public Message getMessage() throws JMSException {
        if (message == null) {
            if (id != null) {
                QueueBrowser tempBrowser=getBrowser();
                Enumeration iter = tempBrowser.getEnumeration();
                while (iter.hasMoreElements()) {
                    Message item = (Message) iter.nextElement();
                    if (id.equals(item.getJMSMessageID())) {
                        message = item;
                        break;
                    }
                }
                tempBrowser.close();
            }

        }
        return message;
    }

    public Object getBody() throws JMSException {
        Message message = getMessage();
        if (message instanceof TextMessage) {
            return ((TextMessage) message).getText();
        }
        if (message instanceof ObjectMessage) {
            try {
                return ((ObjectMessage) message).getObject();
            } catch (JMSException e) {
                //message could not be parsed, make the reason available
                return e;
            }
        }
        if (message instanceof MapMessage) {
            return createMapBody((MapMessage) message);
        }
        return null;
    }

    public Map<String, Object> getPropertiesMap() throws JMSException {
        Map<String, Object> answer = new HashMap();
        Message aMessage = getMessage();
        Enumeration iter = aMessage.getPropertyNames();
        while (iter.hasMoreElements()) {
            String name = (String) iter.nextElement();
            Object value = aMessage.getObjectProperty(name);
            if (value != null) {
                answer.put(name, value);
            }
        }
        return answer;
    }

    protected Map<String, Object> createMapBody(MapMessage mapMessage) throws JMSException {
        Map<String, Object> answer = new HashMap();
        Enumeration iter = mapMessage.getMapNames();
        while (iter.hasMoreElements()) {
            String name = (String) iter.nextElement();
            Object value = mapMessage.getObject(name);
            if (value != null) {
                answer.put(name, value);
            }
        }
        return answer;
    }
}