ActiveMQ example source code file (PropertyExpression.java)

This example ActiveMQ source code file (PropertyExpression.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

activemqdestination, io, ioexception, ioexception, jmsexception, jmspriority, jmsxdeliverycount, jmsxproducertxid, object, object, propertyexpression, string, string, subexpression, subexpression, util

The ActiveMQ PropertyExpression.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.filter;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.jms.DeliveryMode;
import javax.jms.JMSException;

import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.TransactionId;
import org.apache.activemq.util.JMSExceptionSupport;

/**
 * Represents a property expression
 * 
 * 
 */
public class PropertyExpression implements Expression {

    private static final Map<String, SubExpression> JMS_PROPERTY_EXPRESSIONS = new HashMap();

    interface SubExpression {
        Object evaluate(Message message);
    }

    static {
        JMS_PROPERTY_EXPRESSIONS.put("JMSDestination", new SubExpression() {

            public Object evaluate(Message message) {
                ActiveMQDestination dest = message.getOriginalDestination();
                if (dest == null) {
                    dest = message.getDestination();
                }
                if (dest == null) {
                    return null;
                }
                return dest.toString();
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSReplyTo", new SubExpression() {

            public Object evaluate(Message message) {
                if (message.getReplyTo() == null) {
                    return null;
                }
                return message.getReplyTo().toString();
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSType", new SubExpression() {

            public Object evaluate(Message message) {
                return message.getType();
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSDeliveryMode", new SubExpression() {

            public Object evaluate(Message message) {
                return Integer.valueOf(message.isPersistent() ? DeliveryMode.PERSISTENT : DeliveryMode.NON_PERSISTENT);
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSPriority", new SubExpression() {

            public Object evaluate(Message message) {
                return Integer.valueOf(message.getPriority());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSMessageID", new SubExpression() {

            public Object evaluate(Message message) {
                if (message.getMessageId() == null) {
                    return null;
                }
                return message.getMessageId().toString();
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSTimestamp", new SubExpression() {

            public Object evaluate(Message message) {
                return Long.valueOf(message.getTimestamp());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSCorrelationID", new SubExpression() {

            public Object evaluate(Message message) {
                return message.getCorrelationId();
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSExpiration", new SubExpression() {

            public Object evaluate(Message message) {
                return Long.valueOf(message.getExpiration());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSRedelivered", new SubExpression() {

            public Object evaluate(Message message) {
                return Boolean.valueOf(message.isRedelivered());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSXDeliveryCount", new SubExpression() {

            public Object evaluate(Message message) {
                return Integer.valueOf(message.getRedeliveryCounter() + 1);
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSXGroupID", new SubExpression() {

            public Object evaluate(Message message) {
                return message.getGroupID();
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSXGroupSeq", new SubExpression() {

            public Object evaluate(Message message) {
                return new Integer(message.getGroupSequence());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSXProducerTXID", new SubExpression() {

            public Object evaluate(Message message) {
                TransactionId txId = message.getOriginalTransactionId();
                if (txId == null) {
                    txId = message.getTransactionId();
                }
                if (txId == null) {
                    return null;
                }
                return new Integer(txId.toString());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSActiveMQBrokerInTime", new SubExpression() {

            public Object evaluate(Message message) {
                return Long.valueOf(message.getBrokerInTime());
            }
        });
        JMS_PROPERTY_EXPRESSIONS.put("JMSActiveMQBrokerOutTime", new SubExpression() {

            public Object evaluate(Message message) {
                return Long.valueOf(message.getBrokerOutTime());
            }
        });
    }

    private final String name;
    private final SubExpression jmsPropertyExpression;

    public PropertyExpression(String name) {
        this.name = name;
        jmsPropertyExpression = JMS_PROPERTY_EXPRESSIONS.get(name);
    }

    public Object evaluate(MessageEvaluationContext message) throws JMSException {
        try {
            if (message.isDropped()) {
                return null;
            }

            if (jmsPropertyExpression != null) {
                return jmsPropertyExpression.evaluate(message.getMessage());
            }
            try {
                return message.getMessage().getProperty(name);
            } catch (IOException ioe) {
                throw JMSExceptionSupport.create("Could not get property: " + name + " reason: " + ioe.getMessage(), ioe);
            }
        } catch (IOException e) {
            throw JMSExceptionSupport.create(e);
        }

    }

    public Object evaluate(Message message) throws JMSException {
        if (jmsPropertyExpression != null) {
            return jmsPropertyExpression.evaluate(message);
        }
        try {
            return message.getProperty(name);
        } catch (IOException ioe) {
            throw JMSExceptionSupport.create(ioe);
        }
    }

    public String getName() {
        return name;
    }

    /**
     * @see java.lang.Object#toString()
     */
    public String toString() {
        return name;
    }

    /**
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        return name.hashCode();
    }

    /**
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object o) {

        if (o == null || !this.getClass().equals(o.getClass())) {
            return false;
        }
        return name.equals(((PropertyExpression)o).name);

    }

}