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The ActiveMQ Client implementation
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/**
 * 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.jndi;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Properties;

import javax.naming.NamingException;
import javax.naming.Reference;

/**
 * Facilitates objects to be stored in JNDI as properties
 */

public abstract class JNDIBaseStorable implements JNDIStorableInterface, Externalizable {

    private Properties properties;

    /**
     * Set the properties that will represent the instance in JNDI
     * 
     * @param props
     */
    protected abstract void buildFromProperties(Properties props);

    /**
     * Initialize the instance from properties stored in JNDI
     * 
     * @param props
     */

    protected abstract void populateProperties(Properties props);

    /**
     * set the properties for this instance as retrieved from JNDI
     * 
     * @param props
     */

    public synchronized void setProperties(Properties props) {
        this.properties = props;
        buildFromProperties(props);
    }

    /**
     * Get the properties from this instance for storing in JNDI
     * 
     * @return the properties
     */

    public synchronized Properties getProperties() {
        if (this.properties == null) {
            this.properties = new Properties();
        }
        populateProperties(this.properties);
        return this.properties;
    }

    /**
     * Retrive a Reference for this instance to store in JNDI
     * 
     * @return the built Reference
     * @throws NamingException if error on building Reference
     */
    public Reference getReference() throws NamingException {
        return JNDIReferenceFactory.createReference(this.getClass().getName(), this);
    }

    /**
     * @param in
     * @throws IOException
     * @throws ClassNotFoundException
     * @see java.io.Externalizable#readExternal(java.io.ObjectInput)
     */
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        Properties props = (Properties)in.readObject();
        if (props != null) {
            setProperties(props);
        }

    }

    /**
     * @param out
     * @throws IOException
     * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput)
     */
    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeObject(getProperties());

    }

}