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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,
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 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
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package org.apache.cayenne.conn;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;

import org.apache.log4j.Logger;


/**
 * Basic JNDI object factory that creates an instance of
 * PoolManager that has been configured based on the
 * RefAddr values of the specified Reference.
 *
 * Here is a sample Tomcat 4.x configuration that sets this class
 * as a default factory for javax.sql.DataSource objects:
<ResourceParams name="jdbc/mydb">
    <parameter>
        <name>factory</name>
        <value>org.apache.cayenne.conn.ContainerPoolFactory</value>
    </parameter>

    <parameter>
        <name>username</name>
        <value>andrei</value>
    </parameter>
            
    <parameter>
        <name>password</name>
        <value>bla-bla</value>
    </parameter>
                
    <parameter>
        <name>driver</name>
        <value>org.gjt.mm.mysql.Driver</value>
    </parameter>
            
    <parameter>
        <name>url</name>
        <value>jdbc:mysql://noise/cayenne</value>
    </parameter>
            
    <parameter>
        <name>min</name>
        <value>1</value>
    </parameter>
            
    <parameter>
        <name>max</name>
        <value>3</value>
    </parameter>
</ResourceParams>

 *
 * After ContainerPoolFactory was configured to be used within the container 
 * (see above for Tomcat example), you can reference your "jdbc/mydb" DataSource in
 * web application deployment descriptor like that (per Servlet Specification): 
 *<resource-ref>
    <es-ref-name>jdbc/mydb</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>
 
 *
 * @author Andrei Adamchik
 */

public class ContainerPoolFactory implements ObjectFactory {
    private static Logger logObj = Logger.getLogger(ContainerPoolFactory.class);


    /**
     * Creates and returns a new PoolManager instance.  If no
     * instance can be created, returns null instead.
     *
     * @param obj The possibly null object containing location or
     *  reference information that can be used in creating an object
     * @param name The name of this object relative to nameCtx
     * @param nameCtx The context relative to which the name
     *  parameter is specified, or null if name
     *  is relative to the default initial context
     * @param environment The possibly null environment that is used in
     *  creating this object
     *
     * @exception Exception if an exception occurs creating the instance
     */
    public Object getObjectInstance(Object obj, Name name, Context nameCtx,
                                    Hashtable environment)
    throws Exception {
        // We only know how to deal with javax.naming.References
        // that specify a class name of "javax.sql.DataSource"
        if ((obj == null) || !(obj instanceof Reference)) {
            logObj.info("unsupported or null reference: " + obj);
            return null;
        }

        Reference ref = (Reference) obj;
        if (!"javax.sql.DataSource".equals(ref.getClassName())) {
            logObj.info("unsupported type: " + ref.getClassName());
            return null;
        }

        // Create and configure a PoolManager instance based on the
        // RefAddr values associated with this Reference
        RefAddr ra = null;
        String driver = null;
        String url = null;
        int min = 1;
        int max = 1;
        String username = null;
        String password = null;
        
        ra = ref.get("min");
        if (ra != null) {
            min = Integer.parseInt(ra.getContent().toString());
        }
        
        ra = ref.get("max");
        if (ra != null) {
            max = Integer.parseInt(ra.getContent().toString());
        }


        ra = ref.get("driver");
        if (ra != null) {
            driver = ra.getContent().toString();
        }


        ra = ref.get("password");
        if (ra != null) {
            password = ra.getContent().toString();
        }

        ra = ref.get("url");
        if (ra != null) {
            url = ra.getContent().toString();
        }

        ra = ref.get("username");
        if (ra != null) {
            username = ra.getContent().toString();
        }

        logObj.info("Loading datasource driver: " + driver);
        logObj.info("Connecting to URL: " + url);
        return new PoolManager(driver, url, min, max, username, password);
    }
}