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Tomcat example source code file (ResourceFactory.java)

This example Tomcat source code file (ResourceFactory.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 - Tomcat tags/keywords

classloader, context, could, could, hashtable, naming, namingexception, namingexception, object, objectfactory, objectfactory, reference, string, string, throwable, util

The Tomcat ResourceFactory.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.naming.factory;

import java.util.Hashtable;
import javax.naming.Name;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.RefAddr;
import javax.naming.spi.ObjectFactory;
import org.apache.naming.ResourceRef;

/**
 * Object factory for Resources.
 * 
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class ResourceFactory
    implements ObjectFactory {


    // ----------------------------------------------------------- Constructors


    // -------------------------------------------------------------- Constants


    // ----------------------------------------------------- Instance Variables


    // --------------------------------------------------------- Public Methods


    // -------------------------------------------------- ObjectFactory Methods


    /**
     * Crete a new DataSource instance.
     * 
     * @param obj The reference object describing the DataSource
     */
    public Object getObjectInstance(Object obj, Name name, Context nameCtx,
                                    Hashtable environment)
        throws Exception {
        
        if (obj instanceof ResourceRef) {
            Reference ref = (Reference) obj;
            ObjectFactory factory = null;
            RefAddr factoryRefAddr = ref.get(Constants.FACTORY);
            if (factoryRefAddr != null) {
                // Using the specified factory
                String factoryClassName = 
                    factoryRefAddr.getContent().toString();
                // Loading factory
                ClassLoader tcl = 
                    Thread.currentThread().getContextClassLoader();
                Class factoryClass = null;
                if (tcl != null) {
                    try {
                        factoryClass = tcl.loadClass(factoryClassName);
                    } catch(ClassNotFoundException e) {
                        NamingException ex = new NamingException
                            ("Could not load resource factory class");
                        ex.initCause(e);
                        throw ex;
                    }
                } else {
                    try {
                        factoryClass = Class.forName(factoryClassName);
                    } catch(ClassNotFoundException e) {
                        NamingException ex = new NamingException
                            ("Could not load resource factory class");
                        ex.initCause(e);
                        throw ex;
                    }
                }
                if (factoryClass != null) {
                    try {
                        factory = (ObjectFactory) factoryClass.newInstance();
                    } catch (Throwable t) {
                        if (t instanceof NamingException)
                            throw (NamingException) t;
                        NamingException ex = new NamingException
                            ("Could not create resource factory instance");
                        ex.initCause(t);
                        throw ex;
                    }
                }
            } else {
                if (ref.getClassName().equals("javax.sql.DataSource")) {
                    String javaxSqlDataSourceFactoryClassName =
                        System.getProperty("javax.sql.DataSource.Factory",
                                           Constants.DBCP_DATASOURCE_FACTORY);
                    try {
                        factory = (ObjectFactory) 
                            Class.forName(javaxSqlDataSourceFactoryClassName)
                            .newInstance();
                    } catch (Throwable t) {
                        NamingException ex = new NamingException
                            ("Could not create resource factory instance");
                        ex.initCause(t);
                        throw ex;
                    }
                } else if (ref.getClassName().equals("javax.mail.Session")) {
                    String javaxMailSessionFactoryClassName =
                        System.getProperty("javax.mail.Session.Factory",
                                           "org.apache.naming.factory.MailSessionFactory");
                    try {
                        factory = (ObjectFactory) 
                            Class.forName(javaxMailSessionFactoryClassName)
                            .newInstance();
                    } catch(Throwable t) {
                        NamingException ex = new NamingException
                            ("Could not create resource factory instance");
                        ex.initCause(t);
                        throw ex;
                    }
                }
            }
            if (factory != null) {
                return factory.getObjectInstance
                    (obj, name, nameCtx, environment);
            } else {
                throw new NamingException
                    ("Cannot create resource instance");
            }
        }
        
        return null;

    }


}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat ResourceFactory.java source code file:

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