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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.catalina.users;


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;


/**
 * JNDI object creation factory for MemoryUserDatabase
 * instances.  This makes it convenient to configure a user database
 * in the global JNDI resources associated with this Catalina instance,
 * and then link to that resource for web applications that administer
 * the contents of the user database.
 *
 * The MemoryUserDatabase instance is configured based
 * on the following parameter values:
 * 
 * pathname - Absolute or relative (to the directory
 *     path specified by the catalina.base system property)
 *     pathname to the XML file from which our user information is loaded,
 *     and to which it is stored.  [conf/tomcat-users.xml]
 * 
 *
 * @author Craig R. McClanahan
 * @since 4.1
 */
public class MemoryUserDatabaseFactory implements ObjectFactory {


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


    /**
     * Create and return a new MemoryUserDatabase instance
     * that has been configured according to the properties of the
     * specified Reference.  If you instance can be created,
     * return 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
     */
    @Override
    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 "org.apache.catalina.UserDatabase"
        if ((obj == null) || !(obj instanceof Reference)) {
            return null;
        }
        Reference ref = (Reference) obj;
        if (!"org.apache.catalina.UserDatabase".equals(ref.getClassName())) {
            return null;
        }

        // Create and configure a MemoryUserDatabase instance based on the
        // RefAddr values associated with this Reference
        MemoryUserDatabase database = new MemoryUserDatabase(name.toString());
        RefAddr ra = null;

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

        ra = ref.get("readonly");
        if (ra != null) {
            database.setReadonly(Boolean.parseBoolean(ra.getContent().toString()));
        }

        ra = ref.get("watchSource");
        if (ra != null) {
            database.setWatchSource(Boolean.parseBoolean(ra.getContent().toString()));
        }

        // Return the configured database instance
        database.open();
        // Don't try something we know won't work
        if (!database.getReadonly()) {
            database.save();
        }
        return database;

    }


}