001    package org.apache.ojb.broker.accesslayer;
002    
003    /* Copyright 2002-2005 The Apache Software Foundation
004     *
005     * Licensed under the Apache License, Version 2.0 (the "License");
006     * you may not use this file except in compliance with the License.
007     * You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    import org.apache.ojb.broker.util.factory.ConfigurableFactory;
019    
020    /**
021     * Factory for {@link org.apache.ojb.broker.accesslayer.ConnectionFactory} implementations.
022     * <br/>
023     * See also {@link org.apache.ojb.broker.accesslayer.ConnectionManagerFactory}
024     *
025     * @version $Id: ConnectionFactoryFactory.java,v 1.1 2007-08-24 22:17:30 ewestfal Exp $
026     */
027    public class ConnectionFactoryFactory extends ConfigurableFactory
028    {
029        private static ConnectionFactoryFactory singleton = new ConnectionFactoryFactory();
030        private ConnectionFactory conFactory;
031    
032        public synchronized static ConnectionFactoryFactory getInstance()
033        {
034            return singleton;
035        }
036    
037        /**
038         * Returns the used {@link ConnectionFactory} implementation. Currently each call
039         * returns the same implementation instance.
040         */
041        public synchronized ConnectionFactory createConnectionFactory()
042        {
043            if (conFactory == null)
044            {
045                conFactory = (ConnectionFactory) createNewInstance();
046            }
047            return conFactory;
048        }
049    
050        protected String getConfigurationKey()
051        {
052            return "ConnectionFactoryClass";
053        }
054    }