package org.apache.ojb.broker.accesslayer.sql;

 /* Copyright 2002-2005 The Apache Software Foundation

  *

  * Licensed 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.

  */

 import org.apache.ojb.broker.util.factory.ConfigurableFactory;

 import org.apache.ojb.broker.platforms.Platform;

 import java.util.Map;

 import java.util.HashMap;

 /**

  * This factory creates SqlGenerator instances. it is a configurable factory and

  * can be used to generate user defined implementations too.

  * @author Thomas Mahler

  */

 public class SqlGeneratorFactory extends ConfigurableFactory

 {

         private static SqlGeneratorFactory instance = null;

     private Map generatorMap = new HashMap();

         /**

          * @see org.apache.ojb.broker.util.factory.ConfigurableFactory#getConfigurationKey()

          */

         protected String getConfigurationKey()

         {

                 return "SqlGeneratorClass";

         }

         public SqlGenerator createSqlGenerator(Platform pf)

         {

                 SqlGenerator gen = (SqlGenerator) generatorMap.get(pf.getClass().getName());

         if(gen == null)

         {

             gen = (SqlGenerator) this.createNewInstance(Platform.class, pf);

             generatorMap.put(pf.getClass(), gen);

         }

         return gen;

         }

         public static SqlGeneratorFactory getInstance()

         {

                 if (instance == null)

                 {

                         instance = new SqlGeneratorFactory();

                 }

                 return instance;

         }

 }