package org.apache.ojb.broker.metadata.fieldaccess;

 /* 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.core.PersistenceBrokerConfiguration;

 import org.apache.ojb.broker.metadata.MetadataException;

 import org.apache.ojb.broker.util.ClassHelper;

 import org.apache.ojb.broker.util.configuration.ConfigurationException;

 import org.apache.ojb.broker.util.configuration.impl.OjbConfigurator;

 import org.apache.ojb.broker.util.logging.Logger;

 import org.apache.ojb.broker.util.logging.LoggerFactory;

 /**

  * @author <a href="mailto:thma@apache.org">Thomas Mahler<a>

  * @version $Id: PersistentFieldFactory.java,v 1.1 2007-08-24 22:17:35 ewestfal Exp $

  */

 public class PersistentFieldFactory

 {

     private static Logger log = LoggerFactory.getLogger(PersistentFieldFactory.class);

     private static final Class DEFAULT_PERSISTENT_FIELD_IMPL = PersistentFieldDirectImpl.class;

     private static final Class[] METHOD_PARAMETER_TYPES = {Class.class, String.class};

 //    private static boolean usesAccessorsAndMutators = false;

 //    private static boolean usesAccessorsAndMutatorsCheck = false;

     /**

      * @throws MetadataException if an erros occours when creating the PersistenteField

      */

         public static PersistentField createPersistentField(Class attributeType, String attributeName)

         {

                 return createPersistentField(null,attributeType,attributeName);

         }

     public static PersistentField createPersistentField(String persistentFieldClassName, Class attributeType, String attributeName)

     {

         try

         {

             if (persistentFieldClassName == null)

             {

                 synchronized (PersistentFieldFactory.class)

                 {

                     persistentFieldClassName = getDefaultPersistentFieldClassName();

                 }

             }

             Object[] args = {attributeType, attributeName};

             return (PersistentField) ClassHelper.newInstance(persistentFieldClassName, METHOD_PARAMETER_TYPES, args);

         }

         catch (Exception ex)

         {

             throw new MetadataException("Error creating PersistentField: " +

                     attributeType.getName() + ", " + attributeName, ex);

         }

     }

 //    public static boolean usesAccessorsAndMutators()

 //    {

 //        boolean retval = false;

 //        if (usesAccessorsAndMutatorsCheck)

 //            retval = usesAccessorsAndMutators;

 //        else

 //        {

 //            String className = getDefaultPersistentFieldClassName();

 //            PersistentField field = null;

 //            try

 //            {

 //                field = (PersistentField) ClassHelper.newInstance(className);

 //                usesAccessorsAndMutators = field.usesAccessorsAndMutators();

 //                retval = usesAccessorsAndMutators;

 //            }

 //            catch (Exception e)

 //            {

 //                log.error("Cannot verify 'usesAccessorsAndMutators' attribute for class " + className, e);

 //            }

 //            finally

 //            {

 //                usesAccessorsAndMutatorsCheck = true;

 //            }

 //        }

 //        return retval;

 //    }

     private static String getDefaultPersistentFieldClassName()

     {

         try

         {

             PersistenceBrokerConfiguration config =

                     (PersistenceBrokerConfiguration) OjbConfigurator.getInstance().getConfigurationFor(

                             null);

             Class clazz = config.getPersistentFieldClass();

             return clazz.getName();

         }

         catch (ConfigurationException e)

         {

             log.error("Cannot look-up PersistentField class, use default implementation instead", e);

             return DEFAULT_PERSISTENT_FIELD_IMPL.getName();

         }

     }

 }