package org.apache.ojb.otm.kit;

 /* Copyright 2003-2005 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.Identity;

 import org.apache.ojb.otm.OTMKit;

 import org.apache.ojb.otm.copy.*;

 import org.apache.ojb.otm.lock.map.InMemoryLockMap;

 import org.apache.ojb.otm.lock.map.LockMap;

 import org.apache.ojb.otm.lock.wait.LockWaitStrategy;

 import org.apache.ojb.otm.lock.wait.TimeoutStrategy;

 import org.apache.ojb.otm.swizzle.CopySwizzling;

 import org.apache.ojb.otm.swizzle.Swizzling;

 import org.apache.ojb.otm.transaction.LocalTransactionFactory;

 import org.apache.ojb.otm.transaction.TransactionFactory;

 import java.io.Serializable;

 /**

  * A base implementation of an OTMKit using local transactions, an

  * in-memory lock map, and metadata based object copying for

  * object swizzling in transactional contexts.

  *

  * @author <a href="mailto:rraghuram@hotmail.com">Raghu Rajah</a>

  */

 public class SimpleKit extends OTMKit

 {

     private static SimpleKit _instance;

     protected TransactionFactory _txFactory;

     protected Swizzling _swizzlingStrategy;

     protected LockWaitStrategy _lockWaitStrategy;

     protected LockMap _lockMap;

     protected ObjectCopyStrategy _noOpCopyStrategy;

     protected ObjectCopyStrategy _defaultCopyStrategy;

     protected ObjectCopyStrategy _cloneableCopyStrategy;

     /**

      * Constructor for SimpleKit.

      */

     protected SimpleKit()

     {

         super();

         _txFactory = new LocalTransactionFactory();

         _swizzlingStrategy = new CopySwizzling();

         _lockWaitStrategy = new TimeoutStrategy();

         _lockMap = new InMemoryLockMap();

         _noOpCopyStrategy = new NoOpObjectCopyStrategy();

         //_defaultCopyStrategy = new ReflectiveObjectCopyStrategy();

         //_defaultCopyStrategy = new SerializeObjectCopyStrategy();

         _defaultCopyStrategy = new MetadataObjectCopyStrategy();

         _cloneableCopyStrategy = new CloneableObjectCopyStrategy();

     }

     /**

      * Obtain the single instance of SimpleKit

      */

     public static SimpleKit getInstance()

     {

         if (_instance == null)

         {

             _instance = new SimpleKit();

         }

         return _instance;

     }

     ///////////////////////////////////////

     // OTMKit Protocol

     ///////////////////////////////////////

     /**

      * @see org.apache.ojb.otm.OTMKit#getTransactionFactory()

      */

     protected TransactionFactory getTransactionFactory()

     {

         return _txFactory;

     }

     /**

      * @see org.apache.ojb.otm.OTMKit#getSwizzlingStrategy()

      */

     public Swizzling getSwizzlingStrategy()

     {

         return _swizzlingStrategy;

     }

     /**

     * @see org.apache.ojb.otm.OTMKit#getLockWaitStrategy()

     */

     public LockWaitStrategy getLockWaitStrategy()

     {

         return _lockWaitStrategy;

     }

     /**

      * @see org.apache.ojb.otm.OTMKit#getLockMap()

      */

     public LockMap getLockMap()

     {

         return _lockMap;

     }

     /**

      * @see org.apache.ojb.otm.OTMKit#getCopyStrategy(Identity)

      */

     public ObjectCopyStrategy getCopyStrategy(Identity oid)

     {

         Class clazz = oid.getClass();

         if (OjbCloneable.class.isAssignableFrom(clazz))

         {

             return _cloneableCopyStrategy;

         }

         else if (Serializable.class.isAssignableFrom(clazz))

         {

             return _defaultCopyStrategy;

         }

         else

         {

             return _noOpCopyStrategy;

         }

     }

     /**

      * Should OTM implicitely lock all objects that are reachable

      * from the explicitely locked object? The updates to the locked

      * objects are automatically stored to the database at the end

      * of transaction.

      **/

     public boolean isImplicitLockingUsed()

     {

         return true;

     }

     /**

      * Should OTM verify each inserted object for presence in the database?

      **/

     public boolean isInsertVerified()

     {

         return false;

     }

     /**

      * Should OTM perform INSERTs for the given object eagerly or during commit?

      **/

     public boolean isEagerInsert(Object obj)

     {

         return false;

     }

 }