/**********************************************************************
Copyright (c) 2004 Kikuchi Kousuke and others. All rights reserved.
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.
Contributors:
2004 Erik Bengtson - added attach/detach support
2004 Andy Jefferson - added isDetachable flag
2005 Andy Jefferson - updated to use "detachedState"
...
**********************************************************************/
package org.jpox.enhancer.bcel.method;
import org.apache.bcel.Constants;
import org.apache.bcel.generic.IFNULL;
import org.apache.bcel.generic.IF_ICMPEQ;
import org.apache.bcel.generic.InstructionConstants;
import org.apache.bcel.generic.Type;
import org.jpox.enhancer.ClassEnhancer;
import org.jpox.enhancer.bcel.BCELClassEnhancer;
/**
* Creates the jdoGetObjectId() method. The generated code looks like this :-
* <pre>
* if (jdoStateManager != null)
* return jdoStateManager.getObjectId(this);
* if (this.jdoIsDetached() != true)
* return null;
* return jdoDetachedState[0];
* </pre>
*
* @version $Revision: 1.6 $
*/
public class JdoGetObjectId extends SimpleStateManagerCall
{
public static JdoGetObjectId getInstance(BCELClassEnhancer gen)
{
return new JdoGetObjectId(ClassEnhancer.MN_JdoGetObjectId, Constants.ACC_PUBLIC | Constants.ACC_FINAL,
Type.OBJECT, Type.NO_ARGS, null, false, gen);
}
/**
* @param methodName
* @param type
* @param resultType
* @param argType
* @param argName
* @param synthetic
* @param gen
*/
public JdoGetObjectId(String methodName, int type, Type resultType, Type[] argType, String[] argName,
boolean synthetic, BCELClassEnhancer gen)
{
super(methodName, type, resultType, argType, argName, synthetic, gen, "getObjectId");
}
/* (non-Javadoc)
* @see org.jpox.enhancer.gen.Callback#execute()
*/
public void execute()
{
if (!enhancer.getClassMetaData().isDetachable())
{
super.execute();
}
else
{
// if (jdoStateManager == null)
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createGetField(className, ClassEnhancer.FN_StateManager, BCELClassEnhancer.OT_StateManager));
IFNULL ifnull = new IFNULL(null);
il.append(ifnull);
// jdoStateManager.getObjectId(this)
// jdoStateManager
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createGetField(className, ClassEnhancer.FN_StateManager, BCELClassEnhancer.OT_StateManager));
// getObjectId(this)
il.append(InstructionConstants.ALOAD_0);
il.append(factory.createInvoke(ClassEnhancer.CN_StateManager, "getObjectId", (Type)returnType,
new Type[]{BCELClassEnhancer.OT_PersistenceCapable}, Constants.INVOKEINTERFACE));
il.append(InstructionConstants.ARETURN);
// jdoIsDetached()
ifnull.setTarget(il.append(InstructionConstants.ALOAD_0));
il.append(factory.createInvoke(ClassEnhancer.CN_PersistenceCapable, ClassEnhancer.MN_JdoIsDetached,
Type.BOOLEAN, Type.NO_ARGS, Constants.INVOKEINTERFACE));
// 0
il.append(InstructionConstants.ICONST_1);
// if (jdoIsDetached() == 1)
IF_ICMPEQ ifIsDetached = new IF_ICMPEQ(null);
il.append(ifIsDetached);
// return null;
il.append(InstructionConstants.ACONST_NULL);
il.append(InstructionConstants.ARETURN);
// return jdoDetachedState[0];
ifIsDetached.setTarget(il.append(InstructionConstants.ALOAD_0));
il.append(factory.createGetField(className, ClassEnhancer.FN_JdoDetachedState, BCELClassEnhancer.OT_ObjectArray));
il.append(InstructionConstants.ICONST_0);
il.append(InstructionConstants.AALOAD);
il.append(InstructionConstants.ARETURN);
}
}
}