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DataNucleus Enhancer is a Java byte-code enhancer for use with DataNucleus.
/**********************************************************************
Copyright (c) 2007 Andy Jefferson 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:
...
**********************************************************************/
package org.datanucleus.enhancer.asm.method;
import org.datanucleus.enhancer.ClassEnhancer;
import org.datanucleus.enhancer.asm.ASMClassMethod;
import org.datanucleus.enhancer.asm.ASMUtils;
import org.datanucleus.metadata.AbstractMemberMetaData;
import org.datanucleus.metadata.ClassMetaData;
import org.datanucleus.metadata.IdentityType;
import org.datanucleus.util.ClassUtils;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
/**
* Method to generate the method "jdoNewObjectIdInstance" using ASM.
* For datastore/nondurable identity this is
*
* public Object jdoNewObjectIdInstance(Object key)
* {
* return null;
* }
*
* and for SingleFieldIdentity
*
* public Object jdoNewObjectIdInstance(Object key)
* {
* if (key == null)
* throw new IllegalArgumentException("key is null");
* if (key instanceof String != true)
* return new YYYIdentity(this.getClass(), (YYY) key);
* return new YYYIdentity(this.getClass(), (String) key);
* }
*
* and for user-supplied object ids
*
* public Object jdoNewObjectIdInstance(Object key)
* {
* return new UserPrimaryKey((String) key);
* }
*
*/
public class JdoNewObjectIdInstance2 extends ASMClassMethod
{
public static JdoNewObjectIdInstance2 getInstance(ClassEnhancer enhancer)
{
return new JdoNewObjectIdInstance2(enhancer, enhancer.getNewObjectIdInstanceMethodName(),
Opcodes.ACC_PUBLIC/* | Opcodes.ACC_FINAL*/,
Object.class, new Class[] {Object.class}, new String[] {"key"});
}
/**
* Constructor.
* @param enhancer ClassEnhancer
* @param name Name of method
* @param access Access type
* @param returnType Return type
* @param argTypes Argument types
* @param argNames Argument names
*/
public JdoNewObjectIdInstance2(ClassEnhancer enhancer, String name, int access,
Object returnType, Object[] argTypes, String[] argNames)
{
super(enhancer, name, access, returnType, argTypes, argNames);
}
/**
* Method to add the contents of the class method.
*/
public void execute()
{
visitor.visitCode();
Label startLabel = new Label();
visitor.visitLabel(startLabel);
ClassMetaData cmd = enhancer.getClassMetaData();
if (cmd.getIdentityType() == IdentityType.APPLICATION)
{
// application identity
if (!cmd.isInstantiable())
{
// Application identity but mapped-superclass with no PK defined, so throw exception
visitor.visitTypeInsn(Opcodes.NEW, "javax/jdo/JDOFatalInternalException");
visitor.visitInsn(Opcodes.DUP);
visitor.visitLdcInsn("This class has no identity");
visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "javax/jdo/JDOFatalInternalException", "", "(Ljava/lang/String;)V");
visitor.visitInsn(Opcodes.ATHROW);
Label endLabel = new Label();
visitor.visitLabel(endLabel);
visitor.visitLocalVariable("this", getClassEnhancer().getClassDescriptor(), null, startLabel, endLabel, 0);
visitor.visitLocalVariable("key", "Ljava/lang/Object;", null, startLabel, endLabel, 1);
visitor.visitMaxs(3, 2);
}
else
{
String objectIdClass = cmd.getObjectidClass();
int[] pkFieldNums = cmd.getPKMemberPositions();
if (enhancer.getMetaDataManager().getApiAdapter().isSingleFieldIdentityClass(objectIdClass))
{
// SingleFieldIdentity
String ACN_objectIdClass = objectIdClass.replace('.', '/');
AbstractMemberMetaData fmd = enhancer.getClassMetaData().getMetaDataForManagedMemberAtAbsolutePosition(pkFieldNums[0]);
{
// if (key == null) throw new IllegalArgumentException("...");
visitor.visitVarInsn(Opcodes.ALOAD, 1);
Label l1 = new Label();
visitor.visitJumpInsn(Opcodes.IFNONNULL, l1);
visitor.visitTypeInsn(Opcodes.NEW, "java/lang/IllegalArgumentException");
visitor.visitInsn(Opcodes.DUP);
visitor.visitLdcInsn("key is null");
visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/IllegalArgumentException", "", "(Ljava/lang/String;)V");
visitor.visitInsn(Opcodes.ATHROW);
// Object constructor : "if (key instanceof String != true) return new XXXIdentity(this.getClass(), key);"
visitor.visitLabel(l1);
visitor.visitVarInsn(Opcodes.ALOAD, 1);
visitor.visitTypeInsn(Opcodes.INSTANCEOF, "java/lang/String");
Label l3 = new Label();
visitor.visitJumpInsn(Opcodes.IFNE, l3);
visitor.visitTypeInsn(Opcodes.NEW, ACN_objectIdClass);
visitor.visitInsn(Opcodes.DUP);
visitor.visitVarInsn(Opcodes.ALOAD, 0);
visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;");
visitor.visitVarInsn(Opcodes.ALOAD, 1);
String objectTypeInConstructor = ASMUtils.getASMClassNameForSingleFieldIdentityConstructor(fmd.getType());
Class primitiveType = ClassUtils.getPrimitiveTypeForType(fmd.getType());
if (primitiveType != null)
{
objectTypeInConstructor = fmd.getTypeName().replace('.', '/');
}
if (!objectIdClass.equals(enhancer.getObjectIdentityClass().getName()) || primitiveType != null)
{
// Add cast if using an Object based type or an Object wrapper of a primitive
visitor.visitTypeInsn(Opcodes.CHECKCAST, objectTypeInConstructor);
}
visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, ACN_objectIdClass, "",
"(Ljava/lang/Class;" + "L" + objectTypeInConstructor + ";)V");
visitor.visitInsn(Opcodes.ARETURN);
// String constructor : "return new XXXIdentity(this.getClass(), (String) key);"
visitor.visitLabel(l3);
visitor.visitTypeInsn(Opcodes.NEW, ACN_objectIdClass);
visitor.visitInsn(Opcodes.DUP);
visitor.visitVarInsn(Opcodes.ALOAD, 0);
visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;");
visitor.visitVarInsn(Opcodes.ALOAD, 1);
visitor.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/String");
visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, ACN_objectIdClass, "",
"(Ljava/lang/Class;Ljava/lang/String;" + ")V");
visitor.visitInsn(Opcodes.ARETURN);
Label endLabel = new Label();
visitor.visitLabel(endLabel);
visitor.visitLocalVariable("this", getClassEnhancer().getClassDescriptor(), null, startLabel, endLabel, 0);
visitor.visitLocalVariable("key", ASMUtils.CD_Object, null, startLabel, endLabel, 1);
visitor.visitMaxs(4, 2);
}
}
else
{
// User-provided app identity, and compound identity
String ACN_objectIdClass = objectIdClass.replace('.', '/');
visitor.visitTypeInsn(Opcodes.NEW, ACN_objectIdClass);
visitor.visitInsn(Opcodes.DUP);
visitor.visitVarInsn(Opcodes.ALOAD, 1);
visitor.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/String");
visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, ACN_objectIdClass, "", "(Ljava/lang/String;)V");
visitor.visitInsn(Opcodes.ARETURN);
Label endLabel = new Label();
visitor.visitLabel(endLabel);
visitor.visitLocalVariable("this", getClassEnhancer().getClassDescriptor(), null, startLabel, endLabel, 0);
visitor.visitLocalVariable(argNames[0], ASMUtils.CD_Object, null, startLabel, endLabel, 1);
visitor.visitMaxs(3, 2);
visitor.visitEnd();
}
}
}
else
{
// datastore/nondurable identity
visitor.visitInsn(Opcodes.ACONST_NULL);
visitor.visitInsn(Opcodes.ARETURN);
Label endLabel = new Label();
visitor.visitLabel(endLabel);
visitor.visitLocalVariable("this", getClassEnhancer().getClassDescriptor(), null, startLabel, endLabel, 0);
visitor.visitLocalVariable(argNames[0], "Ljava/lang/Object;", null, startLabel, endLabel, 1);
visitor.visitMaxs(1, 2);
}
visitor.visitEnd();
}
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