org.datanucleus.enhancer.asm.method.JdoCopyKeyFieldsToObjectId2 Maven / Gradle / Ivy

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DataNucleus Enhancer is a Java byte-code enhancer for use with DataNucleus.
There is a newer version: 3.1.1
/**********************************************************************
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 java.lang.reflect.Modifier;

import org.datanucleus.enhancer.ClassEnhancer;
import org.datanucleus.enhancer.asm.ASMClassEnhancer;
import org.datanucleus.enhancer.asm.ASMClassMethod;
import org.datanucleus.enhancer.asm.ASMUtils;
import org.datanucleus.metadata.AbstractClassMetaData;
import org.datanucleus.metadata.AbstractMemberMetaData;
import org.datanucleus.metadata.ClassMetaData;
import org.datanucleus.metadata.IdentityType;
import org.datanucleus.metadata.PropertyMetaData;
import org.datanucleus.util.ClassUtils;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;

/**
 * Method to generate the method "jdoCopyKeyFieldsToObjectId" using ASM.
 * For datastore/nondurable identity
 *  * public final void jdoCopyKeyFieldsToObjectId(PersistenceCapable.ObjectIdFieldSupplier objectidfieldsupplier,
 *        Object object)
 * {
 * }
 * 
 * and for SingleFieldIdentity
 *  * public final void jdoCopyKeyFieldsToObjectId(PersistenceCapable.ObjectIdFieldSupplier fs, Object oid)
 * {
 *     throw new JDOFatalInternalException("It's illegal to call ...");
 * }
 * 
 * and for user-supplied app identity
 *  * public final void jdoCopyKeyFieldsToObjectId(PersistenceCapable.ObjectIdFieldSupplier fs, Object oid)
 * {
 *     if (fs == null)
 *         throw new IllegalArgumentException("ObjectIdFieldSupplier is null");
 *     if (oid instanceof UserPrimaryKey != true)
 *         throw new ClassCastException("oid is not instanceof mydomain.UserPrimaryKey");
 *     UserPrimaryKey o = (UserPrimaryKey) oid;
 *     o.zzz1 = fs.fetchYYY1Field(1);
 *     o.zzz2 = fs.fetchYYY2Field(2);
 * }
 * 
 * and for CompoundIdentity
 *  * public final void jdoCopyKeyFieldsToObjectId(PersistenceCapable.ObjectIdFieldSupplier fs, Object oid)
 * {
 *     if (fs == null)
 *         throw new IllegalArgumentException("ObjectIdFieldSupplier is null");
 *     if (oid instanceof UserPrimaryKey != true)
 *         throw new ClassCastException("oid is not instanceof mydomain.UserPrimaryKey");
 *     UserPrimaryKey o = (UserPrimaryKey) oid;
 *     o.zzz1 = fs.fetchYYYField(1);
 *     o.zzz2 = ((YYY2.Key)JDOHelper.getObjectId((YYY2)fs.fetchObjectField(2)));
 * }
 * 
 */
public class JdoCopyKeyFieldsToObjectId2 extends ASMClassMethod
{
    public static JdoCopyKeyFieldsToObjectId2 getInstance(ASMClassEnhancer enhancer)
    {
        return new JdoCopyKeyFieldsToObjectId2(enhancer, enhancer.getCopyKeyFieldsToObjectIdMethodName(),
            Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL,
            null, new Class[] {enhancer.getObjectIdFieldSupplierClass(), Object.class}, new String[] { "fs", "oid" });
    }

    /**
     * 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 JdoCopyKeyFieldsToObjectId2(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();

        ClassMetaData cmd = enhancer.getClassMetaData();
        if (cmd.getIdentityType() == IdentityType.APPLICATION)
        {
            // application identity
            String objectIdClass = cmd.getObjectidClass();
            String ACN_objectIdClass = objectIdClass.replace('.', '/');
            if (enhancer.getMetaDataManager().getApiAdapter().isSingleFieldIdentityClass(objectIdClass))
            {
                // SingleFieldIdentity
                Label startLabel = new Label();
                visitor.visitLabel(startLabel);

                visitor.visitTypeInsn(Opcodes.NEW, enhancer.getFatalInternalExceptionAsmClassName());
                visitor.visitInsn(Opcodes.DUP);
                visitor.visitLdcInsn("It's illegal to call jdoCopyKeyFieldsToObjectId for a class with SingleFieldIdentity.");
                visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, enhancer.getFatalInternalExceptionAsmClassName(), "", "(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(argNames[0], ASMUtils.CD_Object, null, startLabel, endLabel, 1);
                visitor.visitMaxs(3, 2);
            }
            else
            {
                // User-provided app identity, and compound identity
                Label l0 = new Label();
                Label l1 = new Label();
                Label l2 = new Label();
                visitor.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");

                Label startLabel = new Label();
                visitor.visitLabel(startLabel);

                visitor.visitVarInsn(Opcodes.ALOAD, 1);
                Label l4 = new Label();
                visitor.visitJumpInsn(Opcodes.IFNONNULL, l4);
                visitor.visitTypeInsn(Opcodes.NEW, "java/lang/IllegalArgumentException");
                visitor.visitInsn(Opcodes.DUP);
                visitor.visitLdcInsn("ObjectIdFieldSupplier is null");
                visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/IllegalArgumentException",
                    "", "(Ljava/lang/String;)V");
                visitor.visitInsn(Opcodes.ATHROW);

                visitor.visitLabel(l4);
                visitor.visitVarInsn(Opcodes.ALOAD, 2);
                visitor.visitTypeInsn(Opcodes.INSTANCEOF, ACN_objectIdClass);
                Label l5 = new Label();
                visitor.visitJumpInsn(Opcodes.IFNE, l5);
                visitor.visitTypeInsn(Opcodes.NEW, "java/lang/ClassCastException");
                visitor.visitInsn(Opcodes.DUP);
                visitor.visitLdcInsn("oid is not instanceof " + objectIdClass);
                visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/ClassCastException",
                    "", "(Ljava/lang/String;)V");
                visitor.visitInsn(Opcodes.ATHROW);

                visitor.visitLabel(l5);
                visitor.visitVarInsn(Opcodes.ALOAD, 2);
                visitor.visitTypeInsn(Opcodes.CHECKCAST, ACN_objectIdClass);
                visitor.visitVarInsn(Opcodes.ASTORE, 3);

                visitor.visitLabel(l0);

                // Copy the PK members using the appropriate method for each field/property
                int[] pkFieldNums = enhancer.getClassMetaData().getPKMemberPositions();
                Label reflectionFieldStart = null;
                for (int i=0;i