org.eclipse.persistence.internal.jpa.weaving.RestAdapterClassWriter Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright (c) 2012, 2013 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the 
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 
 * which accompanies this distribution. 
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at 
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     tware - initial API and implementation from Oracle TopLink
 ******************************************************************************/
package org.eclipse.persistence.internal.jpa.weaving;

import org.eclipse.persistence.dynamic.DynamicClassLoader;
import org.eclipse.persistence.dynamic.EclipseLinkClassWriter;
import org.eclipse.persistence.internal.libraries.asm.ClassWriter;
import org.eclipse.persistence.internal.libraries.asm.MethodVisitor;
import org.eclipse.persistence.internal.libraries.asm.Opcodes;

public class RestAdapterClassWriter implements EclipseLinkClassWriter, Opcodes {

    public static final String REFERENCE_ADAPTER_SHORT_SIGNATURE = "org/eclipse/persistence/jpa/rs/util/xmladapters/ReferenceAdapter";
    
    /**
     * creates a class name that can be used for a ReferenceAdapter subclass for the given
     * classname.
     * @param className
     * @return
     */
    public static String constructClassNameForReferenceAdapter(String className){
        String packageName = className.lastIndexOf('.') >= 0 ? className.substring(0, className.lastIndexOf('.')) : "";
        String shortClassName = className.lastIndexOf('.') >= 0 ? className.substring(className.lastIndexOf('.') + 1) : className;
        return packageName + "._" + shortClassName + "PersistenceRestAdapter";

    }
    
    protected String parentClassName;
    
    public RestAdapterClassWriter(String parentClassName){
        this.parentClassName = parentClassName;
    }
    
    public String getClassName(){
        return constructClassNameForReferenceAdapter(parentClassName);
    }
    
    public String getASMParentClassName(){
        return parentClassName.replace('.', '/');
    }
    
    public String getASMClassName(){
        return getClassName().replace('.', '/');
    }
    
    @Override
    public byte[] writeClass(DynamicClassLoader loader, String className)
            throws ClassNotFoundException {
        
        ClassWriter cw = new ClassWriter(0);
        cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, getASMClassName(), "L" + REFERENCE_ADAPTER_SHORT_SIGNATURE + ";", REFERENCE_ADAPTER_SHORT_SIGNATURE, null);

        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, REFERENCE_ADAPTER_SHORT_SIGNATURE, "", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
        
        mv = cw.visitMethod(ACC_PUBLIC, "", "(Ljava/lang/String;Lorg/eclipse/persistence/jpa/rs/PersistenceContext;)V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKESPECIAL, REFERENCE_ADAPTER_SHORT_SIGNATURE, "", "(Ljava/lang/String;Lorg/eclipse/persistence/jpa/rs/PersistenceContext;)V");        
        mv.visitInsn(RETURN);
        mv.visitMaxs(3, 3);
        mv.visitEnd();
        
        cw.visitEnd();
        
        return cw.toByteArray();
    }

    @Override
    public boolean isCompatible(EclipseLinkClassWriter writer) {
        return getParentClassName().equals(writer.getParentClassName());
    }

    @Override
    public Class getParentClass() {
        return null;
    }
    
    @Override
    public String getParentClassName() {
        return parentClassName;
    }
    
}