org.eclipse.persistence.internal.dbws.SOAPResponseClassLoader Maven / Gradle / Ivy
Show all versions of eclipselink Show documentation
/*******************************************************************************
* Copyright (c) 1998, 2014 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:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.dbws;
// Javase imports
// Java extension imports
// EclipseLink imports
import org.eclipse.persistence.internal.libraries.asm.ClassWriter;
import org.eclipse.persistence.internal.libraries.asm.MethodVisitor;
import static org.eclipse.persistence.internal.libraries.asm.Opcodes.ACC_PUBLIC;
import static org.eclipse.persistence.internal.libraries.asm.Opcodes.ACC_SUPER;
import static org.eclipse.persistence.internal.libraries.asm.Opcodes.ALOAD;
import static org.eclipse.persistence.internal.libraries.asm.Opcodes.INVOKESPECIAL;
import static org.eclipse.persistence.internal.libraries.asm.Opcodes.RETURN;
import static org.eclipse.persistence.internal.libraries.asm.Opcodes.V1_5;
/**
* INTERNAL: A subclass of {@link ClassLoader} that exposes a build method to the hidden
* private {@link ClassLoader#defineClass} method.
*
* This loader is only used to define auto-generated subclasses of the {@link SOAPResponse}
* class; it should never be used to load actual existing classes.
*
* @author Mike Norman
*/
public class SOAPResponseClassLoader extends ClassLoader {
public static final String SOAP_RESPONSE_CLASSNAME_SLASHES =
SOAPResponse.class.getName().replace('.', '/');
public SOAPResponseClassLoader(ClassLoader parent) {
super(parent);
}
public Class buildClass(String className) {
byte[] data = generateClassBytes(className);
return super.defineClass(className, data, 0, data.length);
}
protected byte[] generateClassBytes(String className) {
/*
* Pattern is as follows:
* public class 'classname' extends org.eclipse.persistence.internal.dbws.SOAPResponse {
* public 'classname'() {
* super();
* }
* }
*/
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, className, null, SOAP_RESPONSE_CLASSNAME_SLASHES, null);
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "", "()V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, SOAP_RESPONSE_CLASSNAME_SLASHES, "", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
}