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/**
 * Copyright (C) 2006  Robin Bygrave
 * 
 * This file is part of Ebean.
 * 
 * Ebean is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *  
 * Ebean is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Ebean; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA  
 */
package com.avaje.ebeaninternal.server.subclass;

import com.avaje.ebean.enhance.agent.ClassMeta;
import com.avaje.ebean.enhance.agent.EnhanceConstants;
import com.avaje.ebean.enhance.asm.ClassVisitor;
import com.avaje.ebean.enhance.asm.Label;
import com.avaje.ebean.enhance.asm.MethodVisitor;
import com.avaje.ebean.enhance.asm.Opcodes;

/**
 * Add a writeReplace method to support optional serialization to vanilla beans.
 * 
 * 
 * private Object writeReplace() throws ObjectStreamException {
 * 	return ebeanIntercept.writeReplaceIntercept();
 * }
 * 
 */
public class MethodWriteReplace implements Opcodes, EnhanceConstants {

	/**
	 * Add a writeReplace() method.
	 */
	public static void add(ClassVisitor cv, ClassMeta classMeta) {

		MethodVisitor mv = cv.visitMethod(ACC_PRIVATE, "writeReplace", "()Ljava/lang/Object;",
				null, new String[] { "java/io/ObjectStreamException" });

		mv.visitCode();
		Label l0 = new Label();
		mv.visitLabel(l0);
		mv.visitLineNumber(1, l0);
		mv.visitVarInsn(ALOAD, 0);
		mv.visitFieldInsn(GETFIELD, classMeta.getClassName(), INTERCEPT_FIELD, L_INTERCEPT);
		mv.visitMethodInsn(INVOKEVIRTUAL, C_INTERCEPT, "writeReplaceIntercept","()Ljava/lang/Object;");

		mv.visitInsn(ARETURN);
		Label l1 = new Label();
		mv.visitLabel(l1);
		mv.visitLocalVariable("this", "L"+classMeta.getClassName()+";", null, l0, l1, 0);
		mv.visitMaxs(0, 0);
		mv.visitEnd();

	}
}