/**
* Copyright (C) 2009 Authors
*
* 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.ebean.enhance.agent;
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;
/**
* Adds a default constructor for the cases when there is not one already defined.
*
* @author rbygrave
*
*/
public class DefaultConstructor {
/**
* Adds a default constructor.
*/
public static void add(ClassVisitor cw, ClassMeta classMeta) {
if (classMeta.isLog(3)) {
classMeta.log("... adding default constructor, super class: "+classMeta.getSuperClassName());
}
MethodVisitor underlyingMV = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
ConstructorAdapter mv = new ConstructorAdapter(underlyingMV, classMeta, "()V");
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(1, l0);
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, classMeta.getSuperClassName(), "<init>", "()V");
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLineNumber(2, l1);
mv.visitInsn(Opcodes.RETURN);
Label l2 = new Label();
mv.visitLabel(l2);
mv.visitLocalVariable("this", "L"+classMeta.getClassName()+";", null, l0, l2, 0);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
}