/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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.
*
* This software 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 this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.invocation.proxy;
import java.lang.reflect.Method;
import org.jboss.classfilewriter.ClassMethod;
import org.jboss.classfilewriter.code.CodeAttribute;
/**
* A {@link MethodBodyCreator} that simply returns 0 or null depending on the methods return type
*
* @author Stuart Douglas
*
*/
public class DefaultMethodBodyCreator implements MethodBodyCreator {
/**
* The singleton instance.
*/
public static final DefaultMethodBodyCreator INSTANCE = new DefaultMethodBodyCreator();
private DefaultMethodBodyCreator() {
}
/** {@inheritDoc} */
@Override
public void overrideMethod(ClassMethod method, Method superclassMethod) {
CodeAttribute ca = method.getCodeAttribute();
Class<?> returnType = superclassMethod.getReturnType();
if (!returnType.isPrimitive()) {
ca.aconstNull();
} else if (returnType == double.class) {
ca.dconst(0);
} else if (returnType == float.class) {
ca.fconst(0);
} else if (returnType == long.class) {
ca.lconst(0);
} else if (returnType == void.class) {
// do nothing
} else {
ca.iconst(0);
}
ca.returnInstruction();
}
}