net.enilink.composition.asm.processors.BehaviourInterfaceImplementor.java Source code

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Here is the source code for net.enilink.composition.asm.processors.BehaviourInterfaceImplementor.java

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/*******************************************************************************
 * Copyright (c) 2010 Fraunhofer IWU and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Fraunhofer IWU - initial API and implementation
 *******************************************************************************/
package net.enilink.composition.asm.processors;

import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.MethodNode;
import net.enilink.composition.asm.BehaviourClassNode;
import net.enilink.composition.asm.BehaviourClassProcessor;
import net.enilink.composition.asm.Types;
import net.enilink.composition.asm.util.MethodNodeGenerator;
import net.enilink.composition.traits.Behaviour;

/**
 * Creates the byte code to implement the {@link Behaviour} interface.
 */
public class BehaviourInterfaceImplementor implements BehaviourClassProcessor, Opcodes, Types {
    @Override
    @SuppressWarnings("unchecked")
    public void process(BehaviourClassNode classNode) throws Exception {
        // add Behaviour interface if not already present
        if (!Behaviour.class.isAssignableFrom(classNode.getParentClass())) {
            classNode.addInterface(BEHAVIOUR_TYPE.getInternalName());
        }

        MethodNode mn = new MethodNode(ACC_PUBLIC | ACC_TRANSIENT, Behaviour.GET_ENTITY_METHOD,
                Type.getMethodDescriptor(OBJECT_TYPE, new Type[0]), null, null);

        MethodNodeGenerator gen = new MethodNodeGenerator(mn);
        gen.loadThis();
        gen.getField(classNode.getType(), "_$bean", OBJECT_TYPE);
        gen.returnValue();
        gen.endMethod();

        classNode.methods.add(mn);
    }

    @Override
    public boolean implementsClass(Class<?> behaviourClass) {
        return false;
    }
}