TargetInstanceProxyMethodHandler.java

package org.jboss.weld.interceptor.util.proxy;

import java.io.Serializable;
import java.lang.reflect.Method;

import org.jboss.weld.bean.proxy.MethodHandler;


/**
 * @author Marius Bogoevici
 */
public abstract class TargetInstanceProxyMethodHandler<T> implements MethodHandler, Serializable {
    private final T targetInstance;

    private final Class<? extends T> targetClass;

    public TargetInstanceProxyMethodHandler(T targetInstance, Class<? extends T> targetClass) {
        this.targetInstance = targetInstance;
        this.targetClass = targetClass;
    }

    public final Object invoke(Object self, Method thisMethod, Method proceed, Object[] args) throws Throwable {
        if (thisMethod.getDeclaringClass().equals(TargetInstanceProxy.class)) {
            if (thisMethod.getName().equals("getTargetInstance")) {
                return this.getTargetInstance();
            } else if (thisMethod.getName().equals("getTargetClass")) {
                return this.getTargetClass();
            } else {
                // we shouldn't arrive here
                return null;
            }
        } else {
            return doInvoke(self, thisMethod, proceed, args);
        }
    }

    protected abstract Object doInvoke(Object self, Method thisMethod, Method proceed, Object[] args) throws Throwable;

    public T getTargetInstance() {
        return targetInstance;
    }

    public Class<? extends T> getTargetClass() {
        return targetClass;
    }
}