core/runtime/src/main/java/org/qi4j/runtime/composite/ProxyReferenceInvocationHandler.java

/*
 * Copyright (c) 2007, Rickard Öberg. All Rights Reserved.
 * Copyright (c) 2007, Niclas Hedhman. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package org.qi4j.runtime.composite;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.UndeclaredThrowableException;
import org.qi4j.api.composite.CompositeInvoker;

public final class ProxyReferenceInvocationHandler
    implements InvocationHandler, CompositeInvoker
{
    private Object proxy;

    public Object proxy()
    {
        return proxy;
    }

    public void setProxy( Object proxy )
    {
        this.proxy = proxy;
    }

    public void clearProxy()
    {
        proxy = null;
    }

    @Override
    public Object invokeComposite( Method method, Object[] args )
        throws Throwable
    {
        try
        {
            InvocationHandler invocationHandler = Proxy.getInvocationHandler( this.proxy );
            return invocationHandler.invoke( this.proxy, method, args );
        }
        catch( InvocationTargetException e )
        {
            throw e.getTargetException();
        }
        catch( UndeclaredThrowableException e )
        {
            throw e.getUndeclaredThrowable();
        }
    }

    @Override
    public Object invoke( Object proxy, Method method, Object[] args )
        throws Throwable
    {
        try
        {
            InvocationHandler invocationHandler = Proxy.getInvocationHandler( this.proxy );
            return invocationHandler.invoke( this.proxy, method, args );
        }
        catch( InvocationTargetException e )
        {
            throw e.getTargetException();
        }
        catch( UndeclaredThrowableException e )
        {
            throw e.getUndeclaredThrowable();
        }
    }
}