/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.tuscany.core.wire;

import org.apache.tuscany.spi.wire.Interceptor;
import org.apache.tuscany.spi.wire.InvocationRuntimeException;
import org.apache.tuscany.spi.wire.Message;
import org.apache.tuscany.spi.wire.TargetInvoker;

/**
 * Serves as a tail interceptor on a target wire chain. This implementation dispatches to the target invoker passed
 * inside the wire message. Target invokers are passed from the source in order to allow for caching of target
 * instances.
 *
 * @version $Rev$ $Date$
 * @Deprecated
 * @see org.apache.tuscany.spi.wire.TargetInvoker
 */
public class InvokerInterceptor implements Interceptor {

    public InvokerInterceptor() {
    }

    public Message invoke(Message msg) throws InvocationRuntimeException {
        TargetInvoker invoker = msg.getTargetInvoker();
        if (invoker == null) {
            throw new InvocationRuntimeException("No target invoker specified on message");
        }
        return invoker.invoke(msg);
    }

    public void setNext(Interceptor next) {
        throw new IllegalStateException("This interceptor must be the last one in an target interceptor chain");
    }

    public Interceptor getNext() {
        return null;
    }

    public boolean isOptimizable() {
        return true;
    }

}