/*
 * 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.container.script;

import java.lang.reflect.InvocationTargetException;

import org.apache.tuscany.spi.component.TargetException;
import org.apache.tuscany.spi.extension.TargetInvokerExtension;

/**
 * TargetInvoker implementation that calls a function on a ScriptInstanceImpl
 *
 * @version $Rev$ $Dev$
 */
public class ScriptTargetInvoker extends TargetInvokerExtension {

    protected ScriptComponent component;
    protected String functionName;

    public ScriptTargetInvoker(String functionName, ScriptComponent component) {
        super(null, null, null);
        this.functionName = functionName;
        this.component = component;
    }

    public Object invokeTarget(final Object payload, final short sequence) throws InvocationTargetException {
        ScriptInstance target;
        try {
            target = (ScriptInstance) component.getTargetInstance();
        } catch (TargetException e) {
            throw new InvocationTargetException(e);
        }
        try {
            return target.invokeTarget(functionName, (Object[]) payload);
        } catch (Exception e) {
            throw new InvocationTargetException(e);
        }
    }

}