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package org.apache.velocity.runtime.parser.node;

/*
 * 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.    
 */

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.velocity.runtime.log.Log;

/**
 * Abstract class that is used to execute an arbitrary
 * method that is in introspected. This is the superclass
 * for the PutExecutor and SetPropertyExecutor.
 *
 * There really should be a superclass for this and AbstractExecutor (which should
 * be refactored to GetExecutor) because they differ only in the execute() method.
 *
 * @author Jason van Zyl
 * @author Geir Magnusson Jr.
 * @author Henning P. Schmiedehausen
 * @version $Id: SetExecutor.java 685685 2008-08-13 21:43:27Z nbubna $
 * @since 1.5
 */
public abstract class SetExecutor
{
    /** Class logger */
    protected Log log = null;

    /**
     * Method to be executed.
     */
    private Method method = null;

    /**
     * Execute method against context.
     * @param o
     * @param value
     * @return The result of the invocation.
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public abstract Object execute(Object o, Object value)
         throws IllegalAccessException, InvocationTargetException;

    /**
     * Tell whether the executor is alive by looking
     * at the value of the method.
     * @return True if the executor is alive.
     */
    public boolean isAlive()
    {
        return (method != null);
    }

    /**
     * @return The method to invoke.
     */
    public Method getMethod()
    {
        return method;
    }

    /**
     * @param method
     */
    protected void setMethod(final Method method)
    {
        this.method = method;
    }
}