/*
 * Copyright 2002,2004 The Apache Software Foundation.
 * 
 * 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.apache.commons.jexl.util.introspection;


/**
 *  Interface defining a 'getter'.  For uses when looking for resolution of
 *  property references
 *
 *       $foo.bar
 *
 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
 * @version $Id: VelPropertyGet.java,v 1.3 2004/02/28 13:45:22 yoavs Exp $
 */
public interface VelPropertyGet
{
    /**
     *  invocation method - called when the 'get action' should be
     *  preformed and a value returned
     */
    public Object invoke(Object o) throws Exception;

    /**
     *  specifies if this VelPropertyGet is cacheable and able to be
     *  reused for this class of object it was returned for
     *
     *  @return true if can be reused for this class, false if not
     */
    public boolean isCacheable();

    /**
     *  returns the method name used to return this 'property'
     */
    public String getMethodName();
}