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Jexl is an implementation of the JSTL Expression Language with extensions.
There is a newer version: 2.1.1
/*
 * 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.commons.jexl2.introspection;

import java.util.Iterator;
import java.lang.reflect.Constructor;
import org.apache.commons.jexl2.JexlInfo;

/**
 * 'Federated' introspection/reflection interface to allow the introspection
 * behavior in JEXL to be customized.
 * 
 * @since 1.0
 * @author Geir Magusson Jr.
 * @version $Id: Uberspect.java 896952 2010-01-07 18:21:29Z henrib $
 */
public interface Uberspect {
    /** Sets the class loader to use when getting a constructor with
     * a class name parameter.
     * @param loader the class loader
     */
    void setClassLoader(ClassLoader loader);

    /**
     * Returns a class constructor.
     * @param ctorHandle a class or class name
     * @param args constructor arguments
     * @param info contextual information
     * @return a {@link Constructor}
     */
    Constructor getConstructor(Object ctorHandle, Object[] args, JexlInfo info);
    /**
     * Returns a JexlMethod.
     * @param obj the object
     * @param method the method name
     * @param args method arguments
     * @param info contextual information
     * @return a {@link JexlMethod}
     */
    JexlMethod getMethod(Object obj, String method, Object[] args, JexlInfo info);

    /**
     * Property getter.
     * Returns JexlPropertyGet appropos for ${bar.woogie}.
     * @param obj the object to get the property from
     * @param identifier property name
     * @param info contextual information
     * @return a {@link JexlPropertyGet}
     */
    JexlPropertyGet getPropertyGet(Object obj, Object identifier, JexlInfo info);

    /**
     * Property setter.
     * 
returns JelPropertySet appropos for ${foo.bar = "geir"}.
     * @param obj the object to get the property from.
     * @param identifier property name
     * @param arg value to set
     * @param info contextual information
     * @return a {@link JexlPropertySet}.
     */
    JexlPropertySet getPropertySet(Object obj, Object identifier, Object arg, JexlInfo info);

    /**
     * Gets an iterator from an object.
     * @param obj to get the iterator for
     * @param info contextual information
     * @return an iterator over obj
     */
    Iterator getIterator(Object obj, JexlInfo info);

}