001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry.services;
016
017/**
018 * Cache of compiled OGNL expressions.
019 * 
020 * @author Howard M. Lewis Ship
021 * @since 4.0
022 */
023public interface ExpressionCache
024{
025    /**
026     * Returns the compiled form of the OGNL expression. 
027     * 
028     * @throws org.apache.hivemind.ApplicationRuntimeException if the expression is not valid
029     */
030    public Object getCompiledExpression(String expression);
031}