1 /*
2 * $Id: JspExpressionFactoryFactory.java 1229087 2012-01-09 10:35:14Z mck $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 package org.apache.tiles.el;
23
24 import javax.el.ExpressionFactory;
25 import javax.servlet.ServletContext;
26 import javax.servlet.jsp.JspFactory;
27
28 import org.apache.tiles.request.ApplicationContext;
29 import org.apache.tiles.request.ApplicationContextAware;
30
31 /**
32 * Uses the JSP 2.1 {@link ExpressionFactory} to be used in Tiles.
33 *
34 * @version $Rev: 1229087 $ $Date: 2012-01-09 21:35:14 +1100 (Mon, 09 Jan 2012) $
35 * @since 2.2.1
36 */
37 public class JspExpressionFactoryFactory implements ExpressionFactoryFactory,
38 ApplicationContextAware {
39
40 /**
41 * The servlet context.
42 *
43 * @since 2.2.1
44 */
45 protected ServletContext servletContext;
46
47 /** {@inheritDoc} */
48 public void setApplicationContext(ApplicationContext applicationContext) {
49 Object context = applicationContext.getContext();
50 if (context instanceof ServletContext) {
51 this.servletContext = (ServletContext) context;
52 } else {
53 throw new IllegalArgumentException(
54 "The application context does not hold an instance of "
55 + "ServletContext, consider using JuelExpressionFactoryFactory");
56 }
57 }
58
59 /** {@inheritDoc} */
60 public ExpressionFactory getExpressionFactory() {
61 return JspFactory.getDefaultFactory().getJspApplicationContext(
62 servletContext).getExpressionFactory();
63 }
64 }