1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.view.facelets.el;
20
21 import java.util.regex.Pattern;
22
23 import javax.faces.context.FacesContext;
24 import javax.faces.view.Location;
25
26 /**
27 * Utility class when used in EL Expressions --> #{resource}
28 *
29 * @author Leonardo Uribe
30 */
31 public class ResourceELUtils
32 {
33
34 // TODO: check this expression, maybe we can make it simpler, because "resource" implicit object
35 // cannot be preceded by anything.
36 public static final Pattern RESOURCE_EXPRESSION_REGEX = Pattern.compile(".*[^\\w\\.]resource[^\\w].*");
37
38 private static final String RESOURCE = "resource";
39
40 public static final String RESOURCE_LOCATION_KEY = "org.apache.myfaces.view.facelets.resource.location";
41
42 public static boolean isResourceExpression(String expression)
43 {
44 if (expression.contains(RESOURCE))
45 {
46 return RESOURCE_EXPRESSION_REGEX.matcher(expression).matches();
47 }
48 else
49 {
50 return false;
51 }
52 }
53
54 public static Location getResourceLocationForResolver(FacesContext facesContext)
55 {
56 return (Location) facesContext.getAttributes().get(RESOURCE_LOCATION_KEY);
57 }
58
59 public static void saveResourceLocationForResolver(FacesContext facesContext, Location location)
60 {
61 facesContext.getAttributes().put(RESOURCE_LOCATION_KEY, location);
62 }
63
64 public static void removeResourceLocationForResolver(FacesContext facesContext)
65 {
66 facesContext.getAttributes().remove(RESOURCE_LOCATION_KEY);
67 }
68 }