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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  }