1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.taglib.faces.util;
16  
17  import com.liferay.portal.kernel.util.Validator;
18  
19  import javax.faces.application.Application;
20  import javax.faces.context.FacesContext;
21  import javax.faces.el.ValueBinding;
22  import javax.faces.webapp.UIComponentTag;
23  
24  /**
25   * <a href="JSFTagUtil.java.html"><b><i>View Source</i></b></a>
26   *
27   * @author Neil Griffin
28   */
29  public class JSFTagUtil {
30  
31      public static String eval(String expr) {
32          if (Validator.isNotNull(expr) &&
33              UIComponentTag.isValueReference(expr)) {
34  
35              FacesContext facesContext = FacesContext.getCurrentInstance();
36  
37              Application application = facesContext.getApplication();
38              ValueBinding valueBinding = application.createValueBinding(expr);
39  
40              expr = String.valueOf(valueBinding.getValue(facesContext));
41          }
42  
43          return expr;
44      }
45  
46  }