1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.taglib.faces.util;
21  
22  import com.liferay.portal.kernel.util.Validator;
23  
24  import javax.faces.application.Application;
25  import javax.faces.context.FacesContext;
26  import javax.faces.el.ValueBinding;
27  import javax.faces.webapp.UIComponentTag;
28  
29  /**
30   * <a href="JSFTagUtil.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Neil Griffin
33   *
34   */
35  public class JSFTagUtil {
36  
37      public static String eval(String expr) {
38          if (Validator.isNotNull(expr) &&
39              UIComponentTag.isValueReference(expr)) {
40  
41              FacesContext facesContext = FacesContext.getCurrentInstance();
42  
43              Application application = facesContext.getApplication();
44              ValueBinding valueBinding = application.createValueBinding(expr);
45  
46              expr = String.valueOf(valueBinding.getValue(facesContext));
47          }
48  
49          return expr;
50      }
51  
52  }