001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.taglib.faces.util;
016    
017    import com.liferay.portal.kernel.util.Validator;
018    
019    import javax.faces.application.Application;
020    import javax.faces.context.FacesContext;
021    import javax.faces.el.ValueBinding;
022    import javax.faces.webapp.UIComponentTag;
023    
024    /**
025     * @author Neil Griffin
026     */
027    public class JSFTagUtil {
028    
029            public static String eval(String expr) {
030                    if (Validator.isNotNull(expr) &&
031                            UIComponentTag.isValueReference(expr)) {
032    
033                            FacesContext facesContext = FacesContext.getCurrentInstance();
034    
035                            Application application = facesContext.getApplication();
036                            ValueBinding valueBinding = application.createValueBinding(expr);
037    
038                            expr = String.valueOf(valueBinding.getValue(facesContext));
039                    }
040    
041                    return expr;
042            }
043    
044    }