001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
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    }