001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *   http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package org.apache.myfaces.tobago.util;
021    
022    import javax.faces.application.Application;
023    
024    public enum FacesVersion {
025    
026      VERSION_11,
027      VERSION_12,
028      VERSION_20;
029    
030      private static FacesVersion currentVersion;
031    
032      static {
033        try {
034          Application.class.getMethod("getExpressionFactory");
035    
036          try {
037            Application.class.getMethod("getExceptionHandler");
038    
039            currentVersion = VERSION_20;
040    
041    
042          } catch (NoSuchMethodException e) {
043            currentVersion = VERSION_12;
044          }
045    
046        } catch (NoSuchMethodException e) {
047          currentVersion = VERSION_11;
048        }
049      }
050    
051      /**
052       * Does the JSF is version 1.2 or higher
053       * @return Supports 1.2 or higher
054       */
055      public static boolean supports12() {
056        return currentVersion == VERSION_12 || currentVersion == VERSION_20;
057      }
058    
059      /**
060       * Does the JSF is version 2.0 or higher
061       * @return Supports 2.0 or higher
062       */
063      public static boolean supports20() {
064        return currentVersion == VERSION_20;
065      }
066    }