/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.myfaces.tobago.util;

import javax.faces.application.Application;

public enum FacesVersion {

  VERSION_11,
  VERSION_12,
  VERSION_20;

  private static FacesVersion currentVersion;

  static {
    try {
      Application.class.getMethod("getExpressionFactory");

      try {
        Application.class.getMethod("getExceptionHandler");

        currentVersion = VERSION_20;


      } catch (NoSuchMethodException e) {
        currentVersion = VERSION_12;
      }

    } catch (NoSuchMethodException e) {
      currentVersion = VERSION_11;
    }
  }

  /**
   * Does the JSF is version 1.2 or higher
   * @return Supports 1.2 or higher
   */
  public static boolean supports12() {
    return currentVersion == VERSION_12 || currentVersion == VERSION_20;
  }

  /**
   * Does the JSF is version 2.0 or higher
   * @return Supports 2.0 or higher
   */
  public static boolean supports20() {
    return currentVersion == VERSION_20;
  }
}
