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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19  package org.apache.myfaces.orchestra.viewController;
    20
    21  import org.apache.myfaces.orchestra.frameworkAdapter.FrameworkAdapter;
    22
    23  /**
    24   * Provides facility to look up the ViewControllerManager instance that is used by
    25   * Orchestra to invoke lifecycle methods on "controller beans" associated with the
    26   * current view.
    27   *
    28   * @since 1.3
    29   */
    30  public class ViewControllerManagerFactory
    31  {
    32      private final static ViewControllerManager DEFAULT_VCM = new DefaultViewControllerManager();
    33
    34      /**
    35       * Returns the singleton ViewControllerManager object.
    36       * <p>
    37       * If a bean with name "org.apache.myfaces.orchestra.viewController.ViewControllerManager" exists
    38       * then this is returned. This bean is expected to be a singleton.
    39       * <p>
    40       * Otherwise a singleton instance of {@link DefaultViewControllerManager} will be returned.
    41       */
    42      public static ViewControllerManager getInstance()
    43      {
    44          ViewControllerManager manager = (ViewControllerManager)
    45                  FrameworkAdapter.getCurrentInstance().getBean(ViewControllerManager.VIEW_CONTROLLER_MANAGER_NAME);
    46          if (manager != null)
    47          {
    48              return manager;
    49          }
    50
    51          return DEFAULT_VCM;
    52      }
    53  }