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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.lib.jsf;
    20
    21  import java.util.ArrayList;
    22  import java.util.Collections;
    23  import java.util.List;
    24  import java.util.Map;
    25
    26  /**
    27   * Utility methods for configuring the behaviour of a JSF-based Orchestra installation.
    28   *
    29   * @since 1.1
    30   */
    31  public abstract class ConfigUtils
    32  {
    33      private static final String RH_KEY = ConfigUtils.class.getName() + ".RH";
    34
    35      static List getRequestHandlers(Map reqScope)
    36      {
    37          List rhl = (List) reqScope.get(RH_KEY);
    38          if (rhl != null)
    39          {
    40              return rhl;
    41          }
    42          else
    43          {
    44              return Collections.EMPTY_LIST;
    45          }
    46      }
    47
    48      /**
    49       * Can be called from a Filter or similar class in order to registed a
    50       * handler that should be run at the start of each request just
    51       * <i>after</i> the FacesContext object has been created, and at the end
    52       * of each request just <i>before</i> the FacesContext is released.
    53       */
    54      public static void registerRequestHandler(Map reqScope, RequestHandler rh)
    55      {
    56          List rhl = (List) reqScope.get(RH_KEY);
    57          if (rhl == null)
    58          {
    59              rhl = new ArrayList(1);
    60              reqScope.put(RH_KEY, rhl);
    61          }
    62          rhl.add(rh);
    63      }
    64  }