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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.jsf;
    20
    21  import javax.faces.context.FacesContext;
    22  import javax.faces.el.EvaluationException;
    23  import javax.faces.el.VariableResolver;
    24
    25  import org.apache.myfaces.orchestra.viewController.ViewControllerManager;
    26  import org.apache.myfaces.orchestra.viewController.ViewControllerManagerFactory;
    27
    28  /**
    29   * Provides a way to access the viewController through the JSF expression language (EL)
    30   * using the special variable name <code>oxViewController</code>.
    31   */
    32  public class ViewControllerVariableResolver extends VariableResolver
    33  {
    34      private final static String VIEW_CONTROLLER_VARIABLE = "oxViewController";
    35
    36      private final VariableResolver original;
    37
    38      public ViewControllerVariableResolver(VariableResolver original)
    39      {
    40          this.original = original;
    41      }
    42
    43      public Object resolveVariable(FacesContext facesContext, String variableName) throws EvaluationException
    44      {
    45          if (VIEW_CONTROLLER_VARIABLE.equals(variableName))
    46          {
    47              ViewControllerManager manager = ViewControllerManagerFactory.getInstance();
    48              return manager.getViewController(facesContext.getViewRoot().getViewId());
    49          }
    50
    51          return original.resolveVariable(facesContext, variableName);
    52      }
    53  }