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Public API for the Apache MyFaces Trinidad project

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/*
 * 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.trinidad.model;

/**
 * A MenuModel objects represents the menu structure of a page or application.
 * The menu model should know how to go from the current viewId to a focus rowKey.
 * 
 * MenuModel extends TreeModel and adds a single method,
 * getFocusRowKey(), which returns the rowKey of the focus page for the current view id.
 * 

 * Work on modeling menus continues and it is very possible that this class
 * will change in a future release.
 *
 */
public abstract class MenuModel extends TreeModel
{
  /**
   * Gets the focus rowKey for the current viewId.
   * If there is no item
   * in focus, getFocusRowKey should return null.
   * 
   * The value returned from calling {@link #getRowKey} should remain the
   * same before and after calling getFocusRowKey().
   * Meaning initialPath and currPath should
   * always be equal in the following example
   * 

   *   Object initialPath = model.getRowKey();
   *   Object focusPath   = model.getFocusRowKey();
   *   Object currPath    = model.getRowKey();
   * 
   * 
   * @return the focus rowKey for the current viewId
   */
  public abstract Object getFocusRowKey();
}