// Copyright 2007, 2008 The Apache Software Foundation

 //

 // Licensed 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.tapestry5.grid;

 import org.apache.tapestry5.beaneditor.BeanModel;

 /**

  * A provider of model data to the sub-components of the {@link org.apache.tapestry5.corelib.components.Grid} component.

  * The primary implementor of this component is the Grid component itself. This is effectively a way to package three

  * values as a single parameter to components such as {@link org.apache.tapestry5.corelib.components.GridColumns} and

  * {@link org.apache.tapestry5.corelib.components.GridRows}.

  */

 public interface GridModel

 {

     /**

      * Returns the data model, which defines the columns (in terms of properties of the row type), and provides access

      * to actual values for a given row instance.

      */

     BeanModel getDataModel();

     /**

      * Returns the source for the data to be presented in the Grid.

      */

     GridDataSource getDataSource();

     /**

      * Returns the object used to track sorting behavior of the Grid.

      */

     GridSortModel getSortModel();

 }