/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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 javax.faces.model;

 import java.util.ArrayList;

 import java.util.List;

 import org.seasar.framework.util.AssertionUtil;

 /**

  * @author shot

  */

 public abstract class DataModel {

     private List listeners = null;

     public DataModel() {

         listeners = new ArrayList();

     }

     public abstract int getRowCount();

     public abstract Object getRowData();

     public abstract int getRowIndex();

     public abstract Object getWrappedData();

     public abstract boolean isRowAvailable();

     public abstract void setRowIndex(int rowIndex);

     public abstract void setWrappedData(Object data);

     public void addDataModelListener(DataModelListener listener) {

         AssertionUtil.assertNotNull("listener", listener);

         listeners.add(listener);

     }

     public DataModelListener[] getDataModelListeners() {

         DataModelListener[] dataModelListeners = null;

         if (listeners == null) {

             dataModelListeners = new DataModelListener[0];

         } else {

             dataModelListeners = (DataModelListener[]) this.listeners

                     .toArray(new DataModelListener[this.listeners.size()]);

         }

         return dataModelListeners;

     }

     public void removeDataModelListener(DataModelListener listener) {

         AssertionUtil.assertNotNull("listener", listener);

         if (listeners != null) {

             listeners.remove(listener);

         }

     }

 }