/*
* Copyright 2004 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 javax.faces.model;
/**
* see Javadoc of <a href="http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/api/index.html">JSF Specification</a>
*
* @author Thomas Spiegl (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public class ScalarDataModel extends DataModel
{
// FIELDS
private int _rowIndex = -1;
private Object _data;
// CONSTRUCTORS
public ScalarDataModel()
{
super();
}
public ScalarDataModel(Object scalar)
{
setWrappedData(scalar);
}
// METHODS
public int getRowCount()
{
return _data != null ? 1 : -1;
}
public Object getRowData()
{
if (_data == null)
{
return null;
}
if (!isRowAvailable())
{
throw new IllegalArgumentException("row is unavailable");
}
return _data;
}
public int getRowIndex()
{
return _rowIndex;
}
public Object getWrappedData()
{
return _data;
}
public boolean isRowAvailable()
{
if (_data == null)
{
return false;
}
return _rowIndex == 0;
}
public void setRowIndex(int rowIndex)
{
if (rowIndex < -1)
{
throw new IllegalArgumentException("illegal rowIndex " + rowIndex);
}
int oldRowIndex = _rowIndex;
_rowIndex = rowIndex;
if (_data != null && oldRowIndex != _rowIndex)
{
Object data = isRowAvailable() ? getRowData() : null;
DataModelEvent event = new DataModelEvent(this, _rowIndex, data);
DataModelListener[] listeners = getDataModelListeners();
for (int i = 0; i < listeners.length; i++)
{
listeners[i].rowSelected(event);
}
}
}
public void setWrappedData(Object data)
{
_data = data;
int rowIndex = _data != null ? 0 : -1;
setRowIndex(rowIndex);
}
}