//$Id: MapDataModel.java 5372 2007-06-21 05:27:29Z gavin $
package org.jboss.seam.jsf;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.faces.model.DataModelEvent;
import javax.faces.model.DataModelListener;
/**
* A JSF DataModel for maps.
*
* @author Gavin King
*
*/
public class MapDataModel extends javax.faces.model.DataModel implements
Serializable
{
private static final long serialVersionUID = -4888962547222002402L;
private int rowIndex = -1;
private List<Map.Entry> entries;
public MapDataModel() {}
public MapDataModel(Map map)
{
if (map == null)
{
throw new IllegalArgumentException("null map data");
}
setWrappedData(map);
}
@Override
public int getRowCount()
{
if (entries == null)
{
return -1;
}
return entries.size();
}
/**
* Returns a Map.Entry
*/
@Override
public Object getRowData()
{
if (entries == null)
{
return null;
}
if ( !isRowAvailable() )
{
throw new IllegalArgumentException("row is unavailable");
}
return entries.get(rowIndex);
}
@Override
public int getRowIndex()
{
return rowIndex;
}
@Override
public Object getWrappedData()
{
return new AbstractMap()
{
@Override
public Set entrySet()
{
return new AbstractSet()
{
@Override
public Iterator iterator()
{
return entries.iterator();
}
@Override
public int size()
{
return entries.size();
}
};
}
};
}
@Override
public boolean isRowAvailable()
{
return entries!=null &&
rowIndex >= 0 &&
rowIndex < entries.size();
}
@Override
public void setRowIndex(int newRowIndex)
{
if (newRowIndex < -1)
{
throw new IllegalArgumentException("illegal rowIndex " + newRowIndex);
}
int oldRowIndex = rowIndex;
rowIndex = newRowIndex;
if (entries != null && oldRowIndex != newRowIndex)
{
Object data = isRowAvailable() ? getRowData() : null;
DataModelEvent event = new DataModelEvent(this, newRowIndex, data);
DataModelListener[] listeners = getDataModelListeners();
for (int i = 0; i < listeners.length; i++)
{
listeners[i].rowSelected(event);
}
}
}
@Override
public void setWrappedData(Object data)
{
entries = new ArrayList( ( (Map) data ).entrySet() );
int rowIndex = data != null ? 0 : -1;
setRowIndex(rowIndex);
}
private void writeObject(ObjectOutputStream oos) throws IOException
{
oos.writeInt(rowIndex);
oos.writeObject(entries);
}
private void readObject(ObjectInputStream ois) throws IOException,
ClassNotFoundException
{
rowIndex = ois.readInt();
entries = (List<Map.Entry>) ois.readObject();
}
}