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package javax.faces.model;
import java.util.List;
import javax.faces.FacesException;
/**
* ListDataModel is a convenience implementation of
* {@link DataModel} that wraps an List of Java objects.
*/
public class ListDataModel extends DataModel {
// ------------------------------------------------------------ Constructors
/**
* Construct a new {@link ListDataModel} with no specified
* wrapped data.
*/
public ListDataModel() {
this(null);
}
/**
* Construct a new {@link ListDataModel} wrapping the specified
* list.
*
* @param list List to be wrapped (if any)
*/
public ListDataModel(List list) {
super();
setWrappedData(list);
}
// ------------------------------------------------------ Instance Variables
// The current row index (zero relative)
private int index = -1;
// The list we are wrapping
private List list;
// -------------------------------------------------------------- Properties
/**
* Return true if there is wrappedData
* available, and the current value of rowIndex is greater
* than or equal to zero, and less than the size of the list. Otherwise,
* return false.
*
* @throws FacesException if an error occurs getting the row availability
*/
public boolean isRowAvailable() {
if (list == null) {
return (false);
} else if ((index >= 0) && (index < list.size())) {
return (true);
} else {
return (false);
}
}
/**
* If there is wrappedData available, return the
* length of the list. If no wrappedData is available,
* return -1.
*
* @throws FacesException if an error occurs getting the row count
*/
public int getRowCount() {
if (list == null) {
return (-1);
}
return (list.size());
}
/**
* If row data is available, return the array element at the index
* specified by rowIndex. If no wrapped data is available,
* return null.
*
* @throws FacesException if an error occurs getting the row data
* @throws IllegalArgumentException if now row data is available
* at the currently specified row index
*/
public E getRowData() {
if (list == null) {
return (null);
} else if (!isRowAvailable()) {
throw new NoRowAvailableException();
} else {
return ((E) list.get(index));
}
}
/**
* @throws FacesException {@inheritDoc}
*/
public int getRowIndex() {
return (index);
}
/**
* @throws FacesException {@inheritDoc}
* @throws IllegalArgumentException {@inheritDoc}
*/
public void setRowIndex(int rowIndex) {
if (rowIndex < -1) {
throw new IllegalArgumentException();
}
int old = index;
index = rowIndex;
if (list == null) {
return;
}
DataModelListener [] listeners = getDataModelListeners();
if ((old != index) && (listeners != null)) {
Object rowData = null;
if (isRowAvailable()) {
rowData = getRowData();
}
DataModelEvent event =
new DataModelEvent(this, index, rowData);
int n = listeners.length;
for (int i = 0; i < n; i++) {
if (null != listeners[i]) {
listeners[i].rowSelected(event);
}
}
}
}
public Object getWrappedData() {
return (this.list);
}
/**
* @throws ClassCastException if data is
* non-null and is not a List
*/
public void setWrappedData(Object data) {
if (data == null) {
list = null;
setRowIndex(-1);
} else {
list = (List) data;
index = -1;
setRowIndex(0);
}
}
}