javax.faces.model.ScalarDataModel Maven / Gradle / Ivy
/*
* $Id: ScalarDataModel.java,v 1.20 2007/04/27 22:00:09 ofung Exp $
*/
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package javax.faces.model;
import javax.faces.FacesException;
/**
* ScalarDataModel is a convenience implementation of
* {@link DataModel} that wraps an individual Java object.
*/
public class ScalarDataModel extends DataModel {
// ------------------------------------------------------------ Constructors
/**
* Construct a new {@link ScalarDataModel} with no specified
* wrapped data.
*/
public ScalarDataModel() {
this(null);
}
/**
* Construct a new {@link ScalarDataModel} wrapping the specified
* scalar object.
*
* @param scalar Scalar to be wrapped (if any)
*/
public ScalarDataModel(E scalar) {
super();
setWrappedData(scalar);
}
// ------------------------------------------------------ Instance Variables
// The currently selected row index (zero-relative)
private int index;
// The scalar we are wrapping
private E scalar;
// -------------------------------------------------------------- Properties
/**
* Return true if there is wrappedData
* available, and the current value of rowIndex is zero.
* Otherwise, return false.
*
* @throws FacesException if an error occurs getting the row availability
*/
public boolean isRowAvailable() {
if (scalar == null) {
return (false);
} else if (index == 0) {
return (true);
} else {
return (false);
}
}
/**
* If there is wrappedData available, return 1.
* If no wrappedData is available, return -1.
*
* @throws FacesException if an error occurs getting the row count
*/
public int getRowCount() {
if (scalar == null) {
return (-1);
}
return (1);
}
/**
* If wrapped data is available, return the wrapped data instance.
* Otherwise, 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 (scalar == null) {
return (null);
} else if (!isRowAvailable()) {
throw new NoRowAvailableException();
} else {
//noinspection unchecked
return (scalar);
}
}
/**
* @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 (scalar == 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.scalar);
}
/**
* @throws ClassCastException {@inheritDoc}
*/
public void setWrappedData(Object data) {
if (data == null) {
scalar = null;
setRowIndex(-1);
} else {
scalar = (E) data;
index = -1;
setRowIndex(0);
}
}
}