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package javax.faces.model;
/**
* <p><strong>ScalarDataModel</strong> is a convenience implementation of
* {@link DataModel} that wraps an individual Java object.</p>
*/
public class
ScalarDataModel<E> extends
DataModel<E> {
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a new {@link ScalarDataModel} with no specified
* wrapped data.</p>
*/
public
ScalarDataModel() {
this(null);
}
/**
* <p>Construct a new {@link ScalarDataModel} wrapping the specified
* scalar object.</p>
*
* @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
/**
* <p>Return <code>true</code> if there is <code>wrappedData</code>
* available, and the current value of <code>rowIndex</code> is zero.
* Otherwise, return <code>false</code>.</p>
*
* @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);
}
}
/**
* <p>If there is <code>wrappedData</code> available, return 1.
* If no <code>wrappedData</code> is available, return -1.</p>
*
* @throws FacesException if an error occurs getting the row count
*/
public int
getRowCount() {
if (
scalar == null) {
return (-1);
}
return (1);
}
/**
* <p>If wrapped data is available, return the wrapped data instance.
* Otherwise, return <code>null</code>.</p>
*
* @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);
}
}
}