public void doLoad(Widget frmModel, JXPathContext jctx) throws BindingException {
// (There should be a general widget type checker for all the bindings to use,
// coupled with a general informative exception class to throw if the widget is
// of the wrong type or null.)
Repeater repeater = (Repeater) selectWidget(frmModel, this.repeaterId);
if (repeater == null) {
String fullId = frmModel.getRequestParameterName();
if (fullId == null || fullId.length() == 0) {
fullId = "";
} else {
fullId = fullId + ".";
}
throw new RuntimeException(
"TempRepeaterJXPathBinding: Repeater \""
+ fullId
+ this.repeaterId
+ "\" does not exist ("
+ frmModel.getLocation()
+ ")");
}
// Start by clearing the repeater, if necessary.
if (this.clearOnLoad) {
repeater.clear();
}
// Find the location of the repeater data.
Pointer repeaterPointer = jctx.getPointer(this.repeaterPath);
// Check if there is data present.
//
// (Otherwise, should we check the leniency config option
// to decide whether to be silent or throw an exception?)
if (repeaterPointer != null) {
// Narrow to repeater context.
JXPathContext repeaterContext = jctx.getRelativeContext(repeaterPointer);
// Build a jxpath iterator for the repeater row pointers.
Iterator rowPointers = repeaterContext.iteratePointers(this.rowPath);
// Iterate through the rows of data.
int rowNum = 0;
while (rowPointers.hasNext()) {
// Get or create a row widget.
Repeater.RepeaterRow thisRow;
if (repeater.getSize() > rowNum) {
thisRow = repeater.getRow(rowNum);
} else {
thisRow = repeater.addRow();
}
rowNum++;
// Narrow to the row context.
Pointer rowPointer = (Pointer) rowPointers.next();
JXPathContext rowContext = repeaterContext.getRelativeContext(rowPointer);
// If virtual rows are requested, place a deep clone of the row data
// into a temporary node, and narrow the context to this virtual row.
//
// (A clone of the data is used to prevent modifying the source document.
// Otherwise, the appendChild method would remove the data from the source
// document. Is this protection worth the penalty of a deep clone?)
//
// (This implementation of virtual rows currently only supports DOM
// bindings, but could easily be extended to support other bindings.)
if (virtualRows) {
Node repeaterNode = (Node) repeaterPointer.getNode();
Node virtualNode = repeaterNode.getOwnerDocument().createElementNS(null, "virtual");
Node node = (Node) rowPointer.getNode();
Node clone = node.cloneNode(true);
Node fakeDocElement = node.getOwnerDocument().getDocumentElement().cloneNode(false);
virtualNode.appendChild(clone);
fakeDocElement.appendChild(virtualNode);
rowContext = JXPathContext.newContext(repeaterContext, fakeDocElement);
rowContext = rowContext.getRelativeContext(rowContext.getPointer("virtual"));
}
// Finally, perform the load row binding.
this.rowBinding.loadFormFromModel(thisRow, rowContext);
}
}
if (getLogger().isDebugEnabled()) getLogger().debug("done loading rows " + this);
}
