public void execute(
XFormsActionInterpreter actionInterpreter,
Element actionElement,
Scope actionScope,
boolean hasOverriddenContext,
Item overriddenContext) {
final IndentedLogger indentedLogger = actionInterpreter.indentedLogger();
final XFormsContainingDocument containingDocument = actionInterpreter.containingDocument();
final XFormsContextStack contextStack = actionInterpreter.actionXPathContext();
final String atAttribute = actionElement.attributeValue("at");
final String originAttribute = actionElement.attributeValue("origin");
final String contextAttribute = actionElement.attributeValue(XFormsConstants.CONTEXT_QNAME);
// Extension: allow position to be an AVT
final String resolvedPositionAttribute =
actionInterpreter.resolveAVT(actionElement, "position");
// Extension: xxf:default="true" AVT requires that recalculate apply default values on the
// inserted nodes.
final boolean setRequireDefaultValues =
"true"
.equals(
actionInterpreter.resolveAVT(
actionElement, XFormsConstants.XXFORMS_DEFAULTS_QNAME));
// "2. The Node Set Binding node-set is determined."
final List<Item> collectionToBeUpdated;
{
final BindingContext currentBindingContext = contextStack.getCurrentBindingContext();
collectionToBeUpdated =
currentBindingContext.newBind()
? currentBindingContext.nodeset()
: XFormsConstants.EMPTY_ITEM_LIST;
}
final boolean isEmptyNodesetBinding =
collectionToBeUpdated == null || collectionToBeUpdated.size() == 0;
// "1. The insert context is determined."
// "The insert action is terminated with no effect if [...] a. The context attribute is not
// given and the Node
// Set Binding node-set is the empty node-set."
if (contextAttribute == null && isEmptyNodesetBinding) {
if (indentedLogger.isDebugEnabled())
indentedLogger.logDebug("xf:insert", "context is empty, terminating");
return;
}
// Handle insert context (with @context attribute)
final Item insertContextItem;
if (hasOverriddenContext) {
// "If the result is an empty nodeset or not a nodeset, then the insert action is terminated
// with no effect. "
if (overriddenContext == null || !(overriddenContext instanceof NodeInfo)) {
if (indentedLogger.isDebugEnabled())
indentedLogger.logDebug(
"xf:insert", "overridden context is an empty nodeset or not a nodeset, terminating");
return;
} else {
insertContextItem = overriddenContext;
}
} else {
insertContextItem = contextStack.getCurrentBindingContext().getSingleItem();
}
// "The insert action is terminated with no effect if [...] b. The context attribute is given,
// the insert
// context does not evaluate to an element node and the Node Set Binding node-set is the empty
// node-set."
// NOTE: In addition we support inserting into a context which is a document node
if (contextAttribute != null
&& isEmptyNodesetBinding
&& !DataModel.isElement(insertContextItem)
&& !DataModel.isDocument(insertContextItem)) {
if (indentedLogger.isDebugEnabled())
indentedLogger.logDebug(
"xf:insert",
"insert context is not an element node and binding node-set is empty, terminating");
return;
}
// "3. The origin node-set is determined."
final List<Item> originObjects;
{
if (originAttribute == null) {
originObjects = null;
} else {
// There is an @origin attribute
// "If the origin attribute is given, the origin node-set is the result of the evaluation of
// the
// origin attribute in the insert context."
originObjects =
actionInterpreter.evaluateKeepItems(
actionElement, Collections.singletonList(insertContextItem), 1, originAttribute);
// "The insert action is terminated with no effect if the origin node-set is the empty
// node-set."
if (originObjects.size() == 0) {
if (indentedLogger.isDebugEnabled())
indentedLogger.logDebug("xf:insert", "origin node-set is empty, terminating");
return;
}
}
}
// "4. The insert location node is determined."
int insertionIndex;
{
if (isEmptyNodesetBinding) {
// "If the Node Set Binding node-set empty, then this attribute is ignored"
insertionIndex = 0;
} else if (atAttribute == null) {
// "If the attribute is not given, then the default is the size of the Node Set Binding
// node-set"
insertionIndex = collectionToBeUpdated.size();
} else {
// "a. The evaluation context node is the first node in document order from the Node Set
// Binding
// node-set, the context size is the size of the Node Set Binding node-set, and the context
// position is 1."
// "b. The return value is processed according to the rules of the XPath function round()"
final String insertionIndexString =
actionInterpreter.evaluateAsString(
actionElement, collectionToBeUpdated, 1, "round(" + atAttribute + ")");
// "c. If the result is in the range 1 to the Node Set Binding node-set size, then the
// insert
// location is equal to the result. If the result is non-positive, then the insert location
// is
// 1. Otherwise, the result is NaN or exceeds the Node Set Binding node-set size, so the
// insert
// location is the Node Set Binding node-set size."
// Don't think we will get NaN with XPath 2.0...
insertionIndex =
"NaN".equals(insertionIndexString)
? collectionToBeUpdated.size()
: Integer.parseInt(insertionIndexString);
// Adjust index to be in range
if (insertionIndex > collectionToBeUpdated.size())
insertionIndex = collectionToBeUpdated.size();
if (insertionIndex < 1) insertionIndex = 1;
}
}
final String normalizedPosition;
{
if (resolvedPositionAttribute == null) {
// Default value
normalizedPosition = "after";
} else if ("after".equals(resolvedPositionAttribute)
|| "before".equals(resolvedPositionAttribute)) {
// Specified value
normalizedPosition = resolvedPositionAttribute;
} else {
// Invalid value
if (indentedLogger.isInfoEnabled())
indentedLogger.logWarning(
"xf:insert",
"invalid position attribute, defaulting to \"after\"",
"value",
resolvedPositionAttribute);
normalizedPosition = "after";
}
}
doInsert(
containingDocument,
indentedLogger,
normalizedPosition,
collectionToBeUpdated,
(NodeInfo) insertContextItem,
originObjects,
insertionIndex,
true,
true,
setRequireDefaultValues);
}
