/**
* Process this instruction
*
* @param context the dynamic context of the transformation
* @return a TailCall to be executed by the caller, always null for this instruction
*/
public TailCall processLeavingTail(XPathContext context) throws XPathException {
Controller controller = context.getController();
SequenceReceiver out = context.getReceiver();
int opt = options;
int ann = annotation;
// we may need to change the namespace prefix if the one we chose is
// already in use with a different namespace URI: this is done behind the scenes
// by the Outputter
CharSequence value = expandChildren(context);
if (schemaType != null) {
// test whether the value actually conforms to the given type
XPathException err =
schemaType.validateContent(
value,
DummyNamespaceResolver.getInstance(),
context.getConfiguration().getNameChecker());
if (err != null) {
ValidationException verr =
new ValidationException(
"Attribute value "
+ Err.wrap(value, Err.VALUE)
+ " does not the match the required type "
+ schemaType.getDescription()
+ ". "
+ err.getMessage());
verr.setErrorCode("XTTE1540");
verr.setLocator(this);
throw verr;
}
} else if (validationAction == Validation.STRICT || validationAction == Validation.LAX) {
try {
ann = controller.getConfiguration().validateAttribute(nameCode, value, validationAction);
} catch (ValidationException e) {
DynamicError err = DynamicError.makeDynamicError(e);
String errorCode = e.getErrorCodeLocalPart();
if (errorCode == null) {
errorCode = (validationAction == Validation.STRICT ? "XTTE1510" : "XTTE1515");
}
err.setErrorCode(errorCode);
err.setXPathContext(context);
err.setLocator(this);
err.setIsTypeError(true);
throw err;
}
}
try {
out.attribute(nameCode, ann, value, locationId, opt);
} catch (XPathException err) {
throw dynamicError(this, err, context);
}
return null;
}
/** Enumerate the results of the expression */
public SequenceIterator iterate(XPathContext context) throws XPathException {
Controller controller = context.getController();
Item arg2;
try {
arg2 = argument[2].evaluateItem(context);
} catch (XPathException e) {
if ("XPDY0002".equals(e.getErrorCodeLocalPart())) {
dynamicError(
"Cannot call the key() function when there is no context item", "XTDE1270", context);
return null;
} else if ("XPDY0050".equals(e.getErrorCodeLocalPart())) {
dynamicError(
"In the key() function,"
+ " the node supplied in the third argument (or the context node if absent)"
+ " must be in a tree whose root is a document node",
"XTDE1270",
context);
return null;
} else if ("XPTY0020".equals(e.getErrorCodeLocalPart())) {
dynamicError(
"Cannot call the key() function when the context item is an atomic value",
"XTDE1270",
context);
return null;
}
throw e;
}
NodeInfo origin = (NodeInfo) arg2;
NodeInfo root = origin.getRoot();
if (root.getNodeKind() != Type.DOCUMENT) {
dynamicError(
"In the key() function,"
+ " the node supplied in the third argument (or the context node if absent)"
+ " must be in a tree whose root is a document node",
"XTDE1270",
context);
return null;
}
DocumentInfo doc = (DocumentInfo) root;
int fprint = keyFingerprint;
if (fprint == -1) {
String givenkeyname = argument[0].evaluateItem(context).getStringValue();
try {
fprint =
controller
.getNamePool()
.allocateLexicalQName(
givenkeyname,
false,
nsContext,
controller.getConfiguration().getNameChecker())
& NamePool.FP_MASK;
} catch (XPathException err) {
dynamicError("Invalid key name: " + err.getMessage(), "XTDE1260", context);
}
if (fprint == -1) {
dynamicError("Key '" + givenkeyname + "' has not been defined", "XTDE1260", context);
return null;
}
}
// if (internal) {
// System.err.println("Using key " + fprint + " on doc " + doc);
// }
// If the second argument is a singleton, we evaluate the function
// directly; otherwise we recurse to evaluate it once for each Item
// in the sequence.
Expression expression = argument[1];
SequenceIterator allResults;
if (Cardinality.allowsMany(expression.getCardinality())) {
final XPathContext keyContext = context;
final DocumentInfo document = doc;
final KeyManager keyManager = controller.getKeyManager();
MappingFunction map =
new MappingFunction() {
// Map a value to the sequence of nodes having that value as a key value
public Object map(Item item) throws XPathException {
return keyManager.selectByKey(
keyFingerprint, document, (AtomicValue) item, keyContext);
}
};
SequenceIterator keys = argument[1].iterate(context);
SequenceIterator allValues = new MappingIterator(keys, map);
allResults = new DocumentOrderIterator(allValues, LocalOrderComparer.getInstance());
} else {
try {
AtomicValue keyValue = (AtomicValue) argument[1].evaluateItem(context);
if (keyValue == null) {
return EmptyIterator.getInstance();
}
KeyManager keyManager = controller.getKeyManager();
allResults = keyManager.selectByKey(fprint, doc, keyValue, context);
} catch (XPathException e) {
if (e.getLocator() == null) {
e.setLocator(this);
}
throw e;
}
}
if (origin == doc) {
return allResults;
}
SubtreeFilter filter = new SubtreeFilter();
filter.origin = origin;
return new ItemMappingIterator(allResults, filter);
}
