private void runAdjacent() throws SaxonApiException {
TreeWriter treeWriter = null;
String last = null;
boolean open = false;
int count = 0;
while (source.moreDocuments()) {
count++;
source.read();
}
source.resetReader();
DocumentSequenceIterator xsi = new DocumentSequenceIterator(); // See below
xsi.setLast(count);
int pos = 0;
while (source.moreDocuments()) {
XdmNode node = source.read();
pos++;
Item item = null;
try {
XPathCompiler xcomp = runtime.getProcessor().newXPathCompiler();
xcomp.setBaseURI(step.getNode().getBaseURI());
for (String prefix : groupAdjacent.getNamespaceBindings().keySet()) {
xcomp.declareNamespace(prefix, groupAdjacent.getNamespaceBindings().get(prefix));
}
XPathExecutable xexec = xcomp.compile(groupAdjacent.getString());
// From Michael Kay: http://markmail.org/message/vkb2vaq2miylgndu
//
// Underneath the s9api XPathExecutable is a net.sf.saxon.sxpath.XPathExpression.
XPathExpression xexpr = xexec.getUnderlyingExpression();
// Call createDynamicContext() on this to get an XPathDynamicContext object;
XPathDynamicContext xdc = xexpr.createDynamicContext(node.getUnderlyingNode());
// call getXPathContextObject() on that to get the underlying XPathContext.
XPathContext xc = xdc.getXPathContextObject();
// Then call XPathContext.setCurrentIterator()
// to supply a SequenceIterator whose current() and position() methods return
// the context item and position respectively. If there's any risk that the
// expression will call the last() method, then it's simplest to make your
// iterator's getProperties() return LAST_POSITION_FINDER, and implement the
// LastPositionFinder interface, in which case last() will be implemented by
// calling the iterator's getLastPosition() method. (Otherwise last() is
// implemented by calling getAnother() to clone the iterator and calling next()
// on the clone until the end of the sequence is reached).
xsi.setPosition(pos);
xsi.setItem(node.getUnderlyingNode());
xc.setCurrentIterator(xsi);
// Then evaluate the expression by calling iterate() on the
// net.sf.saxon.sxpath.XPathExpression object.
SequenceIterator results = xexpr.iterate(xdc);
item = results.next();
if (item == null) {
throw new XProcException(
step.getNode(), "The group-adjacent expression returned nothing.");
}
if (results.next() != null) {
throw new XProcException(
step.getNode(), "Didn't expect group-adjacent to return a sequence!");
}
} catch (XPathException xe) {
throw new XProcException(xe);
}
//
// Good luck!
//
// FIXME: Compute effective boolean value in a more robust way
String cur = item.getStringValue();
if (last != null) {
if (last.equals(cur)) {
treeWriter.addSubtree(node);
} else {
if (open) {
open = false;
treeWriter.addEndElement();
treeWriter.endDocument();
result.write(treeWriter.getResult());
}
}
}
if (last == null || !last.equals(cur)) {
last = cur;
open = true;
treeWriter = new TreeWriter(runtime);
treeWriter.startDocument(step.getNode().getBaseURI());
treeWriter.addStartElement(wrapper);
treeWriter.startContent();
treeWriter.addSubtree(node);
}
}
if (open) {
open = false;
treeWriter.addEndElement();
treeWriter.endDocument();
result.write(treeWriter.getResult());
}
}
private List<?> processRow()
throws ExpressionEvaluationException, BlockedException, TeiidComponentException,
TeiidProcessingException {
List<Object> tuple = new ArrayList<Object>(projectedColumns.size());
for (XMLColumn proColumn : projectedColumns) {
if (proColumn.isOrdinal()) {
if (rowCount > Integer.MAX_VALUE) {
throw new TeiidRuntimeException(
new TeiidProcessingException(
QueryPlugin.Event.TEIID31174, QueryPlugin.Util.gs(QueryPlugin.Event.TEIID31174)));
}
tuple.add((int) rowCount);
} else {
try {
XPathExpression path = proColumn.getPathExpression();
XPathDynamicContext dynamicContext = path.createDynamicContext(item);
SequenceIterator pathIter = path.iterate(dynamicContext);
Item colItem = pathIter.next();
if (colItem == null) {
if (proColumn.getDefaultExpression() != null) {
tuple.add(
getEvaluator(Collections.emptyMap())
.evaluate(proColumn.getDefaultExpression(), null));
} else {
tuple.add(null);
}
continue;
}
if (proColumn.getSymbol().getType() == DataTypeManager.DefaultDataClasses.XML) {
XMLType value =
table
.getXQueryExpression()
.createXMLType(
pathIter.getAnother(), this.getBufferManager(), false, getContext());
tuple.add(value);
continue;
}
Item next = pathIter.next();
if (next != null) {
if (proColumn.getSymbol().getType().isArray()) {
ArrayList<Object> vals = new ArrayList<Object>();
vals.add(
getValue(
proColumn.getSymbol().getType().getComponentType(),
colItem,
this.table.getXQueryExpression().getConfig(),
getContext()));
vals.add(
getValue(
proColumn.getSymbol().getType().getComponentType(),
next,
this.table.getXQueryExpression().getConfig(),
getContext()));
while ((next = pathIter.next()) != null) {
vals.add(
getValue(
proColumn.getSymbol().getType().getComponentType(),
next,
this.table.getXQueryExpression().getConfig(),
getContext()));
}
Object value =
new ArrayImpl(
vals.toArray(
(Object[])
Array.newInstance(
proColumn.getSymbol().getType().getComponentType(),
vals.size())));
tuple.add(value);
continue;
}
throw new TeiidProcessingException(
QueryPlugin.Event.TEIID30171,
QueryPlugin.Util.gs(QueryPlugin.Event.TEIID30171, proColumn.getName()));
}
Object value =
getValue(
proColumn.getSymbol().getType(),
colItem,
this.table.getXQueryExpression().getConfig(),
getContext());
tuple.add(value);
} catch (XPathException e) {
throw new TeiidProcessingException(
QueryPlugin.Event.TEIID30172,
e,
QueryPlugin.Util.gs(QueryPlugin.Event.TEIID30172, proColumn.getName()));
}
}
}
item = null;
return tuple;
}
