public void run() throws SaxonApiException {
fine(null, "Running p:viewport " + step.getName());
XProcData data = runtime.getXProcData();
data.openFrame(this);
if (current == null) {
current = new Pipe(runtime);
}
RuntimeValue match = ((Viewport) step).getMatch();
String iport = "#viewport-source";
ReadablePipe vsource = null;
if (inputs.get(iport).size() != 1) {
throw XProcException.dynamicError(3);
} else {
vsource = inputs.get(iport).get(0);
}
XdmNode doc = vsource.read();
if (doc == null || vsource.moreDocuments()) {
throw XProcException.dynamicError(3);
}
matcher = new ProcessMatch(runtime, this);
// FIXME: Only do this if we really need to!
sequenceLength = matcher.count(doc, match, false);
runtime.getXProcData().setIterationSize(sequenceLength);
matcher.match(doc, match);
for (String port : inputs.keySet()) {
if (port.startsWith("|")) {
String wport = port.substring(1);
WritablePipe pipe = outputs.get(wport);
XdmNode result = matcher.getResult();
pipe.write(result);
finest(step.getNode(), "Viewport output copy from matcher to " + pipe);
}
}
}
