package client.net.sf.saxon.ce.expr.sort;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.om.NodeInfo;
import client.net.sf.saxon.ce.om.SequenceIterator;
import client.net.sf.saxon.ce.pattern.Pattern;
import client.net.sf.saxon.ce.trans.XPathException;
import java.util.ArrayList;
/**
* A GroupStartingIterator iterates over a sequence of groups defined by
* xsl:for-each-group group-starting-with="x". The groups are returned in
* order of first appearance.
*/
public class GroupStartingIterator extends GroupMatchingIterator implements GroupIterator {
public GroupStartingIterator(SequenceIterator population, Pattern startPattern,
XPathContext context)
throws XPathException {
this.population = population;
this.pattern = startPattern;
baseContext = context;
runningContext = context.newMinorContext();
runningContext.setCurrentIterator(population);
// the first item in the population always starts a new group
next = population.next();
}
protected void advance() throws XPathException {
currentMembers = new ArrayList(10);
currentMembers.add(current);
while (true) {
NodeInfo nextCandidate = (NodeInfo)population.next();
if (nextCandidate == null) {
break;
}
if (pattern.matches(nextCandidate, runningContext)) {
next = nextCandidate;
return;
} else {
currentMembers.add(nextCandidate);
}
}
next = null;
}
public SequenceIterator getAnother() throws XPathException {
return new GroupStartingIterator(population.getAnother(), pattern, baseContext);
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.