package net.sf.saxon.functions;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.*;
import net.sf.saxon.sort.IntIterator;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.BuiltInAtomicType;
import net.sf.saxon.value.StringValue;
/**
* This class supports fuctions get-in-scope-prefixes()
*/
public class InScopePrefixes extends SystemFunction {
/**
* Iterator over the results of the expression
*/
public SequenceIterator iterate(final XPathContext context) throws XPathException {
final NodeInfo element = (NodeInfo)argument[0].evaluateItem(context);
final IntIterator iter = NamespaceCodeIterator.iterateNamespaces(element);
final NamePool pool = context.getNamePool();
return new SequenceIterator() {
private Item current = null;
private int position = 0;
public Item current() {
return current;
}
public SequenceIterator getAnother() throws XPathException {
return iterate(context);
}
public int getProperties() {
return 0;
}
public Item next() throws XPathException {
if (position == 0) {
current = new StringValue("xml");
position++;
return current;
} else if (iter.hasNext()) {
String prefix = pool.getPrefixFromNamespaceCode(iter.next());
if (prefix.length() == 0) {
current = StringValue.EMPTY_STRING;
} else {
current = StringValue.makeRestrictedString(
prefix, BuiltInAtomicType.NCNAME, null).asAtomic();
}
position++;
return current;
} else {
current = null;
position = -1;
return null;
}
}
public int position() {
return position;
}
public void close() {
}
};
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//