package net.sf.saxon.functions;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.ExpressionVisitor;
import net.sf.saxon.expr.Literal;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.NameChecker;
import net.sf.saxon.om.QNameException;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.BuiltInAtomicType;
import net.sf.saxon.value.AtomicValue;
import net.sf.saxon.value.QNameValue;
/**
* This class supports the fn:QName() function (previously named fn:expanded-QName())
*/
public class QNameFn extends SystemFunction {
/**
* Pre-evaluate a function at compile time. Functions that do not allow
* pre-evaluation, or that need access to context information, can override this method.
* @param visitor an expression visitor
*/
public Expression preEvaluate(ExpressionVisitor visitor) throws XPathException {
try {
XPathContext early = visitor.getStaticContext().makeEarlyEvaluationContext();
final Item item1 = argument[1].evaluateItem(early);
final String lex = item1.getStringValue();
final Item item0 = argument[0].evaluateItem(early);
String uri;
if (item0 == null) {
uri = "";
} else {
uri = item0.getStringValue();
}
final NameChecker checker = visitor.getConfiguration().getNameChecker();
final String[] parts = checker.getQNameParts(lex);
// The QNameValue constructor does not check the prefix
if (parts[0].length() != 0 && !checker.isValidNCName(parts[0])) {
XPathException err = new XPathException("Malformed prefix in QName: '" + parts[0] + '\'');
err.setErrorCode("FOCA0002");
throw err;
}
return Literal.makeLiteral(
new QNameValue(parts[0], uri, parts[1], BuiltInAtomicType.QNAME, checker));
} catch (QNameException e) {
XPathException err = new XPathException(e.getMessage(), this);
err.setErrorCode("FOCA0002");
err.setLocator(this);
throw err;
} catch (XPathException err) {
err.maybeSetLocation(this);
throw err;
}
}
/**
* Evaluate the expression
*/
public Item evaluateItem(XPathContext context) throws XPathException {
AtomicValue arg0 = (AtomicValue)argument[0].evaluateItem(context);
String uri;
if (arg0 == null) {
uri = null;
} else {
uri = arg0.getStringValue();
}
try {
final String lex = argument[1].evaluateItem(context).getStringValue();
final NameChecker checker = context.getConfiguration().getNameChecker();
final String[] parts = checker.getQNameParts(lex);
// The QNameValue constructor does not check the prefix
if (parts[0].length() != 0 && !checker.isValidNCName(parts[0])) {
XPathException err = new XPathException("Malformed prefix in QName: '" + parts[0] + '\'');
err.setErrorCode("FORG0001");
throw err;
}
return new QNameValue(parts[0], uri, parts[1], BuiltInAtomicType.QNAME, checker);
} catch (QNameException e) {
dynamicError(e.getMessage(), "FOCA0002", context);
return null;
} catch (XPathException err) {
err.maybeSetLocation(this);
throw err;
}
}
}
//
// 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.
//
// Contributor(s):
//