package net.sf.saxon.functions;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.Type;
import net.sf.saxon.value.BooleanValue;
/**
* This class supports the nilled() function
*/
public class Nilled extends SystemFunction {
/**
* Evaluate the function
*/
public Item evaluateItem(XPathContext c) throws XPathException {
NodeInfo node = (NodeInfo)argument[0].evaluateItem(c);
return getNilledProperty(node);
}
/**
* Determine whether a node has the nilled property
* @param node the node in question (if null, the function returns null)
* @return the value of the nilled accessor. Returns null for any node other than an
* element node. For an element node, returns true if the element has been validated and
* has an xsi:nil attribute whose value is true.
*/
public static BooleanValue getNilledProperty(NodeInfo node) {
// TODO: if the type annotation is ANYTYPE, we need to keep an extra bit to represent the nilled
// property: it will be set only if validation has been performed. A newly-constructed element using
// validation="preserve" has nilled=false even if xsi:nil = true
if (node==null || node.getNodeKind() != Type.ELEMENT) {
return null;
}
return BooleanValue.get(node.isNilled());
// int typeAnnotation = node.getTypeAnnotation();
// if (typeAnnotation == -1 || typeAnnotation == StandardNames.XDT_UNTYPED) {
// return BooleanValue.FALSE;
// }
// String val = node.getAttributeValue(StandardNames.XSI_NIL);
// if (val == null) {
// return BooleanValue.FALSE;
// }
// if (val.trim().equals("1") || val.trim().equals("true")) {
// return BooleanValue.TRUE;
// }
// return BooleanValue.FALSE;
}
/**
* Determine whether a node is nilled. Returns true if the value
* of the nilled property is true; false if the value is false or absent
*/
public static boolean isNilled(NodeInfo node) {
BooleanValue b = getNilledProperty(node);
return b != null && b.getBooleanValue();
}
}
//
// 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.
//