package org.pdf4j.saxon.functions;
import org.pdf4j.saxon.expr.Expression;
import org.pdf4j.saxon.expr.ExpressionVisitor;
import org.pdf4j.saxon.expr.PathMap;
import org.pdf4j.saxon.expr.XPathContext;
import org.pdf4j.saxon.om.Item;
import org.pdf4j.saxon.trans.XPathException;
import org.pdf4j.saxon.value.StringValue;
/**
* Implement XPath function string()
*/
public class StringFn extends SystemFunction {
/**
* Simplify and validate.
* This is a pure function so it can be simplified in advance if the arguments are known
* @param visitor an expression visitor
*/
public Expression simplify(ExpressionVisitor visitor) throws XPathException {
useContextItemAsDefault();
argument[0].setFlattened(true);
return simplifyArguments(visitor);
}
public PathMap.PathMapNodeSet addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodes) {
PathMap.PathMapNodeSet result = argument[0].addToPathMap(pathMap, pathMapNodes);
if (result != null) {
result.setAtomized();
}
return null;
}
/**
* Evaluate the function
*/
public Item evaluateItem(XPathContext c) throws XPathException {
Item arg = argument[0].evaluateItem(c);
if (arg==null) {
return StringValue.EMPTY_STRING;
} else {
return StringValue.makeStringValue(arg.getStringValueCS());
}
}
}
//
// 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.
//