package org.pdf4j.saxon.functions;
import org.pdf4j.saxon.expr.Expression;
import org.pdf4j.saxon.expr.ExpressionVisitor;
import org.pdf4j.saxon.expr.StaticProperty;
import org.pdf4j.saxon.expr.XPathContext;
import org.pdf4j.saxon.om.Item;
import org.pdf4j.saxon.trans.XPathException;
import org.pdf4j.saxon.type.ItemType;
import org.pdf4j.saxon.value.Int64Value;
public class Position extends SystemFunction {
/**
* preEvaluate: this method suppresses compile-time evaluation by doing nothing
* (because the value of the expression depends on the runtime context)
* @param visitor an expression visitor
*/
public Expression preEvaluate(ExpressionVisitor visitor) {
return this;
}
public Expression typeCheck(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {
if (contextItemType == null) {
XPathException err = new XPathException("The context for position() is undefined");
err.setErrorCode("XPDY0002");
err.setIsTypeError(true);
err.setLocator(this);
throw err;
}
return super.typeCheck(visitor, contextItemType);
}
/**
* Evaluate in a general context
*/
public Item evaluateItem(XPathContext c) throws XPathException {
return Int64Value.makeIntegerValue(c.getContextPosition());
}
/**
* Determine the intrinsic dependencies
*/
public int getIntrinsicDependencies() {
return StaticProperty.DEPENDS_ON_POSITION;
}
}
//
// 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.
//