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XimpleWare's VTD-XML is, far and away, the industry's most advanced and powerful XML processing model for SOA and Cloud Computing
/*
* Copyright (C) 2002-2015 XimpleWare, [email protected]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*VTD-XML is protected by US patent 7133857, 7260652, an 7761459*/
package com.ximpleware.extended.xpath;
import com.ximpleware.extended.*;
/**
* LocationPathExpr uses this class to represent a predicate
*
*/
public class Predicate implements LocationPathNode{
double d; // only supports a[1] style of location path for now
public int count;
public Expr expr;
public Predicate(){
nextP = (Predicate) null;
count = 0;
d = 0;
}
public boolean eval(VTDNavHuge vn) {
boolean b;
count++; // increment the position
expr.setPosition(count);
if (expr.isNumerical()){
b = (expr.evalNumber(vn)== count);
}
else{
b = expr.evalBoolean(vn);
}
return b;
}
public void setIndex(double index) throws XPathEvalExceptionHuge{
if (index<=0)
throw new XPathEvalExceptionHuge("Invalid index number");
d = (double) index;
}
public void reset(VTDNavHuge vn){
count = 0;
expr.reset(vn); // is this really needed?
}
public Predicate nextP;
public String toString(){
String s = "["+expr+"]";
if (nextP==null){
return s;
} else {
return s+nextP;
}
}
// to support computer context size
// needs to add
public boolean requireContextSize(){
return expr.requireContextSize();
}
public void setContextSize(int size){
expr.setContextSize(size);
}
public void adjust(int n){
expr.adjust(n);
}
}