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/*
* Copyright (C) 2002-2016 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.*;
/**
* Parser use this class to represent Unary Expr
*
*/
public class UnaryExpr extends Expr {
public int op;
public Expr operand;
public UnaryExpr (int o, Expr e){
op = o;
operand = e;
}
public String toString(){
return "-"+operand;
}
public boolean evalBoolean(VTDNavHuge vn){
return operand.evalBoolean(vn);
}
public double evalNumber(VTDNavHuge vn){ return -1*operand.evalNumber(vn);}
public int evalNodeSet(VTDNavHuge vn) throws XPathEvalExceptionHuge{
throw new XPathEvalExceptionHuge("UnaryExpr can't eval to a node set!");
}
public String evalString(VTDNavHuge vn){
double dval = operand.evalNumber(vn);
if (dval == (int) dval){
return ""+((int) dval);
}
return ""+dval;
}
public void reset(VTDNavHuge vn){
operand.reset(vn);
}
public boolean isNodeSet(){
return false;
}
public boolean isNumerical(){
return true;
}
public boolean isString(){
return false;
}
public boolean isBoolean(){
return false;
}
// to support computer context size
// needs to add
public boolean requireContextSize(){
return operand.requireContextSize();
}
public void setContextSize(int size){
operand.setContextSize(size);
}
public void setPosition (int pos){
operand.setPosition(pos);
}
public int adjust(int n){
return 0;
}
}