com.ximpleware.xpath.UnaryExpr Maven / Gradle / Ivy
/*
* Copyright (C) 2002-2012 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.
*/
package com.ximpleware.xpath;
import com.ximpleware.*;
/**
* 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;
//cacheable =false;
}
final public String toString(){
return "-"+operand;
}
final public boolean evalBoolean(VTDNav vn){
return operand.evalBoolean(vn);
}
final public double evalNumber(VTDNav vn){ return -1*operand.evalNumber(vn);}
final public int evalNodeSet(VTDNav vn) throws XPathEvalException{
throw new XPathEvalException("UnaryExpr can't eval to a node set!");
}
final public String evalString(VTDNav vn){
double dval = operand.evalNumber(vn);
if (dval == (int) dval){
return ""+((int) dval);
}
return ""+dval;
}
final public void reset(VTDNav vn){
operand.reset(vn);
}
final public boolean isNodeSet(){
return false;
}
final public boolean isNumerical(){
return true;
}
final public boolean isString(){
return false;
}
final public boolean isBoolean(){
return false;
}
// to support computer context size
// needs to add
final public boolean requireContextSize(){
return operand.requireContextSize();
}
final public void setContextSize(int size){
operand.setContextSize(size);
}
final public void setPosition (int pos){
operand.setPosition(pos);
}
final public int adjust(int n){
return 0;
}
final public boolean isFinal(){
return operand.isFinal();
}
final public void markCacheable(){
operand.markCacheable();
}
final public void markCacheable2(){
operand.markCacheable2();
}
final public void clearCache(){
operand.clearCache();
}
}