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/* Generated by Together */
package com.hp.hpl.sparta.xpath;
import java.io.*;
/**
* A utility that parses a stream of tokens and creates the
* appropriate sub-class of BooleanExpr.
Copyright (C) 2002 Hewlett-Packard Company.
This file is part of Sparta, an XML Parser, DOM, and XPath library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU
Lesser General Public License as published by the Free Software
Foundation; either version 2.1 of the License, or (at your option)
any later version. This library 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.
@version $Date: 2003/07/18 00:01:42 $ $Revision: 1.8 $
@author Eamonn O'Brien-Strain
* @stereotype factory */
public class ExprFactory {
/** @precondition current token is first token in expr production.
@postcondition current token is first token after expr production */
static BooleanExpr createExpr(XPath xpath, SimpleStreamTokenizer toks) throws XPathException,
IOException {
switch (toks.ttype) {
default:
throw new XPathException(xpath, "at beginning of expression", toks, "@, number, or text()");
case SimpleStreamTokenizer.TT_NUMBER:
int position = (int) toks.nval;
toks.nextToken();
return new PositionEqualsExpr(position);
case '@':
if (toks.nextToken() != SimpleStreamTokenizer.TT_WORD)
throw new XPathException(xpath, "after @", toks, "name");
String name = toks.sval;
String value;
int valueN;
switch (toks.nextToken()) {
case '=':
toks.nextToken();
if (toks.ttype != '\"' && toks.ttype != '\'')
throw new XPathException(xpath, "right hand side of equals", toks, "quoted string");
value = toks.sval;
toks.nextToken();
return new AttrEqualsExpr(name, value);
case '<':
toks.nextToken();
if (toks.ttype == '\"' || toks.ttype == '\'') {
// use jdk1.1 API to make the code work with PersonalJava
// valueN = Double.parseDouble(toks.sval);
valueN = Integer.parseInt(toks.sval);
} else if (toks.ttype == SimpleStreamTokenizer.TT_NUMBER)
valueN = toks.nval;
else
throw new XPathException(xpath, "right hand side of less-than", toks,
"quoted string or number");
toks.nextToken();
return new AttrLessExpr(name, valueN);
case '>':
toks.nextToken();
if (toks.ttype == '\"' || toks.ttype == '\'') {
// use jdk1.1 API to make the code work with PersonalJava
// valueN = Double.parseDouble(toks.sval);
valueN = Integer.parseInt(toks.sval);
} else if (toks.ttype == SimpleStreamTokenizer.TT_NUMBER)
valueN = toks.nval;
else
throw new XPathException(xpath, "right hand side of greater-than", toks,
"quoted string or number");
toks.nextToken();
return new AttrGreaterExpr(name, valueN);
case '!':
toks.nextToken();
if (toks.ttype != '=') throw new XPathException(xpath, "after !", toks, "=");
toks.nextToken();
if (toks.ttype != '\"' && toks.ttype != '\'')
throw new XPathException(xpath, "right hand side of !=", toks, "quoted string");
value = toks.sval;
toks.nextToken();
return new AttrNotEqualsExpr(name, value);
default:
return new AttrExistsExpr(name);
}
case SimpleStreamTokenizer.TT_WORD:
if (!toks.sval.equals("text"))
throw new XPathException(xpath, "at beginning of expression", toks, "text()");
if (toks.nextToken() != '(') throw new XPathException(xpath, "after text", toks, "(");
if (toks.nextToken() != ')') throw new XPathException(xpath, "after text(", toks, ")");
String tValue;
switch (toks.nextToken()) {
case '=':
toks.nextToken();
if (toks.ttype != '\"' && toks.ttype != '\'')
throw new XPathException(xpath, "right hand side of equals", toks, "quoted string");
tValue = toks.sval;
toks.nextToken();
return new TextEqualsExpr(tValue);
case '!':
toks.nextToken();
if (toks.ttype != '=') throw new XPathException(xpath, "after !", toks, "=");
toks.nextToken();
if (toks.ttype != '\"' && toks.ttype != '\'')
throw new XPathException(xpath, "right hand side of !=", toks, "quoted string");
tValue = toks.sval;
toks.nextToken();
return new TextNotEqualsExpr(tValue);
default:
return TextExistsExpr.INSTANCE;
}
}
}
}
// $Log: ExprFactory.java,v $
// Revision 1.8 2003/07/18 00:01:42 eobrain
// Make compatiblie with J2ME. For example do not use "new"
// java.util classes.
//
// Revision 1.7 2003/05/12 20:07:59 eobrain
// Inconsequential code change to avoid eclipse warning.
//
// Revision 1.6 2003/01/09 01:12:37 yuhongx
// Use JDK1.1 API to make the code work with PersonalJava.
//
// Revision 1.5 2002/12/06 23:37:37 eobrain
// Make objects that are always the same follow the Flyweight Pattern.
//
// Revision 1.4 2002/12/05 04:34:38 eobrain
// Add support for greater than and less than relational expressions in predicates.
//
// Revision 1.3 2002/10/30 16:30:16 eobrain
// Feature request [ 630127 ] Support /a/b[text()='foo']
// http://sourceforge.net/projects/sparta-xml/
//
// Revision 1.2 2002/09/18 05:30:21 eobrain
// Support xpath predicates of the form [1], [2], ...
//
// Revision 1.1.1.1 2002/08/19 05:04:04 eobrain
// import from HP Labs internal CVS
//
// Revision 1.3 2002/08/18 23:38:41 eob
// Add copyright and other formatting and commenting in preparation for
// release to SourceForge.
//
// Revision 1.2 2002/05/23 21:12:10 eob
// Better error reporting.
//
// Revision 1.1 2002/02/01 02:01:08 eob
// initial
