/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.xsl.java;
import com.caucho.java.JavaWriter;
import com.caucho.xml.QName;
import com.caucho.xpath.Expr;
import com.caucho.xsl.Sort;
import com.caucho.xsl.XslParseException;
/**
* Represents the xsl:sort element.
*/
public class XslSort extends XslNode {
private String _select;
private String _lang;
private String _order;
private String _caseOrder;
private String _dataType;
/**
* Returns the tag name.
*/
public String getTagName()
{
return "xsl:sort";
}
/**
* Adds an attribute.
*/
public void addAttribute(QName name, String value)
throws XslParseException
{
if (name.getName().equals("select")) {
_select = value;
}
else if (name.getName().equals("case-order")) {
if (value.equals("upper-first") ||
value.equals("lower-first"))
_caseOrder = value;
else
throw error(L.l("'{0}' is not a valid case-order for xsl:sort.",
value));
}
else if (name.getName().equals("order")) {
_order = value;
}
else if (name.getName().equals("data-type")) {
_dataType = value;
}
else if (name.getName().equals("xsl:lang") ||
name.getName().equals("lang")) {
_lang = value;
}
else
super.addAttribute(name, value);
}
/**
* Ends the attributes.
*/
public void endAttributes()
throws XslParseException
{
if (_select == null)
throw error(L.l("<xsl:sort> requires a 'select' attribute."));
}
/**
* Generates the sort value.
*/
public Sort generateSort()
throws Exception
{
Expr expr = parseExpr(_select);
Expr isAscending = constructBoolean(_order, "ascending");
Expr caseOrder = constructBoolean(_caseOrder, "upper-first");
if (_caseOrder == null)
caseOrder = null;
boolean isText = ! "number".equals(_dataType);
Sort sort;
if (_lang == null) {
sort = Sort.create(expr, isAscending, isText);
}
else {
String lang = _lang;
if (lang.startsWith("{") && lang.endsWith("}"))
lang = lang.substring(1, lang.length() - 1);
else
lang = "'" + lang + "'";
sort = Sort.create(expr, isAscending, parseExpr(lang));
}
sort.setCaseOrder(caseOrder);
return sort;
}
/**
* Tests for a boolean EL value.
*/
private Expr constructBoolean(String test, String match)
throws XslParseException
{
if (test == null) {
return parseExpr("true()");
}
else if (test.startsWith("{") && test.endsWith("}")) {
test = test.substring(1, test.length() - 1);
return parseExpr(test + " = '" + match + "'");
}
else if (test.equals(match))
return parseExpr("true()");
else
return parseExpr("false()");
}
/**
* Generates the code for the tag
*
* @param out the output writer for the generated java.
*/
public void generate(JavaWriter out)
throws Exception
{
throw error(L.l("<xsl:sort> must be a child of <xsl:for-each> or <xsl:apply-templates>"));
}
}