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txNodeSorter.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is TransforMiiX XSLT processor code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Jonas Sicking.
00019  * Portions created by the Initial Developer are Copyright (C) 2001
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Jonas Sicking <sicking@bigfoot.com>
00024  *   Peter Van der Beken <peterv@propagandism.org>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either the GNU General Public License Version 2 or later (the "GPL"), or
00028  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
00030  * of those above. If you wish to allow use of your version of this file only
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00032  * use your version of this file under the terms of the MPL, indicate your
00033  * decision by deleting the provisions above and replace them with the notice
00034  * and other provisions required by the GPL or the LGPL. If you do not delete
00035  * the provisions above, a recipient may use your version of this file under
00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #ifndef TRANSFRMX_NODESORTER_H
00041 #define TRANSFRMX_NODESORTER_H
00042 
00043 #include "txCore.h"
00044 #include "txList.h"
00045 
00046 class Expr;
00047 class txExecutionState;
00048 class txNodeSet;
00049 class TxObject;
00050 class txXPathResultComparator;
00051 class txIEvalContext;
00052 class txNodeSetContext;
00053 
00054 /*
00055  * Sorts Nodes as specified by the W3C XSLT 1.0 Recommendation
00056  */
00057 
00058 class txNodeSorter
00059 {
00060 public:
00061     txNodeSorter();
00062     ~txNodeSorter();
00063 
00064     nsresult addSortElement(Expr* aSelectExpr, Expr* aLangExpr,
00065                             Expr* aDataTypeExpr, Expr* aOrderExpr,
00066                             Expr* aCaseOrderExpr, txIEvalContext* aContext);
00067     nsresult sortNodeSet(txNodeSet* aNodes, txExecutionState* aEs,
00068                          txNodeSet** aResult);
00069 
00070 private:
00071     struct SortData
00072     {
00073         txNodeSorter* mNodeSorter;
00074         txNodeSetContext* mContext;
00075         TxObject** mSortValues;
00076         nsresult mRv;
00077     };
00078     struct SortKey
00079     {
00080         Expr* mExpr;
00081         txXPathResultComparator* mComparator;
00082     };
00083 
00084     static int compareNodes(const void* aIndexA, const void* aIndexB,
00085                             void* aSortData);
00086     static PRBool calcSortValue(TxObject*& aSortValue, SortKey* aKey,
00087                                 SortData* aSortData, PRUint32 aNodeIndex);
00088     txList mSortKeys;
00089     int mNKeys;
00090 };
00091 
00092 #endif