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lightning-sunbird  0.9+nobinonly
FilterExpr.cpp
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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  * The MITRE Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Keith Visco <kvisco@ziplink.net> (Original Author)
00024  *   Bob Miller <kbob@oblix.com>
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 #include "Expr.h"
00041 #include "txNodeSet.h"
00042 #include "txIXPathContext.h"
00043 
00044 //-- Implementation of FilterExpr --/
00045 
00046   //-----------------------------/
00047  //- Virtual methods from Expr -/
00048 //-----------------------------/
00049 
00058 nsresult
00059 FilterExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
00060 {
00061     *aResult = nsnull;
00062 
00063     nsRefPtr<txAExprResult> exprRes;
00064     nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
00065     NS_ENSURE_SUCCESS(rv, rv);
00066 
00067     NS_ENSURE_TRUE(exprRes->getResultType() == txAExprResult::NODESET,
00068                    NS_ERROR_XSLT_NODESET_EXPECTED);
00069 
00070     nsRefPtr<txNodeSet> nodes =
00071         NS_STATIC_CAST(txNodeSet*, NS_STATIC_CAST(txAExprResult*, exprRes));
00072     // null out exprRes so that we can test for shared-ness
00073     exprRes = nsnull;
00074 
00075     nsRefPtr<txNodeSet> nonShared;
00076     rv = aContext->recycler()->getNonSharedNodeSet(nodes,
00077                                                    getter_AddRefs(nonShared));
00078     NS_ENSURE_SUCCESS(rv, rv);
00079 
00080     rv = evaluatePredicates(nonShared, aContext);
00081     NS_ENSURE_SUCCESS(rv, rv);
00082 
00083     *aResult = nonShared;
00084     NS_ADDREF(*aResult);
00085 
00086     return NS_OK;
00087 } //-- evaluate
00088 
00089 #ifdef TX_TO_STRING
00090 void
00091 FilterExpr::toString(nsAString& str)
00092 {
00093     if ( expr ) expr->toString(str);
00094     else str.AppendLiteral("null");
00095     PredicateList::toString(str);
00096 }
00097 #endif
00098