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lightning-sunbird  0.9+nobinonly
UnionExpr.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  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either the GNU General Public License Version 2 or later (the "GPL"), or
00027  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
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00031  * use your version of this file under the terms of the MPL, indicate your
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00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "Expr.h"
00040 #include "txIXPathContext.h"
00041 #include "txNodeSet.h"
00042 
00043   //-------------/
00044  //- UnionExpr -/
00045 //-------------/
00046 
00047 
00051 UnionExpr::UnionExpr() {
00052     //-- do nothing
00053 }
00054 
00058 UnionExpr::~UnionExpr() {
00059     txListIterator iter(&expressions);
00060     while (iter.hasNext()) {
00061          delete (Expr*)iter.next();
00062     }
00063 } //-- ~UnionExpr
00064 
00069 nsresult
00070 UnionExpr::addExpr(Expr* aExpr)
00071 {
00072     nsresult rv = expressions.add(aExpr);
00073     if (NS_FAILED(rv)) {
00074         delete aExpr;
00075     }
00076     return rv;
00077 } //-- addExpr
00078 
00079     //-----------------------------/
00080   //- Virtual methods from Expr -/
00081 //-----------------------------/
00082 
00090 nsresult
00091 UnionExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
00092 {
00093     *aResult = nsnull;
00094     nsRefPtr<txNodeSet> nodes;
00095     nsresult rv = aContext->recycler()->getNodeSet(getter_AddRefs(nodes));
00096     NS_ENSURE_SUCCESS(rv, rv);
00097 
00098     txListIterator iter(&expressions);
00099     while (iter.hasNext()) {
00100         Expr* expr = (Expr*)iter.next();
00101         nsRefPtr<txAExprResult> exprResult;
00102         rv = expr->evaluate(aContext, getter_AddRefs(exprResult));
00103         NS_ENSURE_SUCCESS(rv, rv);
00104 
00105         if (exprResult->getResultType() != txAExprResult::NODESET) {
00106             //XXX ErrorReport: report nonnodeset error
00107             return NS_ERROR_XSLT_NODESET_EXPECTED;
00108         }
00109 
00110         nsRefPtr<txNodeSet> resultSet, ownedSet;
00111         resultSet = NS_STATIC_CAST(txNodeSet*,
00112                                    NS_STATIC_CAST(txAExprResult*, exprResult));
00113         exprResult = nsnull;
00114         rv = aContext->recycler()->
00115             getNonSharedNodeSet(resultSet, getter_AddRefs(ownedSet));
00116         NS_ENSURE_SUCCESS(rv, rv);
00117 
00118         rv = nodes->addAndTransfer(ownedSet);
00119         NS_ENSURE_SUCCESS(rv, rv);
00120     }
00121 
00122     *aResult = nodes;
00123     NS_ADDREF(*aResult);
00124 
00125     return NS_OK;
00126 } //-- evaluate
00127 
00128 #ifdef TX_TO_STRING
00129 void
00130 UnionExpr::toString(nsAString& dest)
00131 {
00132     txListIterator iter(&expressions);
00133 
00134     short count = 0;
00135     while (iter.hasNext()) {
00136         //-- set operator
00137         if (count > 0)
00138             dest.AppendLiteral(" | ");
00139         ((Expr*)iter.next())->toString(dest);
00140         ++count;
00141     }
00142 }
00143 #endif