content/xul/templates/src/nsRDFQuery.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is Neil Deakin
  18  * Portions created by the Initial Developer are Copyright (C) 2005
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *
  23  * Alternatively, the contents of this file may be used under the terms of
  24  * either of the GNU General Public License Version 2 or later (the "GPL"),
  25  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  26  * in which case the provisions of the GPL or the LGPL are applicable instead
  27  * of those above. If you wish to allow use of your version of this file only
  28  * under the terms of either the GPL or the LGPL, and not to allow others to
  29  * use your version of this file under the terms of the MPL, indicate your
  30  * decision by deleting the provisions above and replace them with the notice
  31  * and other provisions required by the GPL or the LGPL. If you do not delete
  32  * the provisions above, a recipient may use your version of this file under
  33  * the terms of any one of the MPL, the GPL or the LGPL.
  34  *
  35  * ***** END LICENSE BLOCK ***** */
  36
  37 #include "nscore.h"
  38 #include "nsCOMPtr.h"
  39
  40 #include "nsXULTemplateQueryProcessorRDF.h"
  41 #include "nsRDFQuery.h"
  42
  43 NS_IMPL_CYCLE_COLLECTION_1(nsRDFQuery, mQueryNode)
  44
  45 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsRDFQuery)
  46   NS_INTERFACE_MAP_ENTRY(nsITemplateRDFQuery)
  47   NS_INTERFACE_MAP_ENTRY(nsISupports)
  48 NS_INTERFACE_MAP_END
  49
  50 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsRDFQuery)
  51 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsRDFQuery)
  52
  53 void
  54 nsRDFQuery::Finish()
  55 {
  56     // the template builder is going away and the query processor likely as
  57     // well. Clear the reference to avoid calling it.
  58     mProcessor = nsnull;
  59     mCachedResults = nsnull;
  60 }
  61
  62 nsresult
  63 nsRDFQuery::SetCachedResults(nsXULTemplateQueryProcessorRDF* aProcessor,
  64                              const InstantiationSet& aInstantiations)
  65 {
  66     mCachedResults = new nsXULTemplateResultSetRDF(aProcessor, this, &aInstantiations);
  67     if (! mCachedResults)
  68         return NS_ERROR_OUT_OF_MEMORY;
  69
  70     return NS_OK;
  71 }
  72
  73
  74 void
  75 nsRDFQuery::UseCachedResults(nsISimpleEnumerator** aResults)
  76 {
  77     *aResults = mCachedResults;
  78     NS_IF_ADDREF(*aResults);
  79
  80     mCachedResults = nsnull;
  81 }