content/xul/templates/src/nsContentTestNode.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 Communicator client code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Chris Waterson <waterson@netscape.com>
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
  27  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsContentTestNode.h"
  40 #include "nsIRDFResource.h"
  41 #include "nsIAtom.h"
  42 #include "nsIDOMElement.h"
  43 #include "nsXULContentUtils.h"
  44 #include "nsPrintfCString.h"
  45 #include "nsIXULTemplateResult.h"
  46 #include "nsIXULTemplateBuilder.h"
  47 #include "nsXULTemplateQueryProcessorRDF.h"
  48
  49 #include "prlog.h"
  50 #ifdef PR_LOGGING
  51 extern PRLogModuleInfo* gXULTemplateLog;
  52 #endif
  53
  54 nsContentTestNode::nsContentTestNode(nsXULTemplateQueryProcessorRDF* aProcessor,
  55                                      nsIAtom* aRefVariable)
  56     : TestNode(nsnull),
  57       mProcessor(aProcessor),
  58       mDocument(nsnull),
  59       mRefVariable(aRefVariable),
  60       mTag(nsnull)
  61 {
  62 #ifdef PR_LOGGING
  63     if (PR_LOG_TEST(gXULTemplateLog, PR_LOG_DEBUG)) {
  64         nsAutoString tag(NS_LITERAL_STRING("(none)"));
  65         if (mTag)
  66             mTag->ToString(tag);
  67
  68         nsAutoString refvar(NS_LITERAL_STRING("(none)"));
  69         if (aRefVariable)
  70             aRefVariable->ToString(refvar);
  71
  72         PR_LOG(gXULTemplateLog, PR_LOG_DEBUG,
  73                ("nsContentTestNode[%p]: ref-var=%s tag=%s",
  74                 this, NS_ConvertUTF16toUTF8(refvar).get(),
  75                 NS_ConvertUTF16toUTF8(tag).get()));
  76     }
  77 #endif
  78 }
  79
  80 nsresult
  81 nsContentTestNode::FilterInstantiations(InstantiationSet& aInstantiations,
  82                                         PRBool* aCantHandleYet) const
  83
  84 {
  85     if (aCantHandleYet)
  86         *aCantHandleYet = PR_FALSE;
  87     return NS_OK;
  88 }
  89
  90 nsresult
  91 nsContentTestNode::Constrain(InstantiationSet& aInstantiations)
  92 {
  93     // contrain the matches to those that have matched in the template builder
  94
  95     nsIXULTemplateBuilder* builder = mProcessor->GetBuilder();
  96     if (!builder) {
  97         aInstantiations.Clear();
  98         return NS_OK;
  99     }
 100
 101     nsresult rv;
 102
 103     InstantiationSet::Iterator last = aInstantiations.Last();
 104     for (InstantiationSet::Iterator inst = aInstantiations.First(); inst != last; ++inst) {
 105
 106         nsCOMPtr<nsIRDFNode> refValue;
 107         PRBool hasRefBinding = inst->mAssignments.GetAssignmentFor(mRefVariable,
 108                                                                    getter_AddRefs(refValue));
 109         if (hasRefBinding) {
 110             nsCOMPtr<nsIRDFResource> refResource = do_QueryInterface(refValue);
 111             if (refResource) {
 112                 PRBool generated;
 113                 rv = builder->HasGeneratedContent(refResource, mTag, &generated);
 114                 if (NS_FAILED(rv)) return rv;
 115
 116                 if (generated)
 117                     continue;
 118             }
 119         }
 120
 121         aInstantiations.Erase(inst--);
 122     }
 123
 124     return NS_OK;
 125 }