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 : * Neil Deakin <enndeakin@sympatico.ca>
25 : *
26 : * Alternatively, the contents of this file may be used under the terms of
27 : * either of the GNU General Public License Version 2 or later (the "GPL"),
28 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 : * in which case the provisions of the GPL or the LGPL are applicable instead
30 : * of those above. If you wish to allow use of your version of this file only
31 : * under the terms of either the GPL or the LGPL, and not to allow others to
32 : * use your version of this file under the terms of the MPL, indicate your
33 : * decision by deleting the provisions above and replace them with the notice
34 : * and other provisions required by the GPL or the LGPL. If you do not delete
35 : * the provisions above, a recipient may use your version of this file under
36 : * the terms of any one of the MPL, the GPL or the LGPL.
37 : *
38 : * ***** END LICENSE BLOCK ***** */
39 :
40 : #include "nsInstantiationNode.h"
41 : #include "nsTemplateRule.h"
42 : #include "nsXULTemplateQueryProcessorRDF.h"
43 :
44 : #include "prlog.h"
45 : #ifdef PR_LOGGING
46 : extern PRLogModuleInfo* gXULTemplateLog;
47 : #endif
48 :
49 0 : nsInstantiationNode::nsInstantiationNode(nsXULTemplateQueryProcessorRDF* aProcessor,
50 : nsRDFQuery* aQuery)
51 : : mProcessor(aProcessor),
52 0 : mQuery(aQuery)
53 : {
54 : #ifdef PR_LOGGING
55 0 : PR_LOG(gXULTemplateLog, PR_LOG_DEBUG,
56 : ("nsInstantiationNode[%p] query=%p", this, aQuery));
57 : #endif
58 :
59 0 : MOZ_COUNT_CTOR(nsInstantiationNode);
60 0 : }
61 :
62 :
63 0 : nsInstantiationNode::~nsInstantiationNode()
64 : {
65 0 : MOZ_COUNT_DTOR(nsInstantiationNode);
66 0 : }
67 :
68 : nsresult
69 0 : nsInstantiationNode::Propagate(InstantiationSet& aInstantiations,
70 : bool aIsUpdate, bool& aTakenInstantiations)
71 : {
72 : // In update mode, iterate through the results and call the template
73 : // builder to update them. In non-update mode, cache them in the processor
74 : // to be used during processing. The results are cached in the processor
75 : // so that the simple rules are only computed once. In this situation, all
76 : // data for all queries are calculated at once.
77 0 : nsresult rv = NS_OK;
78 :
79 0 : aTakenInstantiations = false;
80 :
81 0 : if (aIsUpdate) {
82 : // Iterate through newly added keys to determine which rules fired.
83 : //
84 : // XXXwaterson Unfortunately, this could also lead to retractions;
85 : // e.g., (container ?a ^empty false) could become "unmatched". How
86 : // to track those?
87 0 : nsCOMPtr<nsIDOMNode> querynode;
88 0 : mQuery->GetQueryNode(getter_AddRefs(querynode));
89 :
90 0 : InstantiationSet::ConstIterator last = aInstantiations.Last();
91 0 : for (InstantiationSet::ConstIterator inst = aInstantiations.First(); inst != last; ++inst) {
92 0 : nsAssignmentSet assignments = inst->mAssignments;
93 :
94 0 : nsCOMPtr<nsIRDFNode> node;
95 : assignments.GetAssignmentFor(mQuery->mMemberVariable,
96 0 : getter_AddRefs(node));
97 0 : if (node) {
98 0 : nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(node);
99 0 : if (resource) {
100 : nsRefPtr<nsXULTemplateResultRDF> nextresult =
101 0 : new nsXULTemplateResultRDF(mQuery, *inst, resource);
102 0 : if (! nextresult)
103 0 : return NS_ERROR_OUT_OF_MEMORY;
104 :
105 0 : rv = mProcessor->AddMemoryElements(*inst, nextresult);
106 0 : if (NS_FAILED(rv))
107 0 : return rv;
108 :
109 0 : mProcessor->GetBuilder()->AddResult(nextresult, querynode);
110 : }
111 : }
112 : }
113 : }
114 : else {
115 0 : nsresult rv = mQuery->SetCachedResults(mProcessor, aInstantiations);
116 0 : if (NS_SUCCEEDED(rv))
117 0 : aTakenInstantiations = true;
118 : }
119 :
120 0 : return rv;
121 : }
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