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 "nsXULTemplateResultSetRDF.h"
38 : #include "nsXULTemplateQueryProcessorRDF.h"
39 :
40 0 : NS_IMPL_ISUPPORTS1(nsXULTemplateResultSetRDF, nsISimpleEnumerator)
41 :
42 : NS_IMETHODIMP
43 0 : nsXULTemplateResultSetRDF::HasMoreElements(bool *aResult)
44 : {
45 0 : *aResult = true;
46 :
47 0 : nsCOMPtr<nsIRDFNode> node;
48 :
49 0 : if (! mInstantiations || ! mQuery) {
50 0 : *aResult = false;
51 0 : return NS_OK;
52 : }
53 :
54 0 : if (mCheckedNext) {
55 0 : if (!mCurrent || mCurrent == &(mInstantiations->mHead))
56 0 : *aResult = false;
57 0 : return NS_OK;
58 : }
59 :
60 0 : mCheckedNext = true;
61 :
62 0 : do {
63 0 : if (mCurrent) {
64 0 : mCurrent = mCurrent->mNext;
65 0 : if (mCurrent == &(mInstantiations->mHead)) {
66 0 : *aResult = false;
67 0 : return NS_OK;
68 : }
69 : }
70 : else {
71 0 : *aResult = ! mInstantiations->Empty();
72 0 : if (*aResult)
73 0 : mCurrent = mInstantiations->mHead.mNext;
74 : }
75 :
76 : // get the value of the member variable. If it is not set, skip
77 : // the result and move on to the next result
78 0 : if (mCurrent) {
79 : mCurrent->mInstantiation.mAssignments.
80 0 : GetAssignmentFor(mQuery->mMemberVariable, getter_AddRefs(node));
81 : }
82 :
83 : // only resources may be used as results
84 0 : mResource = do_QueryInterface(node);
85 0 : } while (! mResource);
86 :
87 0 : return NS_OK;
88 : }
89 :
90 : NS_IMETHODIMP
91 0 : nsXULTemplateResultSetRDF::GetNext(nsISupports **aResult)
92 : {
93 0 : if (!aResult)
94 0 : return NS_ERROR_NULL_POINTER;
95 :
96 0 : if (!mCurrent || !mCheckedNext)
97 0 : return NS_ERROR_FAILURE;
98 :
99 : nsRefPtr<nsXULTemplateResultRDF> nextresult =
100 0 : new nsXULTemplateResultRDF(mQuery, mCurrent->mInstantiation, mResource);
101 0 : if (!nextresult)
102 0 : return NS_ERROR_OUT_OF_MEMORY;
103 :
104 : // add the supporting memory elements to the processor's map. These are
105 : // used to remove the results when an assertion is removed from the graph
106 0 : mProcessor->AddMemoryElements(mCurrent->mInstantiation, nextresult);
107 :
108 0 : mCheckedNext = false;
109 :
110 0 : *aResult = nextresult;
111 0 : NS_ADDREF(*aResult);
112 :
113 0 : return NS_OK;
114 : }
|