1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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
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 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either of the GNU General Public License Version 2 or later (the "GPL"),
26 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
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31 : * decision by deleting the provisions above and replace them with the notice
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33 : * the provisions above, a recipient may use your version of this file under
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35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #include "nsITransaction.h"
39 : #include "nsTransactionItem.h"
40 : #include "nsTransactionStack.h"
41 : #include "nsCOMPtr.h"
42 : #include "nsAutoPtr.h"
43 : #include "nsCycleCollectionParticipant.h"
44 : #include "mozilla/Util.h"
45 :
46 3039 : nsTransactionStack::nsTransactionStack(nsTransactionStack::Type aType)
47 : : mQue(0)
48 3039 : , mType(aType)
49 : {
50 3039 : }
51 :
52 6078 : nsTransactionStack::~nsTransactionStack()
53 : {
54 3039 : Clear();
55 3039 : }
56 :
57 : void
58 18563 : nsTransactionStack::Push(nsTransactionItem *aTransaction)
59 : {
60 18563 : if (!aTransaction) {
61 0 : return;
62 : }
63 :
64 : /* nsDeque's Push() method adds new items at the back
65 : * of the deque.
66 : */
67 18563 : NS_ADDREF(aTransaction);
68 18563 : mQue.Push(aTransaction);
69 : }
70 :
71 : already_AddRefed<nsTransactionItem>
72 16988 : nsTransactionStack::Pop()
73 : {
74 : /* nsDeque is a FIFO, so the top of our stack is actually
75 : * the back of the deque.
76 : */
77 16988 : return static_cast<nsTransactionItem*> (mQue.Pop());
78 : }
79 :
80 : already_AddRefed<nsTransactionItem>
81 5064 : nsTransactionStack::PopBottom()
82 : {
83 : /* nsDeque is a FIFO, so the bottom of our stack is actually
84 : * the front of the deque.
85 : */
86 5064 : return static_cast<nsTransactionItem*> (mQue.PopFront());
87 : }
88 :
89 : already_AddRefed<nsTransactionItem>
90 15500 : nsTransactionStack::Peek()
91 : {
92 15500 : nsTransactionItem* transaction = nsnull;
93 15500 : if (mQue.GetSize()) {
94 14364 : NS_IF_ADDREF(transaction = static_cast<nsTransactionItem*>(mQue.Last()));
95 : }
96 :
97 15500 : return transaction;
98 : }
99 :
100 : already_AddRefed<nsTransactionItem>
101 0 : nsTransactionStack::GetItem(PRInt32 aIndex)
102 : {
103 0 : nsTransactionItem* transaction = nsnull;
104 0 : if (aIndex >= 0 && aIndex < mQue.GetSize()) {
105 0 : NS_IF_ADDREF(transaction =
106 0 : static_cast<nsTransactionItem*>(mQue.ObjectAt(aIndex)));
107 : }
108 :
109 0 : return transaction;
110 : }
111 :
112 : void
113 3489 : nsTransactionStack::Clear()
114 : {
115 6978 : nsRefPtr<nsTransactionItem> tx;
116 :
117 7842 : do {
118 7842 : tx = mType == FOR_UNDO ? Pop() : PopBottom();
119 7842 : } while (tx);
120 3489 : }
121 :
122 : void
123 6 : nsTransactionStack::DoTraverse(nsCycleCollectionTraversalCallback &cb)
124 : {
125 6 : for (PRInt32 i = 0, qcount = mQue.GetSize(); i < qcount; ++i) {
126 : nsTransactionItem *item =
127 0 : static_cast<nsTransactionItem*>(mQue.ObjectAt(i));
128 0 : if (item) {
129 0 : NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "transaction stack mQue[i]");
130 0 : cb.NoteNativeChild(item, &NS_CYCLE_COLLECTION_NAME(nsTransactionItem));
131 : }
132 : }
133 6 : }
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