1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef MutationObserverInterestGroup_h
32#define MutationObserverInterestGroup_h
33
34#if ENABLE(MUTATION_OBSERVERS)
35
36#include "Document.h"
37#include "Node.h"
38#include "QualifiedName.h"
39#include "WebKitMutationObserver.h"
40#include <wtf/HashMap.h>
41#include <wtf/PassOwnPtr.h>
42#include <wtf/text/AtomicString.h>
43
44namespace WebCore {
45
46class MutationObserverInterestGroup {
47public:
48 static PassOwnPtr<MutationObserverInterestGroup> createForChildListMutation(Node* target)
49 {
50 if (!target->document()->hasMutationObserversOfType(WebKitMutationObserver::ChildList))
51 return nullptr;
52
53 MutationRecordDeliveryOptions oldValueFlag = 0;
54 return createIfNeeded(target, WebKitMutationObserver::ChildList, nullAtom, oldValueFlag);
55 }
56
57 static PassOwnPtr<MutationObserverInterestGroup> createForCharacterDataMutation(Node* target)
58 {
59 if (!target->document()->hasMutationObserversOfType(WebKitMutationObserver::CharacterData))
60 return nullptr;
61
62 return createIfNeeded(target, WebKitMutationObserver::CharacterData, nullAtom, WebKitMutationObserver::CharacterDataOldValue);
63 }
64
65 static PassOwnPtr<MutationObserverInterestGroup> createForAttributesMutation(Node* target, const QualifiedName& attributeName)
66 {
67 if (!target->document()->hasMutationObserversOfType(WebKitMutationObserver::Attributes))
68 return nullptr;
69
70 return createIfNeeded(target, WebKitMutationObserver::Attributes, attributeName.localName(), WebKitMutationObserver::AttributeOldValue);
71 }
72
73 bool isOldValueRequested();
74 void enqueueMutationRecord(PassRefPtr<MutationRecord>);
75
76private:
77 static PassOwnPtr<MutationObserverInterestGroup> createIfNeeded(Node* target, WebKitMutationObserver::MutationType, const AtomicString& attributeName, MutationRecordDeliveryOptions oldValueFlag);
78 MutationObserverInterestGroup(HashMap<WebKitMutationObserver*, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag);
79
80 bool hasOldValue(MutationRecordDeliveryOptions options) { return options & m_oldValueFlag; }
81
82 HashMap<WebKitMutationObserver*, MutationRecordDeliveryOptions> m_observers;
83 MutationRecordDeliveryOptions m_oldValueFlag;
84};
85
86}
87
88#endif // ENABLE(MUTATION_OBSERVERS)
89
90#endif // MutationObserverInterestGroup_h