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#include "config.h"
32
33#include "MutationRecord.h"
34
35#include "Node.h"
36#include "NodeList.h"
37#include "QualifiedName.h"
38#include "StaticNodeList.h"
39#include <wtf/Assertions.h>
40#include <wtf/StdLibExtras.h>
41
42namespace WebCore {
43
44namespace {
45
46class ChildListRecord : public MutationRecord {
47public:
48    ChildListRecord(PassRefPtr<Node> target, PassRefPtr<NodeList> added, PassRefPtr<NodeList> removed, PassRefPtr<Node> previousSibling, PassRefPtr<Node> nextSibling)
49        : m_target(target)
50        , m_addedNodes(added)
51        , m_removedNodes(removed)
52        , m_previousSibling(previousSibling)
53        , m_nextSibling(nextSibling)
54    {
55    }
56
57private:
58    virtual const AtomicString& type() OVERRIDE;
59    virtual Node* target() OVERRIDE { return m_target.get(); }
60    virtual NodeList* addedNodes() OVERRIDE { return m_addedNodes.get(); }
61    virtual NodeList* removedNodes() OVERRIDE { return m_removedNodes.get(); }
62    virtual Node* previousSibling() OVERRIDE { return m_previousSibling.get(); }
63    virtual Node* nextSibling() OVERRIDE { return m_nextSibling.get(); }
64
65    RefPtr<Node> m_target;
66    RefPtr<NodeList> m_addedNodes;
67    RefPtr<NodeList> m_removedNodes;
68    RefPtr<Node> m_previousSibling;
69    RefPtr<Node> m_nextSibling;
70};
71
72class RecordWithEmptyNodeLists : public MutationRecord {
73public:
74    RecordWithEmptyNodeLists(PassRefPtr<Node> target, const String& oldValue)
75        : m_target(target)
76        , m_oldValue(oldValue)
77    {
78    }
79
80private:
81    virtual Node* target() OVERRIDE { return m_target.get(); }
82    virtual String oldValue() OVERRIDE { return m_oldValue; }
83    virtual NodeList* addedNodes() OVERRIDE { return lazilyInitializeEmptyNodeList(m_addedNodes); }
84    virtual NodeList* removedNodes() OVERRIDE { return lazilyInitializeEmptyNodeList(m_removedNodes); }
85
86    static NodeList* lazilyInitializeEmptyNodeList(RefPtr<NodeList>& nodeList)
87    {
88        if (!nodeList)
89            nodeList = StaticNodeList::createEmpty();
90        return nodeList.get();
91    }
92
93    RefPtr<Node> m_target;
94    String m_oldValue;
95    RefPtr<NodeList> m_addedNodes;
96    RefPtr<NodeList> m_removedNodes;
97};
98
99class AttributesRecord : public RecordWithEmptyNodeLists {
100public:
101    AttributesRecord(PassRefPtr<Node> target, const QualifiedName& name, const AtomicString& oldValue)
102        : RecordWithEmptyNodeLists(target, oldValue)
103        , m_attributeName(name.localName())
104        , m_attributeNamespace(name.namespaceURI())
105    {
106    }
107
108private:
109    virtual const AtomicString& type() OVERRIDE;
110    virtual const AtomicString& attributeName() OVERRIDE { return m_attributeName; }
111    virtual const AtomicString& attributeNamespace() OVERRIDE { return m_attributeNamespace; }
112
113    AtomicString m_attributeName;
114    AtomicString m_attributeNamespace;
115};
116
117class CharacterDataRecord : public RecordWithEmptyNodeLists {
118public:
119    CharacterDataRecord(PassRefPtr<Node> target, const String& oldValue)
120        : RecordWithEmptyNodeLists(target, oldValue)
121    {
122    }
123
124private:
125    virtual const AtomicString& type() OVERRIDE;
126};
127
128class MutationRecordWithNullOldValue : public MutationRecord {
129public:
130    MutationRecordWithNullOldValue(PassRefPtr<MutationRecord> record)
131        : m_record(record)
132    {
133    }
134
135private:
136    virtual const AtomicString& type() OVERRIDE { return m_record->type(); }
137    virtual Node* target() OVERRIDE { return m_record->target(); }
138    virtual NodeList* addedNodes() OVERRIDE { return m_record->addedNodes(); }
139    virtual NodeList* removedNodes() OVERRIDE { return m_record->removedNodes(); }
140    virtual Node* previousSibling() OVERRIDE { return m_record->previousSibling(); }
141    virtual Node* nextSibling() OVERRIDE { return m_record->nextSibling(); }
142    virtual const AtomicString& attributeName() OVERRIDE { return m_record->attributeName(); }
143    virtual const AtomicString& attributeNamespace() OVERRIDE { return m_record->attributeNamespace(); }
144
145    virtual String oldValue() OVERRIDE { return String(); }
146
147    RefPtr<MutationRecord> m_record;
148};
149
150const AtomicString& ChildListRecord::type()
151{
152    DEFINE_STATIC_LOCAL(AtomicString, childList, ("childList", AtomicString::ConstructFromLiteral));
153    return childList;
154}
155
156const AtomicString& AttributesRecord::type()
157{
158    DEFINE_STATIC_LOCAL(AtomicString, attributes, ("attributes", AtomicString::ConstructFromLiteral));
159    return attributes;
160}
161
162const AtomicString& CharacterDataRecord::type()
163{
164    DEFINE_STATIC_LOCAL(AtomicString, characterData, ("characterData", AtomicString::ConstructFromLiteral));
165    return characterData;
166}
167
168} // namespace
169
170PassRefPtr<MutationRecord> MutationRecord::createChildList(PassRefPtr<Node> target, PassRefPtr<NodeList> added, PassRefPtr<NodeList> removed, PassRefPtr<Node> previousSibling, PassRefPtr<Node> nextSibling)
171{
172    return adoptRef(static_cast<MutationRecord*>(new ChildListRecord(target, added, removed, previousSibling, nextSibling)));
173}
174
175PassRefPtr<MutationRecord> MutationRecord::createAttributes(PassRefPtr<Node> target, const QualifiedName& name, const AtomicString& oldValue)
176{
177    return adoptRef(static_cast<MutationRecord*>(new AttributesRecord(target, name, oldValue)));
178}
179
180PassRefPtr<MutationRecord> MutationRecord::createCharacterData(PassRefPtr<Node> target, const String& oldValue)
181{
182    return adoptRef(static_cast<MutationRecord*>(new CharacterDataRecord(target, oldValue)));
183}
184
185PassRefPtr<MutationRecord> MutationRecord::createWithNullOldValue(PassRefPtr<MutationRecord> record)
186{
187    return adoptRef(static_cast<MutationRecord*>(new MutationRecordWithNullOldValue(record)));
188}
189
190MutationRecord::~MutationRecord()
191{
192}
193
194} // namespace WebCore
195