1/*
2    Copyright (C) Research In Motion Limited 2010. All rights reserved.
3
4    This library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Library General Public
6    License as published by the Free Software Foundation; either
7    version 2 of the License, or (at your option) any later version.
8
9    This library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Library General Public License for more details.
13
14    You should have received a copy of the GNU Library General Public License
15    along with this library; see the file COPYING.LIB.  If not, write to
16    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17    Boston, MA 02110-1301, USA.
18*/
19
20#ifndef SVGAnimatedPropertySynchronizer_h
21#define SVGAnimatedPropertySynchronizer_h
22
23#include "SVGAnimatedPropertyTraits.h"
24
25#if ENABLE(SVG)
26namespace WebCore {
27
28class SVGElement;
29
30// GetOwnerElementForType implementation
31template<typename OwnerType, bool isDerivedFromSVGElement>
32struct GetOwnerElementForType;
33
34template<typename OwnerType>
35struct GetOwnerElementForType<OwnerType, true> : public Noncopyable {
36    static SVGElement* ownerElement(OwnerType* type)
37    {
38        return type;
39    }
40};
41
42template<typename OwnerType>
43struct GetOwnerElementForType<OwnerType, false> : public Noncopyable {
44    static SVGElement* ownerElement(OwnerType* type)
45    {
46        SVGElement* context = type->contextElement();
47        ASSERT(context);
48        return context;
49    }
50};
51
52// IsDerivedFromSVGElement implementation
53template<typename OwnerType>
54struct IsDerivedFromSVGElement : public Noncopyable {
55    static const bool value = true;
56};
57
58class SVGViewSpec;
59template<>
60struct IsDerivedFromSVGElement<SVGViewSpec> : public Noncopyable {
61    static const bool value = false;
62};
63
64// Helper template used for synchronizing SVG <-> XML properties
65template<bool isDerivedFromSVGElement>
66struct SVGAnimatedPropertySynchronizer {
67    static void synchronize(SVGElement*, const QualifiedName&, const AtomicString&);
68};
69
70template<>
71struct SVGAnimatedPropertySynchronizer<true> {
72    static void synchronize(SVGElement* ownerElement, const QualifiedName& attrName, const AtomicString& value)
73    {
74        NamedNodeMap* namedAttrMap = ownerElement->attributes(false);
75        Attribute* old = namedAttrMap->getAttributeItem(attrName);
76        if (old && value.isNull())
77            namedAttrMap->removeAttribute(old->name());
78        else if (!old && !value.isNull())
79            namedAttrMap->addAttribute(ownerElement->createAttribute(attrName, value));
80        else if (old && !value.isNull())
81            old->setValue(value);
82    }
83};
84
85template<>
86struct SVGAnimatedPropertySynchronizer<false> {
87    static void synchronize(SVGElement*, const QualifiedName&, const AtomicString&)
88    {
89        // no-op, for types not inheriting from Element, thus nothing to synchronize
90    }
91};
92
93};
94
95#endif
96#endif
97