1 /*

     2     Copyright (C) Research In Motion Limited 2009-2010. 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 JSSVGContextCache_h

    21 #define JSSVGContextCache_h

    22 

    23 #if ENABLE(SVG)

    24 #include "SVGElement.h"

    25 #include <wtf/StdLibExtras.h>

    26 

    27 namespace WebCore {

    28 

    29 class DOMObject;

    30 

    31 class JSSVGContextCache : public Noncopyable {

    32 public:

    33     typedef HashMap<DOMObject*, SVGElement*> WrapperMap;

    34 

    35     static WrapperMap& wrapperMap()

    36     {

    37         DEFINE_STATIC_LOCAL(WrapperMap, s_wrapperMap, ());

    38         return s_wrapperMap;

    39     }

    40 

    41     static void addWrapper(DOMObject* wrapper, SVGElement* context)

    42     {

    43         ASSERT(wrapper);

    44         ASSERT(context);

    45 

    46         pair<WrapperMap::iterator, bool> result = wrapperMap().add(wrapper, context);

    47         if (result.second) {

    48             WrapperMap::iterator& it = result.first;

    49             ASSERT_UNUSED(it, it->second == context);

    50         }

    51     }

    52 

    53     static void forgetWrapper(DOMObject* wrapper)

    54     {

    55         ASSERT(wrapper);

    56 

    57         WrapperMap& map = wrapperMap();

    58         WrapperMap::iterator it = map.find(wrapper);

    59         if (it == map.end())

    60             return;

    61 

    62         map.remove(it);

    63     }

    64 

    65     static void propagateSVGDOMChange(DOMObject* wrapper, const QualifiedName& attributeName)

    66     {

    67         WrapperMap& map = wrapperMap();

    68         WrapperMap::iterator it = map.find(wrapper);

    69         if (it == map.end())

    70             return;

    71 

    72         SVGElement* context = it->second;

    73         ASSERT(context);

    74 

    75         context->svgAttributeChanged(attributeName);

    76     }

    77 

    78     static SVGElement* svgContextForDOMObject(DOMObject* wrapper)

    79     {

    80         ASSERT(wrapper);

    81 

    82         WrapperMap& map = wrapperMap();

    83         WrapperMap::iterator it = map.find(wrapper);

    84         if (it == map.end())

    85             return 0;

    86 

    87         SVGElement* context = it->second;

    88         ASSERT(context);

    89         return context;

    90     }

    91 

    92 };

    93 

    94 }

    95 

    96 #endif

    97 #endif