/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef V8ValueCache_h
#define V8ValueCache_h
#include "bindings/v8/UnsafePersistent.h"
#include <v8.h>
#include "wtf/HashMap.h"
#include "wtf/RefPtr.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class StringCache {
public:
StringCache() { }
v8::Handle<v8::String> v8ExternalString(StringImpl* stringImpl, v8::Isolate* isolate)
{
ASSERT(stringImpl);
if (m_lastStringImpl.get() == stringImpl)
return m_lastV8String.newLocal(isolate);
return v8ExternalStringSlow(stringImpl, isolate);
}
void setReturnValueFromString(v8::ReturnValue<v8::Value> returnValue, StringImpl* stringImpl)
{
ASSERT(stringImpl);
if (m_lastStringImpl.get() == stringImpl)
returnValue.Set(*m_lastV8String.persistent());
else
setReturnValueFromStringSlow(returnValue, stringImpl);
}
private:
static void setWeakCallback(const v8::WeakCallbackData<v8::String, StringImpl>&);
v8::Handle<v8::String> v8ExternalStringSlow(StringImpl*, v8::Isolate*);
void setReturnValueFromStringSlow(v8::ReturnValue<v8::Value>, StringImpl*);
v8::Local<v8::String> createStringAndInsertIntoCache(StringImpl*, v8::Isolate*);
HashMap<StringImpl*, UnsafePersistent<v8::String> > m_stringCache;
UnsafePersistent<v8::String> m_lastV8String;
// Note: RefPtr is a must as we cache by StringImpl* equality, not identity
// hence lastStringImpl might be not a key of the cache (in sense of identity)
// and hence it's not refed on addition.
RefPtr<StringImpl> m_lastStringImpl;
};
} // namespace WebCore
#endif // V8ValueCache_h