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/*
* Copyright (C) 2012 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 ContextFeatures_h
#define ContextFeatures_h
#include "core/CoreExport.h"
#include "core/page/Page.h"
#include "platform/heap/Handle.h"
#include <memory>
namespace blink {
class ContextFeaturesClient;
class Document;
class Page;
class ContextFeatures final : public GarbageCollectedFinalized<ContextFeatures>,
public Supplement<Page> {
USING_GARBAGE_COLLECTED_MIXIN(ContextFeatures);
public:
enum FeatureType {
PagePopup = 0,
MutationEvents,
FeatureTypeSize // Should be the last entry.
};
static const char* supplementName();
static ContextFeatures& defaultSwitch();
static ContextFeatures* create(std::unique_ptr<ContextFeaturesClient>);
static bool pagePopupEnabled(Document*);
static bool mutationEventsEnabled(Document*);
bool isEnabled(Document*, FeatureType, bool) const;
void urlDidChange(Document*);
private:
explicit ContextFeatures(std::unique_ptr<ContextFeaturesClient> client)
: m_client(std::move(client)) {}
std::unique_ptr<ContextFeaturesClient> m_client;
};
class ContextFeaturesClient {
USING_FAST_MALLOC(ContextFeaturesClient);
public:
static std::unique_ptr<ContextFeaturesClient> empty();
virtual ~ContextFeaturesClient() {}
virtual bool isEnabled(Document*,
ContextFeatures::FeatureType,
bool defaultValue) {
return defaultValue;
}
virtual void urlDidChange(Document*) {}
};
CORE_EXPORT void provideContextFeaturesTo(
Page&,
std::unique_ptr<ContextFeaturesClient>);
void provideContextFeaturesToDocumentFrom(Document&, Page&);
inline ContextFeatures* ContextFeatures::create(
std::unique_ptr<ContextFeaturesClient> client) {
return new ContextFeatures(std::move(client));
}
inline bool ContextFeatures::isEnabled(Document* document,
FeatureType type,
bool defaultValue) const {
if (!m_client)
return defaultValue;
return m_client->isEnabled(document, type, defaultValue);
}
inline void ContextFeatures::urlDidChange(Document* document) {
// FIXME: The original code, commented out below, is obviously
// wrong, but the seemingly correct fix of negating the test to
// the more logical 'if (!m_client)' crashes the renderer.
// See issue 294180
//
// if (m_client)
// return;
// m_client->urlDidChange(document);
}
} // namespace blink
#endif // ContextFeatures_h
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