1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef NullExecutionContext_h
6#define NullExecutionContext_h
7
8#include "core/dom/ExecutionContext.h"
9#include "core/dom/SecurityContext.h"
10#include "core/events/EventQueue.h"
11#include "platform/heap/Handle.h"
12#include "platform/weborigin/KURL.h"
13#include "wtf/RefCounted.h"
14
15namespace blink {
16
17class NullExecutionContext FINAL : public RefCountedWillBeGarbageCollectedFinalized<NullExecutionContext>, public SecurityContext, public ExecutionContext {
18    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NullExecutionContext);
19public:
20    NullExecutionContext();
21
22    virtual void disableEval(const String&) OVERRIDE { }
23    virtual String userAgent(const KURL&) const OVERRIDE { return String(); }
24
25    virtual void postTask(PassOwnPtr<ExecutionContextTask>) OVERRIDE;
26
27    virtual EventTarget* errorEventTarget() OVERRIDE { return 0; }
28    virtual EventQueue* eventQueue() const OVERRIDE { return m_queue.get(); }
29
30    virtual bool tasksNeedSuspension() OVERRIDE { return m_tasksNeedSuspension; }
31    void setTasksNeedSuspension(bool flag) { m_tasksNeedSuspension = flag; }
32
33    virtual void reportBlockedScriptExecutionToInspector(const String& directiveText) OVERRIDE { }
34    virtual void didUpdateSecurityOrigin() OVERRIDE { }
35    virtual SecurityContext& securityContext() OVERRIDE { return *this; }
36
37    double timerAlignmentInterval() const;
38
39    virtual void addConsoleMessage(PassRefPtrWillBeRawPtr<ConsoleMessage>) OVERRIDE { }
40    virtual void logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>) OVERRIDE { }
41
42    void trace(Visitor* visitor)
43    {
44        visitor->trace(m_queue);
45        ExecutionContext::trace(visitor);
46    }
47
48#if !ENABLE(OILPAN)
49    using RefCounted<NullExecutionContext>::ref;
50    using RefCounted<NullExecutionContext>::deref;
51
52    virtual void refExecutionContext() OVERRIDE { ref(); }
53    virtual void derefExecutionContext() OVERRIDE { deref(); }
54#endif
55
56protected:
57    virtual const KURL& virtualURL() const OVERRIDE { return m_dummyURL; }
58    virtual KURL virtualCompleteURL(const String&) const OVERRIDE { return m_dummyURL; }
59
60private:
61    bool m_tasksNeedSuspension;
62    OwnPtrWillBeMember<EventQueue> m_queue;
63
64    KURL m_dummyURL;
65};
66
67} // namespace blink
68
69#endif // NullExecutionContext_h
70