root/Source/modules/filesystem/DOMFileSystem.h

INCLUDED FROM

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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#ifndef DOMFileSystem_h
#define DOMFileSystem_h

#include "bindings/v8/ScriptWrappable.h"
#include "core/dom/ActiveDOMObject.h"
#include "core/dom/ExecutionContext.h"
#include "core/dom/ExecutionContextTask.h"
#include "heap/Handle.h"
#include "modules/filesystem/DOMFileSystemBase.h"
#include "modules/filesystem/EntriesCallback.h"

namespace WebCore {

class DirectoryEntry;
class File;
class FileCallback;
class FileEntry;
class FileWriterCallback;

class DOMFileSystem FINAL : public DOMFileSystemBase, public ScriptWrappable, public ActiveDOMObject {
public:
    static PassRefPtrWillBeRawPtr<DOMFileSystem> create(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);

    // Creates a new isolated file system for the given filesystemId.
    static PassRefPtrWillBeRawPtr<DOMFileSystem> createIsolatedFileSystem(ExecutionContext*, const String& filesystemId);

    PassRefPtrWillBeRawPtr<DirectoryEntry> root();

    // DOMFileSystemBase overrides.
    virtual void addPendingCallbacks() OVERRIDE;
    virtual void removePendingCallbacks() OVERRIDE;
    virtual void reportError(PassOwnPtr<ErrorCallback>, PassRefPtrWillBeRawPtr<FileError>) OVERRIDE;

    // ActiveDOMObject overrides.
    virtual bool hasPendingActivity() const OVERRIDE;

    void createWriter(const FileEntry*, PassOwnPtr<FileWriterCallback>, PassOwnPtr<ErrorCallback>);
    void createFile(const FileEntry*, PassOwnPtr<FileCallback>, PassOwnPtr<ErrorCallback>);

    // Schedule a callback. This should not cross threads (should be called on the same context thread).
    // FIXME: move this to a more generic place.
    template <typename CB, typename CBArg>
    static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, PassRefPtrWillBeRawPtr<CBArg>);

    template <typename CB, typename CBArg>
    static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, const HeapVector<CBArg>&);

    template <typename CB, typename CBArg>
    static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, const CBArg&);

    template <typename CB, typename CBArg>
    void scheduleCallback(PassOwnPtr<CB> callback, PassRefPtrWillBeRawPtr<CBArg> callbackArg)
    {
        scheduleCallback(executionContext(), callback, callbackArg);
    }

    template <typename CB, typename CBArg>
    void scheduleCallback(PassOwnPtr<CB> callback, const CBArg& callbackArg)
    {
        scheduleCallback(executionContext(), callback, callbackArg);
    }

private:
    DOMFileSystem(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);

    // A helper template to schedule a callback task.
    template <typename CB, typename CBArg>
    class DispatchCallbacRefPtrArgTask FINAL : public ExecutionContextTask {
    public:
        DispatchCallbacRefPtrArgTask(PassOwnPtr<CB> callback, PassRefPtrWillBeRawPtr<CBArg> arg)
            : m_callback(callback)
            , m_callbackArg(arg)
        {
        }

        virtual void performTask(ExecutionContext*) OVERRIDE
        {
            m_callback->handleEvent(m_callbackArg.get());
        }

    private:
        OwnPtr<CB> m_callback;
        RefPtrWillBePersistent<CBArg> m_callbackArg;
    };

    template <typename CB, typename CBArg>
    class DispatchCallbackNonPtrArgTask FINAL : public ExecutionContextTask {
    public:
        DispatchCallbackNonPtrArgTask(PassOwnPtr<CB> callback, const CBArg& arg)
            : m_callback(callback)
            , m_callbackArg(arg)
        {
        }

        virtual void performTask(ExecutionContext*) OVERRIDE
        {
            m_callback->handleEvent(m_callbackArg);
        }

    private:
        OwnPtr<CB> m_callback;
        CBArg m_callbackArg;
    };

    int m_numberOfPendingCallbacks;
};

template <typename CB, typename CBArg>
void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, PassRefPtrWillBeRawPtr<CBArg> arg)
{
    ASSERT(executionContext->isContextThread());
    if (callback)
        executionContext->postTask(adoptPtr(new DispatchCallbacRefPtrArgTask<CB, CBArg>(callback, arg)));
}

template <typename CB, typename CBArg>
void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, const HeapVector<CBArg>& arg)
{
    ASSERT(executionContext->isContextThread());
    if (callback)
        executionContext->postTask(adoptPtr(new DispatchCallbackNonPtrArgTask<CB, PersistentHeapVector<CBArg> >(callback, arg)));
}

template <typename CB, typename CBArg>
void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, const CBArg& arg)
{
    ASSERT(executionContext->isContextThread());
    if (callback)
        executionContext->postTask(adoptPtr(new DispatchCallbackNonPtrArgTask<CB, CBArg>(callback, arg)));
}

} // namespace

#endif // DOMFileSystem_h