1 files changed, 185 insertions, 0 deletions
diff --git a/WebCore/fileapi/SyncCallbackHelper.h b/WebCore/fileapi/SyncCallbackHelper.h
new file mode 100644
index 0000000..1612e93
--- /dev/null
+++ b/WebCore/fileapi/SyncCallbackHelper.h
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2010 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.
+ *     * 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.
+ *     * 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 SyncCallbackHelper_h
+#define SyncCallbackHelper_h
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "DirectoryEntry.h"
+#include "EntriesCallback.h"
+#include "EntryArraySync.h"
+#include "EntryCallback.h"
+#include "ErrorCallback.h"
+#include "ExceptionCode.h"
+#include "FileEntry.h"
+#include "FileError.h"
+#include "FileSystemCallback.h"
+#include "MetadataCallback.h"
+#include "VoidCallback.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class AsyncFileSystem;
+class DirectoryEntrySync;
+class EntryArraySync;
+class EntrySync;
+class FileEntrySync;
+
+// A helper template for FileSystemSync implementation.
+template <typename SuccessCallback, typename ObserverType, typename CallbackArg, typename ResultType>
+class SyncCallbackHelper : public Noncopyable {
+public:
+    typedef SyncCallbackHelper<SuccessCallback, ObserverType, CallbackArg, ResultType> HelperType;
+    SyncCallbackHelper(ObserverType* observer = 0)
+        : m_observer(observer)
+        , m_successCallback(SuccessCallbackImpl::create(this))
+        , m_errorCallback(ErrorCallbackImpl::create(this))
+        , m_error(0)
+        , m_completed(false)
+    {
+    }
+
+    PassRefPtr<ResultType> getResult(ExceptionCode& ec)
+    {
+        if (m_observer) {
+            while (!m_completed) {
+                if (!m_observer->waitForOperationToComplete()) {
+                    m_error = ABORT_ERR;
+                    break;
+                }
+            }
+        }
+        ec = m_error;
+        return m_result.release();
+    }
+
+    PassRefPtr<SuccessCallback> successCallback() { return m_successCallback; }
+    PassRefPtr<ErrorCallback> errorCallback() { return m_errorCallback; }
+
+private:
+    class SuccessCallbackImpl : public SuccessCallback {
+    public:
+        static PassRefPtr<SuccessCallbackImpl> create(HelperType* helper)
+        {
+            return adoptRef(new SuccessCallbackImpl(helper));
+        }
+
+        virtual void handleEvent()
+        {
+            m_helper->setError(0);
+        }
+
+        virtual bool handleEvent(CallbackArg* arg)
+        {
+            m_helper->setResult(ResultType::create(arg));
+            return true;
+        }
+
+    private:
+        SuccessCallbackImpl(HelperType* helper)
+            : m_helper(helper)
+        {
+        }
+        HelperType* m_helper;
+    };
+
+    class ErrorCallbackImpl : public ErrorCallback {
+    public:
+        static PassRefPtr<ErrorCallbackImpl> create(HelperType* helper)
+        {
+            return adoptRef(new ErrorCallbackImpl(helper));
+        }
+
+        virtual bool handleEvent(FileError* error)
+        {
+            ASSERT(error);
+            m_helper->setError(error->code());
+            return true;
+        }
+
+    private:
+        ErrorCallbackImpl(HelperType* helper)
+            : m_helper(helper)
+        {
+        }
+        HelperType* m_helper;
+    };
+
+    friend class SuccessCallbackImpl;
+    friend class ErrorCallbackImpl;
+
+    void setError(ExceptionCode ec)
+    {
+        m_error = ec;
+        m_completed = true;
+    }
+
+    void setResult(PassRefPtr<ResultType> result)
+    {
+        m_result = result;
+        m_completed = true;
+    }
+
+    ObserverType* m_observer;
+    RefPtr<SuccessCallbackImpl> m_successCallback;
+    RefPtr<ErrorCallbackImpl> m_errorCallback;
+    RefPtr<ResultType> m_result;
+    ExceptionCode m_error;
+    bool m_completed;
+};
+
+struct EmptyType : public RefCounted<EmptyType> {
+    static PassRefPtr<EmptyType> create(EmptyType*)
+    {
+        return 0;
+    }
+};
+
+struct EmptyObserverType {
+    bool waitForOperationToComplete()
+    {
+        return false;
+    }
+};
+
+typedef SyncCallbackHelper<EntryCallback, AsyncFileSystem, Entry, EntrySync> EntrySyncCallbackHelper;
+typedef SyncCallbackHelper<EntriesCallback, AsyncFileSystem, EntryArray, EntryArraySync> EntriesSyncCallbackHelper;
+typedef SyncCallbackHelper<MetadataCallback, AsyncFileSystem, Metadata, Metadata> MetadataSyncCallbackHelper;
+typedef SyncCallbackHelper<VoidCallback, AsyncFileSystem, EmptyType, EmptyType> VoidSyncCallbackHelper;
+typedef SyncCallbackHelper<FileSystemCallback, EmptyObserverType, DOMFileSystem, DOMFileSystemSync> FileSystemSyncCallbackHelper;
+
+} // namespace WebCore
+
+#endif // ENABLE(FILE_SYSTEM)
+
+#endif // SyncCallbackHelper_h