Implement File constructor.

Source/core/fileapi/File.h

 /*
  * Copyright (C) 2008 Apple 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
@@ skipping 31 matching lines @@
     enum ContentTypeLookupPolicy {
         WellKnownContentTypes,
         AllContentTypes,
     };
 
     static PassRefPtr<File> create(const String& path, ContentTypeLookupPolicy policy = WellKnownContentTypes)
     {
         return adoptRef(new File(path, policy));
     }
 
+    static PassRefPtr<File> create(const String& name, double modificationTime, PassRefPtr<BlobDataHandle> blobDataHandle)
+    {
+        return adoptRef(new File(name, modificationTime, blobDataHandle));
+    }
+
     // For deserialization.
     static PassRefPtr<File> create(const String& path, PassRefPtr<BlobDataHandle> blobDataHandle)
     {
         return adoptRef(new File(path, blobDataHandle));
     }
 
     static PassRefPtr<File> createWithRelativePath(const String& path, const String& relativePath);
 
     // If filesystem files live in the remote filesystem, the port might pass the valid metadata (whose length field is non-negative) and cache in the File object.
     //
     // Otherwise calling size(), lastModifiedTime() and slice() will synchronously query the file metadata.
     static PassRefPtr<File> createForFileSystemFile(const String& name, const FileMetadata& metadata)
     {
         return adoptRef(new File(name, metadata));
     }
 
     static PassRefPtr<File> createForFileSystemFile(const KURL& url, const FileMetadata& metadata)
     {
         return adoptRef(new File(url, metadata));
     }
 
-    KURL fileSystemURL() const { return m_fileSystemURL; }
+    KURL fileSystemURL() const { ASSERT(m_hasBackingFile); return m_fileSystemURL; }
 
     // Create a file with a name exposed to the author (via File.name and associated DOM properties) that differs from the one provided in the path.
     static PassRefPtr<File> createWithName(const String& path, const String& name, ContentTypeLookupPolicy policy = WellKnownContentTypes)
     {
         if (name.isEmpty())
             return adoptRef(new File(path, policy));
         return adoptRef(new File(path, name, policy));
     }
 
-    virtual unsigned long long size() const;
-    virtual bool isFile() const { return true; }
+    virtual unsigned long long size() const OVERRIDE;
+    virtual bool isFile() const OVERRIDE { return true; }
+    virtual bool hasBackingFile() const OVERRIDE { return m_hasBackingFile; }
 
-    const String& path() const { return m_path; }
+    const String& path() const { ASSERT(m_hasBackingFile); return m_path; }
     const String& name() const { return m_name; }
 
     // This returns the current date and time if the file's last modifiecation date is not known (per spec: http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate).
     double lastModifiedDate() const;
 
     // Returns the relative path of this file in the context of a directory selection.
     const String& webkitRelativePath() const { return m_relativePath; }
 
     // Note that this involves synchronous file operation. Think twice before calling this function.
     void captureSnapshot(long long& snapshotSize, double& snapshotModificationTime) const;
 
 private:
     File(const String& path, ContentTypeLookupPolicy);
     File(const String& path, const String& name, ContentTypeLookupPolicy);
     File(const String& path, PassRefPtr<BlobDataHandle>);
+    File(const String& name, double modificationTime, PassRefPtr<BlobDataHandle>);
     File(const String& name, const FileMetadata&);
     File(const KURL& fileSystemURL, const FileMetadata&);
 
     // Returns true if this has a valid snapshot metadata (i.e. m_snapshotSize >= 0).
     bool hasValidSnapshotMetadata() const { return m_snapshotSize >= 0; }
 
+    bool m_hasBackingFile;
     String m_path;
     String m_name;
 
     KURL m_fileSystemURL;
 
     // If m_snapshotSize is negative (initialized to -1 by default), the snapshot metadata is invalid and we retrieve the latest metadata synchronously in size(), lastModifiedTime() and slice().
     // Otherwise, the snapshot metadata are used directly in those methods.
     const long long m_snapshotSize;
     const double m_snapshotModificationTime;
 
     String m_relativePath;
 };
 
 inline File* toFile(Blob* blob)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!blob || blob->isFile());
     return static_cast<File*>(blob);
 }
 
 inline const File* toFile(const Blob* blob)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!blob || blob->isFile());
     return static_cast<const File*>(blob);
 }
 
 } // namespace WebCore
 
 #endif // File_h