BlobstoreFile

com.google.appengine.api.files.dev

Class BlobstoreFile



  • public class BlobstoreFile
    extends FileMetadata
    Represents a file in the local file service that is stored in the BlobStore. For each BlobStore file there are two instances of this class: one corresponding to the creation-handle which is write-only, and one corresponding to the blob key which is read-only. Each instance will eventually contain both the creation handle and the blob key Strings so that it is possible to find one from the other.
    • Field Detail

      • FILE_SYSTEM

        public static final java.lang.String FILE_SYSTEM
      • CREATION_HANDLE_PREFIX

        public static final java.lang.String CREATION_HANDLE_PREFIX
        See Also:
        Constant Field Values
    • Method Detail

      • buildFullPath

        public static java.lang.String buildFullPath(java.lang.String namePart)
      • create

        public static FileMetadata create(LocalFileService localFileService,
                                          Clock clock,
                                          java.lang.String fileName,
                                          java.lang.String randomString,
                                          ContentType contentType,
                                          java.util.Map<java.lang.String,java.lang.String> parameters)
        Creates a new instance for a non-finalized file.
      • newFinalizedInstance

        public static FileMetadata newFinalizedInstance(LocalFileService localFileService,
                                                        Clock clock,
                                                        ParsedFileName parsedName)
        Given a ParsedFileName for a Blobstore file that is expected to have been finalized, this method will attempt to construct and return a new FileMetadata instance for the file. If the file name represents a blob key, then an instance will be returned wrapping the blob key. If the name represents a creation handle then this method will query the datastore in order to find a blob key corresponding to the creation handle. If one is found then an instance will be returned. Otherwise null will be returned.
        Returns:
        An instance of FileMetadata or null if no corresponding entity could be found in the datastore.
      • getBlobInfo

        public com.google.appengine.api.blobstore.BlobInfo getBlobInfo()
        Specified by:
        getBlobInfo in class FileMetadata
        Returns:
        the BlobInfo of the file. File must have been finalized.
      • getOutputStream

        protected java.io.OutputStream getOutputStream()
                                                throws java.io.IOException
        Specified by:
        getOutputStream in class FileMetadata
        Throws:
        java.io.IOException
      • getInputStream

        protected java.io.InputStream getInputStream()
                                              throws java.io.IOException
        Specified by:
        getInputStream in class FileMetadata
        Throws:
        java.io.IOException

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