Package com.mongodb.gridfs

Class GridFSInputFile

  • All Implemented Interfaces:
    DBObject, BSONObject

    public class GridFSInputFile
extends GridFSFile

    This class represents a GridFS file to be written to the database. Operations include:

    • Writing data obtained from an InputStream
    • Getting an OutputStream to stream the data out to
    MongoDB documentation
    GridFS

    • Constructor Detail

      • GridFSInputFile

        protected GridFSInputFile​(GridFS gridFS,
                          InputStream inputStream,
                          String filename,
                          boolean closeStreamOnPersist)
        Default constructor setting the GridFS file name and providing an input stream containing data to be written to the file.
        Parameters:
        gridFS - The GridFS connection handle.
        inputStream - Stream used for reading data from.
        filename - Name of the file to be created.
        closeStreamOnPersist - indicate the passed in input stream should be closed once the data chunk persisted

      • GridFSInputFile

        protected GridFSInputFile​(GridFS gridFS,
                          InputStream inputStream,
                          String filename)
        Default constructor setting the GridFS file name and providing an input stream containing data to be written to the file.
        Parameters:
        gridFS - The GridFS connection handle.
        inputStream - Stream used for reading data from.
        filename - Name of the file to be created.

      • GridFSInputFile

        protected GridFSInputFile​(GridFS gridFS,
                          String filename)
        Constructor that only provides a file name, but does not rely on the presence of an InputStream. An OutputStream can later be obtained for writing using the getOutputStream() method.
        Parameters:
        gridFS - The GridFS connection handle.
        filename - Name of the file to be created.

      • GridFSInputFile

        protected GridFSInputFile​(GridFS gridFS)
        Minimal constructor that does not rely on the presence of an InputStream. An OutputStream can later be obtained for writing using the getOutputStream() method.
        Parameters:
        gridFS - The GridFS connection handle.

    • Method Detail

      • setId

        public void setId​(Object id)
        Sets the ID of this GridFS file.
        Parameters:
        id - the file's ID.

      • setFilename

        public void setFilename​(String filename)
        Sets the file name on the GridFS entry.
        Parameters:
        filename - File name.

      • setContentType

        public void setContentType​(String contentType)
        Sets the content type (MIME type) on the GridFS entry.
        Parameters:
        contentType - Content type.

      • setChunkSize

        public void setChunkSize​(long chunkSize)
        Set the chunk size. This must be called before saving any data.
        Parameters:
        chunkSize - The size in bytes.

      • save

        public void save​(long chunkSize)
        This method first calls saveChunks(long) if the file data has not been saved yet. Then it persists the file entry to GridFS.
        Parameters:
        chunkSize - Size of chunks for file in bytes.
        Throws:
        MongoException - if there's a problem saving the file.

      • saveChunks

        public int saveChunks​(long chunkSize)
               throws IOException
        Saves all data into chunks from configured InputStream input stream to GridFS. A non-default chunk size can be specified. This method does NOT save the file object itself, one must call save() to do so.
        Parameters:
        chunkSize - Size of chunks for file in bytes.
        Returns:
        Number of the next chunk.
        Throws:
        IOException - on problems reading the new entry's InputStream.
        MongoException - if there's a failure

      • getOutputStream

        public OutputStream getOutputStream​()
        After retrieving this OutputStream, this object will be capable of accepting successively written data to the output stream. To completely persist this GridFS object, you must finally call the OutputStream.close() method on the output stream. Note that calling the save() and saveChunks() methods will throw Exceptions once you obtained the OutputStream.
        Returns:
        Writable stream object.

      • createChunk

        protected DBObject createChunk​(Object id,
                               int currentChunkNumber,
                               byte[] writeBuffer)
        Creates a new chunk of this file. Can be over-ridden, if input files need to be split into chunks using a different mechanism.
        Parameters:
        id - the file ID
        currentChunkNumber - the unique id for this chunk
        writeBuffer - the byte array containing the data for this chunk
        Returns:
        a DBObject representing this chunk.