Module datarush.commons
Package com.pervasive.datarush.io

Class SplittableCompressedFileSplit

  • All Implemented Interfaces:
    DataSplit, Serializable
    public class SplittableCompressedFileSplit
extends FileSplit
    Represents a file split for a compression format that supports splitting. The CompressedFileSplit only works with formats that do not support splitting (i.e. one split is used that represents the whole file).
    See Also:
    Serialized Form

    • Constructor Detail

      • SplittableCompressedFileSplit

        public SplittableCompressedFileSplit​(Path path,
                                     long startOffset,
                                     long length,
                                     CompressionFormat format)
        Construct an instance.
        Parameters:
        path - path to the file to read
        startOffset - starting offset of this split within the file
        length - length (in bytes) of the split
        format - compression format (must support splitting)

    • Method Detail

      • authorize

        public FileSplit authorize​(FileClient client)
        Description copied from interface: DataSplit
        Creates an identical split which will use the specified authorization context for access.

        This method is used by clients of the IO APIs which want to provide an alternative to the OS-level authorization inherited from the JVM's execution environment. Data access methods for the split will use the supplied context.

        The authorization context is not a serializable attribute of a data split, as it represents the environment in which the data in accesses, not a property of the data itself. The context is associated with the split as a matter of convenience.

        Specified by:
        authorize in interface DataSplit
        Overrides:
        authorize in class FileSplit
        Parameters:
        client - the authorization context to use for access
        Returns:
        a split using the provided authorization context

      • openSource

        public InputStream openSource()
                       throws IOException
        Description copied from interface: DataSplit
        Opens the underlying source for access. Initially, the stream is positioned at the first byte of the source. Unlike DataSplit.openSplit(int), the caller is responsible for making sure accesses are aligned to split boundaries. The stream is also unbuffered.

        This method may be required for dealing with formats which store metadata at the beginning of the file.

        Specified by:
        openSource in interface DataSplit
        Overrides:
        openSource in class FileSplit
        Returns:
        a reader of the data in the underlying source
        Throws:
        IOException - if an I/O error occurs opening the underlying source

      • openSplit

        public SplitInputStream openSplit​(int buffer)
                           throws IOException
        Description copied from interface: DataSplit
        Opens the split for reading using the specified size for the read buffer. The reader will initially be positioned at the first byte of the split. The reader will indicate when the last byte of the split has been read via SplitInputStreamImpl.hasOverrun().
        Specified by:
        openSplit in interface DataSplit
        Overrides:
        openSplit in class FileSplit
        Parameters:
        buffer - the size of the buffer to use for reads, in bytes
        Returns:
        a reader of the data in the split
        Throws:
        IOException - if an I/O error occurs opening the underlying source

      • getCompressionFormat

        public CompressionFormat getCompressionFormat()
        Get the compression format.
        Returns:
        compressionFormat