Class WindowRandomAccessSource

  • All Implemented Interfaces:
    RandomAccessSource

    public class WindowRandomAccessSource
    extends Object
    implements RandomAccessSource
    A RandomAccessSource that wraps another RandomAccessSouce and provides a window of it at a specific offset and over a specific length. Position 0 becomes the offset position in the underlying source.
    Since:
    5.3.5
    • Constructor Detail

      • WindowRandomAccessSource

        public WindowRandomAccessSource​(RandomAccessSource source,
                                        long offset)
        Constructs a new OffsetRandomAccessSource that extends to the end of the underlying source
        Parameters:
        source - the source
        offset - the amount of the offset to use
      • WindowRandomAccessSource

        public WindowRandomAccessSource​(RandomAccessSource source,
                                        long offset,
                                        long length)
        Constructs a new OffsetRandomAccessSource with an explicit length
        Parameters:
        source - the source
        offset - the amount of the offset to use
        length - the number of bytes to be included in this RAS
    • Method Detail

      • get

        public int get​(long position)
                throws IOException
        Gets a byte at the specified position Note that the position will be adjusted to read from the corrected location in the underlying source
        Specified by:
        get in interface RandomAccessSource
        Returns:
        the byte, or -1 if EOF is reached
        Throws:
        IOException
      • get

        public int get​(long position,
                       byte[] bytes,
                       int off,
                       int len)
                throws IOException
        Gets an array at the specified position. If the number of bytes requested cannot be read, the bytes that can be read will be placed in bytes and the number actually read will be returned. Note that the position will be adjusted to read from the corrected location in the underlying source
        Specified by:
        get in interface RandomAccessSource
        Parameters:
        position - the position in the RandomAccessSource to read from
        bytes - output buffer
        off - offset into the output buffer where results will be placed
        len - the number of bytes to read
        Returns:
        the number of bytes actually read, or -1 if the file is at EOF
        Throws:
        IOException
      • length

        public long length()
        Note that the length will be adjusted to read from the corrected location in the underlying source
        Specified by:
        length in interface RandomAccessSource
        Returns:
        the length of this source