Package org.apache.derby.impl.load

Class ImportFileInputStream

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable
    class ImportFileInputStream
extends java.io.InputStream
    An InputStream, which can stream data from a file, starting from any offset in the file. This stream operates on top of a RandomAccessFile object. This class overrides InputStream methods to read from the given RandomAccessFile and provides an addtional method seek(..) to position the stream at offset in the file.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private long currentPosition  
      private long fileLength  
      private java.io.RandomAccessFile raf  

    • Constructor Summary

      Constructors 
      Constructor Description
      ImportFileInputStream​(java.io.RandomAccessFile raf)
      Create a ImportFileInputStream object for the given file.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int available()
      Returns the number of bytes that can be read from this stream.
      void close()
      Closes this input stream and releases any associated resources
      int read()
      Reads a byte of data from this input stream.
      int read​(byte[] buf, int offset, int length)
      Reads up to length bytes of data from this input stream into given array.
      (package private) void seek​(long offset)
      Sets the file offset at which the next read will occur.

      • Methods inherited from class java.io.InputStream

        mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, transferTo

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • raf

        private java.io.RandomAccessFile raf

      • currentPosition

        private long currentPosition

      • fileLength

        private long fileLength

    • Constructor Detail

      • ImportFileInputStream

        ImportFileInputStream​(java.io.RandomAccessFile raf)
               throws java.io.IOException
        Create a ImportFileInputStream object for the given file.
        Parameters:
        raf - file the stream reads from.
        Throws:
        java.io.IOException - if any I/O error occurs.

    • Method Detail

      • seek

        void seek​(long offset)
   throws java.io.IOException
        Sets the file offset at which the next read will occur.
        Parameters:
        offset - byte offset in the file.
        Throws:
        java.io.IOException - if an I/O error occurs.

      • read

        public int read()
         throws java.io.IOException
        Reads a byte of data from this input stream.
        Specified by:
        read in class java.io.InputStream
        Throws:
        java.io.IOException - if an I/O error occurs.

      • read

        public int read​(byte[] buf,
                int offset,
                int length)
         throws java.io.IOException
        Reads up to length bytes of data from this input stream into given array. This method blocks until some input is available.
        Overrides:
        read in class java.io.InputStream
        Parameters:
        buf - the buffer into which the data is read.
        offset - the start offset of the data.
        length - the maximum number of bytes read.
        Returns:
        the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached.
        Throws:
        java.io.IOException - if an I/O error occurs.

      • available

        public int available()
              throws java.io.IOException
        Returns the number of bytes that can be read from this stream.
        Overrides:
        available in class java.io.InputStream
        Returns:
        the number of bytes that can be read from this stream.
        Throws:
        java.io.IOException - if an I/O error occurs.

      • close

        public void close()
           throws java.io.IOException
        Closes this input stream and releases any associated resources
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Overrides:
        close in class java.io.InputStream
        Throws:
        java.io.IOException - if an I/O error occurs.