Package com.adobe.internal.io

Class LazyRandomAccessFileByteWriter

  • All Implemented Interfaces:
    ByteReader, ByteWriter
    public class LazyRandomAccessFileByteWriter
extends java.lang.Object
implements ByteWriter
    An implementation of the ByteWriter interface that provides lazy access to a RandomAccessFile. It will not open the File until the first attempt to read or operate on that File. At that point a RandomAccessFileByteReader will be constructed and used. This class is not threadsafe. It is not safe to pass an instance of this class to multiple threads. It is not safe to pass an instance of this class to multiple users even if in the same thread.

    • Field Summary

      • Fields inherited from interface com.adobe.internal.io.ByteReader

        EOF

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()
      Closes this ByteReader and releases any system resources associated with this stream.
      void flush()
      Flushes this ByteWriter and forces any buffered output bytes to be written out.
      long length()
      Returns the number of total bytes in the repository that are visible through this API.
      int read​(long position)
      Read a single byte from the underlying bytes at the given position.
      int read​(long position, byte[] b, int offset, int length)
      Transfers bytes from the underlying repository into the given destination array.
      void write​(long position, byte[] b, int offset, int length)
      Write an array of bytes at the position given.
      void write​(long position, int b)
      Write the byte given at the position given.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • LazyRandomAccessFileByteWriter

        public LazyRandomAccessFileByteWriter​(java.io.File file)
                               throws java.io.IOException
        Parameters:
        file -
        Throws:
        java.io.IOException

    • Method Detail

      • read

        public int read​(long position)
         throws java.io.IOException
        Description copied from interface: ByteReader
        Read a single byte from the underlying bytes at the given position.
        Specified by:
        read in interface ByteReader
        Parameters:
        position - the position to read the byte from.
        Returns:
        the byte at the postion or EOF if the position is outside of the legal range.
        Throws:
        java.io.IOException - if an error occurs during the read operation
        See Also:
        ByteReader.read(long)

      • read

        public int read​(long position,
                byte[] b,
                int offset,
                int length)
         throws java.io.IOException
        Description copied from interface: ByteReader
        Transfers bytes from the underlying repository into the given destination array. Copy up to length bytes from the repository starting at the postion given into the given array starting at the given offset.
        Specified by:
        read in interface ByteReader
        Parameters:
        position - the position to read the byte from.
        b - the array to write the bytes into.
        offset - the offset in the array at which the first byte is written.
        length - the maximum number of bytes to write into the array.
        Returns:
        the number of bytes actually written to the array.
        Throws:
        java.io.IOException - if an error occurs during the read operation
        See Also:
        ByteReader.read(long, byte[], int, int)

      • length

        public long length()
            throws java.io.IOException
        Description copied from interface: ByteReader
        Returns the number of total bytes in the repository that are visible through this API.
        Specified by:
        length in interface ByteReader
        Returns:
        the number of bytes in the repository.
        Throws:
        java.io.IOException - if an error occurs while trying to determine the length
        See Also:
        ByteReader.length()

      • close

        public void close()
           throws java.io.IOException
        Description copied from interface: ByteReader
        Closes this ByteReader and releases any system resources associated with this stream.
        Specified by:
        close in interface ByteReader
        Throws:
        java.io.IOException - if an error occurs while trying to close
        See Also:
        ByteReader.close()

      • write

        public void write​(long position,
                  int b)
           throws java.io.IOException
        Write the byte given at the position given.
        Specified by:
        write in interface ByteWriter
        Parameters:
        position - the zero-based offset within the byte array.
        b - the byte to write.
        Throws:
        java.io.IOException

      • write

        public void write​(long position,
                  byte[] b,
                  int offset,
                  int length)
           throws java.io.IOException
        Write an array of bytes at the position given.
        Specified by:
        write in interface ByteWriter
        Parameters:
        position - the zero-based offset within the byte array.
        b - the array of bytes to write from.
        offset - the offset within the byte array to start writing from.
        length - the number of bytes to write from the byte array.
        Throws:
        java.io.IOException

      • flush

        public void flush()
           throws java.io.IOException
        Flushes this ByteWriter and forces any buffered output bytes to be written out.
        Specified by:
        flush in interface ByteWriter
        Throws:
        java.io.IOException