Package com.adobe.internal.io

Class LazyRandomAccessFileByteWriter

java.lang.Object
com.adobe.internal.io.LazyRandomAccessFileByteWriter
All Implemented Interfaces:
ByteReader, ByteWriter
public class LazyRandomAccessFileByteWriter extends 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

  • Constructor Summary

    Constructors
    Constructor
    Description
    LazyRandomAccessFileByteWriter(File file)
     

  • Method Summary

    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 Details

    • LazyRandomAccessFileByteWriter

      public LazyRandomAccessFileByteWriter(File file) throws IOException
      Parameters:
      file -
      Throws:
      IOException

  • Method Details

    • read

      public int read(long position) throws 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:
      IOException - if an error occurs during the read operation
      See Also:

    • read

      public int read(long position, byte[] b, int offset, int length) throws 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:
      IOException - if an error occurs during the read operation
      See Also:

    • length

      public long length() throws 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:
      IOException - if an error occurs while trying to determine the length
      See Also:

    • close

      public void close() throws 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:
      IOException - if an error occurs while trying to close
      See Also:

    • write

      public void write(long position, int b) throws 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:
      IOException

    • write

      public void write(long position, byte[] b, int offset, int length) throws 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:
      IOException

    • flush

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