Package com.itextpdf.io.source

Class FileChannelRandomAccessSource

java.lang.Object
com.itextpdf.io.source.FileChannelRandomAccessSource
All Implemented Interfaces:
IRandomAccessSource
public class FileChannelRandomAccessSource extends Object implements IRandomAccessSource
A RandomAccessSource that is based on an underlying FileChannel. The entire channel will be mapped into memory for efficient reads.

  • Constructor Details

    • FileChannelRandomAccessSource

      public FileChannelRandomAccessSource (FileChannel channel) throws IOException
      Constructs a new FileChannelRandomAccessSource based on the specified FileChannel. The entire source channel will be mapped into memory.
      Parameters:
      channel - the channel to use as the backing store
      Throws:
      IOException - if the channel cannot be opened or mapped

  • Method Details

    • close

      public void close() throws IOException
      Closes this source. The underlying data structure or source (if any) will also be closed Cleans the mapped byte buffers and closes the channel
      Specified by:
      close in interface IRandomAccessSource
      Throws:
      IOException - in case of any reading error.

    • get

      public int get (long position) throws IOException
      Gets a byte at the specified position
      Specified by:
      get in interface IRandomAccessSource
      Parameters:
      position - byte position
      Returns:
      the byte, or -1 if EOF is reached
      Throws:
      IOException - in case of any reading error.

    • get

      public int get (long position, byte[] bytes, int off, int len) throws IOException
      Read an array of bytes of specified length from the specified position of source to the buffer applying the offset. If the number of bytes requested cannot be read, all the possible bytes will be read to the buffer, and the number of actually read bytes will be returned.
      Specified by:
      get in interface IRandomAccessSource
      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 - in case of any I/O error.

    • length

      public long length()
      Gets the length of the source
      Specified by:
      length in interface IRandomAccessSource
      Returns:
      the length of this source