Transferable (RabbIT/4)
Date: 2009-12-20

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## rabbit.httpio
Interface Transferable

All Known Subinterfaces:
  ResourceSource

All Known Implementing Classes:
  CacheResourceSource, FileResourceSource, RandomCacheResourceSource, WebConnectionResourceSource

    public interface Transferable

The methods needed for fast transferTo.

Author:
  Robert Olofsson

Method Summary
`long` | `length()` Get the length of the resource in bytes.
`long` | `transferTo(long position, long count, WritableByteChannel target)` Transfers bytes from this channel's file to the given writable byte channel.

Method Detail

### length

    long length()

  Get the length of the resource in bytes.

  Returns:
    the size of the resource or -1 if unknown.

### transferTo

    long transferTo(long position,
                    long count,
                    WritableByteChannel target)
                    throws IOException

  Transfers bytes from this channel's file to the given writable byte channel.

  Parameters:
    `position` - The position within the file at which the transfer is to begin; must be non-negative
    `count` - The maximum number of bytes to be transferred; must be non-negative
    `target` - The target channel
  Returns:
    The number of bytes, possibly zero, that were actually transferred
  Throws:
    `IOException`
  See Also:
    `transferTo`

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