Package javax.mail.internet

## Interface SharedInputStream

All Known Implementing Classes:
  `SharedByteArrayInputStream`, `SharedFileInputStream`

    public interface SharedInputStream

An InputStream that is backed by data that can be shared by multiple readers may implement this interface. This allows users of such an InputStream to determine the current position in the InputStream, and to create new InputStreams representing a subset of the data in the original InputStream. The new InputStream will access the same underlying data as the original, without copying the data.

Note that implementations of this interface must ensure that the `close` method does not close any underlying stream that might be shared by multiple instances of `SharedInputStream` until all shared instances have been closed.

Since:
  JavaMail 1.2
Author:
  Bill Shannon

### Method Summary

All Methods Instance Methods Abstract Methods
`long` `getPosition()` Return the current position in the InputStream, as an offset from the beginning of the InputStream.
`java.io.InputStream` `newStream​(long start, long end)` Return a new InputStream representing a subset of the data from this InputStream, starting at `start` (inclusive) up to `end` (exclusive).

### Method Detail

#### getPosition

    long getPosition()

Return the current position in the InputStream, as an offset from the beginning of the InputStream.

Returns:
  the current position

#### newStream

    java.io.InputStream newStream​(long start,
                                  long end)

Return a new InputStream representing a subset of the data from this InputStream, starting at `start` (inclusive) up to `end` (exclusive). `start` must be non-negative. If `end` is -1, the new stream ends at the same place as this stream. The returned InputStream will also implement the SharedInputStream interface.

Parameters:
  `start` - the starting position
  `end` - the ending position + 1
Returns:
  the new stream