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/*
* @(#)SharedInputStream.java 1.5 07/05/04
*/
package javax.mail.internet;
import java.io.*;
/**
* 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. <p>
*
* Note that implementations of this interface must ensure that the
* <code>close</code> method does not close any underlying stream
* that might be shared by multiple instances of <code>SharedInputStream</code>
* until all shared instances have been closed.
*
* @version 1.5, 07/05/04
* @author Bill Shannon
* @since JavaMail 1.2
*/
public interface SharedInputStream {
/**
* Return the current position in the InputStream, as an
* offset from the beginning of the InputStream.
*
* @return the current position
*/
public long getPosition();
/**
* Return a new InputStream representing a subset of the data
* from this InputStream, starting at <code>start</code> (inclusive)
* up to <code>end</code> (exclusive). <code>start</code> must be
* non-negative. If <code>end</code> is -1, the new stream ends
* at the same place as this stream. The returned InputStream
* will also implement the SharedInputStream interface.
*
* @param start the starting position
* @param end the ending position + 1
* @return the new stream
*/
public InputStream newStream(long start, long end);
}
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