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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package sun.nio;

import java.nio.ByteBuffer;
import java.io.IOException;


This is an interface to adapt existing APIs to use ByteBuffers as the underlying data format. Only the initial producer and final consumer have to be changed.
 For example, the Zip/Jar code supports InputStreams. To make the Zip code use MappedByteBuffers as the underlying data structure, it can create a class of InputStream that wraps the ByteBuffer, and implements the ByteBuffered interface. A co-operating class several layers away can ask the InputStream if it is an instance of ByteBuffered, then call the getByteBuffer() method. 
/** This is an interface to adapt existing APIs to use {@link java.nio.ByteBuffer
 *  <tt>ByteBuffers</tt>} as the underlying
 *  data format.  Only the initial producer and final consumer have to be changed.<p>
 *
 *  For example, the Zip/Jar code supports {@link java.io.InputStream <tt>InputStreams</tt>}.
 *  To make the Zip code use {@link java.nio.MappedByteBuffer <tt>MappedByteBuffers</tt>} as
 *  the underlying data structure, it can create a class of InputStream that wraps the ByteBuffer,
 *  and implements the ByteBuffered interface. A co-operating class several layers
 *  away can ask the InputStream if it is an instance of ByteBuffered, then
 *  call the {@link #getByteBuffer()} method.
 */
public interface ByteBuffered {

     
Returns the ByteBuffer behind this object, if this particular
instance has one. An implementation of getByteBuffer() is allowed
to return null for any reason.

Throws:
Returns: The ByteBuffer, if this particular instance has one,
         or null otherwise.
Since: 1.5
/**
     * Returns the <tt>ByteBuffer</tt> behind this object, if this particular
     * instance has one. An implementation of <tt>getByteBuffer()</tt> is allowed
     * to return <tt>null</tt> for any reason.
     *
     * @return  The <tt>ByteBuffer</tt>, if this particular instance has one,
     *          or <tt>null</tt> otherwise.
     *
     * @throws  IOException
     *          If the ByteBuffer is no longer valid.
     *
     * @since  1.5
     */
    public ByteBuffer getByteBuffer() throws IOException;
}