src/java.base/share/classes/sun/nio/ByteBuffered.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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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 {@link java.nio.ByteBuffer
 *  ByteBuffers} 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 InputStreams}.
 *  To make the Zip code use {@link java.nio.MappedByteBuffer 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 {@link #getByteBuffer()} method.
 */
public interface ByteBuffered {

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     *          If the ByteBuffer is no longer valid.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