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jersey-all is a rebundled verison of Jersey as one OSGi bundle.
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package org.jvnet.mimepull;

import java.nio.ByteBuffer;

/**
 * @author Kohsuke Kawaguchi
 * @author Jitendra Kotamraju
 */
interface Data {

    /**
     * size of the chunk given by the parser
     *
     * @return size of the chunk
     */
    int size();

    /**
     * TODO: should the return type be ByteBuffer ??
     * Return part's partial data. The data is read only.
     *
     * @return a byte array which contains {#size()} bytes. The returned
     *         array may be larger than {#size()} bytes and contains data
     *         from offset 0.
     */
    byte[] read();

    /**
     * Write this partial data to a file
     *
     * @param file to which the data needs to be written
     * @return file pointer before the write operation(at which the data is
     *         written from)
     */
    long writeTo(DataFile file);

    /**
     * Factory method to create a Data. The implementation could
     * be file based one or memory based one.
     *
     * @param dataHead start of the linked list of data objects
     * @param buf contains partial content for a part
     * @return Data
     */
    Data createNext(DataHead dataHead, ByteBuffer buf);
}