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jersey-min is a rebundled (minmal) verison of Jersey as one OSGi bundle.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
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 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
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 */

package org.jvnet.mimepull;

import java.nio.ByteBuffer;

/**
 * Keeps the Part's partial content data in a file.
 *
 * @author Kohsuke Kawaguchi
 * @author Jitendra Kotamraju
 */
final class FileData implements Data {
    private final DataFile file;
    private final long pointer;         // read position
    private final int length;

    FileData(DataFile file, ByteBuffer buf) {
        this(file, file.writeTo(buf.array(), 0, buf.limit()), buf.limit());
    }

    FileData(DataFile file, long pointer, int length) {
        this.file = file;
        this.pointer = pointer;
        this.length = length;
    }

    @Override
    public byte[] read() {
        byte[] buf = new byte[length];
        file.read(pointer, buf, 0, length);
        return buf;
    }

    /*
     * This shouldn't be called
     */
    @Override
    public long writeTo(DataFile file) {
        throw new IllegalStateException();
    }

    @Override
    public int size() {
        return length;
    }

    /*
     * Always create FileData
     */
    @Override
    public Data createNext(DataHead dataHead, ByteBuffer buf) {
        return new FileData(file, buf);
    }
}