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jersey-all is a rebundled verison of Jersey as one OSGi bundle.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 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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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
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 * enclosed by brackets [] replaced by your own identifying information:
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 */
package org.glassfish.jersey.media.multipart;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

import javax.ws.rs.core.MediaType;

/**
 * Utility for creating boundary parameters.
 *
 * @author Paul Sandoz (paul.sandoz at oracle.com)
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public final class Boundary {

    public static final String BOUNDARY_PARAMETER = "boundary";

    private static final AtomicInteger boundaryCounter = new AtomicInteger();

    /**
     * Transforms a media type and add a boundary parameter with a unique value
     * if one is not already present.
     *
     * @param mediaType if {@code null} then a media type of "multipart/mixed" with a boundary parameter will be returned.
     * @return the media type with a boundary parameter.
     */
    public static MediaType addBoundary(MediaType mediaType) {
        if (mediaType == null) {
            return MultiPartMediaTypes.createMixed();
        }

        if (!mediaType.getParameters().containsKey(BOUNDARY_PARAMETER)) {
            final Map parameters = new HashMap(
                    mediaType.getParameters());
            parameters.put(BOUNDARY_PARAMETER, createBoundary());

            return new MediaType(mediaType.getType(), mediaType.getSubtype(),
                    parameters);
        }

        return mediaType;
    }

    /**
     * Creates a unique boundary.
     *
     * @return the boundary.
     */
    public static String createBoundary() {
        return new StringBuilder("Boundary_")
                .append(boundaryCounter.incrementAndGet())
                .append('_')
                .append(new Object().hashCode())
                .append('_')
                .append(System.currentTimeMillis())
                .toString();
    }

}