jetty-osgi/jetty-osgi-boot/src/main/java/org/eclipse/jetty/osgi/boot/utils/BundleClassLoaderHelper.java

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//  Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
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//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
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//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
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//  You may elect to redistribute this code under either of these licenses.
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package org.eclipse.jetty.osgi.boot.utils;

import org.eclipse.jetty.osgi.boot.utils.internal.DefaultBundleClassLoaderHelper;
import org.osgi.framework.Bundle;

/**
 * 
 * BundleClassLoaderHelper
 * 
 * 
 * Is there a clean OSGi way to go from the Bundle object to the classloader of
 * the Bundle ? You can certainly take a class inside the bundle and get the
 * bundle's classloader that way. Getting the classloader directly from the
 * bundle would be nice.
 * <p>
 * We could use fragments that are specific to each OSGi implementation. Using
 * introspection here to keep packaging simple and avoid the multiplication of
 * the jars.
 * </p>
 * <p>
 * The default implementation relies on introspection and supports equinox-3.5
 * and felix-2.0.0
 * </p>
 */
public interface BundleClassLoaderHelper
{

    /** The name of the custom implementation for this interface in a fragment. */
    public static final String CLASS_NAME = "org.eclipse.jetty.osgi.boot.utils.BundleClassLoaderHelperImpl";

    /** The default instance supports felix and equinox */
    public static BundleClassLoaderHelper DEFAULT = new DefaultBundleClassLoaderHelper();

    /**
     * @return The classloader of a given bundle. Assuming the bundle is
     *         started.
     */
    public ClassLoader getBundleClassLoader(Bundle bundle);

}