    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *   http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.compress.utils;
    019
    020/**
    021 * Utilities for dealing with OSGi environments.
    022 *
    023 * @since 1.21
    024 */
    025public class OsgiUtils {
    026
    027    private static final boolean inOsgiEnvironment;
    028
    029    static {
    030        final ClassLoader classLoader = OsgiUtils.class.getClassLoader();
    031        inOsgiEnvironment = classLoader != null && isBundleReference(classLoader.getClass());
    032    }
    033
    034    private static boolean isBundleReference(final Class<?> clazz) {
    035        Class<?> c = clazz;
    036        while (c != null) {
    037            if (c.getName().equals("org.osgi.framework.BundleReference")) {
    038                return true;
    039            }
    040            for (final Class<?> ifc : c.getInterfaces()) {
    041                if (isBundleReference(ifc)) {
    042                    return true;
    043                }
    044            }
    045            c = c.getSuperclass();
    046        }
    047        return false;
    048    }
    049
    050    /**
    051     * Tests if Commons Compress running as an OSGi bundle?
    052     *
    053     * @return true if Commons Compress running as an OSGi bundle.
    054     */
    055    public static boolean isRunningInOsgiEnvironment() {
    056        return inOsgiEnvironment;
    057    }
    058
    059}