    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019
    020package org.apache.commons.compress.utils;
    021
    022/**
    023 * Utilities for dealing with OSGi environments.
    024 *
    025 * @since 1.21
    026 */
    027public class OsgiUtils {
    028
    029    private static final boolean inOsgiEnvironment;
    030
    031    static {
    032        final ClassLoader classLoader = OsgiUtils.class.getClassLoader();
    033        inOsgiEnvironment = classLoader != null && isBundleReference(classLoader.getClass());
    034    }
    035
    036    private static boolean isBundleReference(final Class<?> clazz) {
    037        Class<?> c = clazz;
    038        while (c != null) {
    039            if (c.getName().equals("org.osgi.framework.BundleReference")) {
    040                return true;
    041            }
    042            for (final Class<?> ifc : c.getInterfaces()) {
    043                if (isBundleReference(ifc)) {
    044                    return true;
    045                }
    046            }
    047            c = c.getSuperclass();
    048        }
    049        return false;
    050    }
    051
    052    /**
    053     * Tests if Commons Compress running as an OSGi bundle?
    054     *
    055     * @return true if Commons Compress running as an OSGi bundle.
    056     */
    057    public static boolean isRunningInOsgiEnvironment() {
    058        return inOsgiEnvironment;
    059    }
    060
    061}