    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 */
    018
    019package org.apache.commons.compress.utils;
    020
    021/**
    022 * Utilities for dealing with OSGi environments.
    023 *
    024 * @since 1.21
    025 */
    026public class OsgiUtils {
    027
    028    private static final boolean inOsgiEnvironment;
    029
    030    static {
    031        final Class<?> classloaderClass = OsgiUtils.class.getClassLoader().getClass();
    032        inOsgiEnvironment = isBundleReference(classloaderClass);
    033    }
    034
    035    private static boolean isBundleReference(final Class<?> clazz) {
    036        Class<?> c = clazz;
    037        while (c != null) {
    038            if (c.getName().equals("org.osgi.framework.BundleReference")) {
    039                return true;
    040            }
    041            for (final Class<?> ifc : c.getInterfaces()) {
    042                if (isBundleReference(ifc)) {
    043                    return true;
    044                }
    045            }
    046            c = c.getSuperclass();
    047        }
    048        return false;
    049    }
    050
    051    /**
    052     * Tests if Commons Compress running as an OSGi bundle?
    053     * @return true if Commons Compress running as an OSGi bundle.
    054     */
    055    public static boolean isRunningInOsgiEnvironment() {
    056        return inOsgiEnvironment;
    057    }
    058
    059}