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}