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}