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 (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}