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Apache Commons Compress defines an API for working with compression and archive formats. These include bzip2, gzip, pack200, LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.compress.utils;

/**
 * Utilities for dealing with OSGi environments.
 *
 * @since 1.21
 */
public class OsgiUtils {

    private static final boolean inOsgiEnvironment;

    static {
        final ClassLoader classLoader = OsgiUtils.class.getClassLoader();
        inOsgiEnvironment = classLoader != null ? isBundleReference(classLoader.getClass()) : false;
    }

    private static boolean isBundleReference(final Class clazz) {
        Class c = clazz;
        while (c != null) {
            if (c.getName().equals("org.osgi.framework.BundleReference")) {
                return true;
            }
            for (final Class ifc : c.getInterfaces()) {
                if (isBundleReference(ifc)) {
                    return true;
                }
            }
            c = c.getSuperclass();
        }
        return false;
    }

    /**
     * Tests if Commons Compress running as an OSGi bundle?
     *
     * @return true if Commons Compress running as an OSGi bundle.
     */
    public static boolean isRunningInOsgiEnvironment() {
        return inOsgiEnvironment;
    }

}