/*
 * 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
 *
 *   https://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());
    }

    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;
    }

}
