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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 qcloud.storage.ranger.thirdparty.org.apache.zookeeper.server.auth;

import java.util.Enumeration;
import java.util.HashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import qcloud.storage.ranger.thirdparty.org.apache.zookeeper.server.ZooKeeperServer;

public class ProviderRegistry {
    private static final Logger LOG = LoggerFactory.getLogger(ProviderRegistry.class);

    private static boolean initialized = false;
    private static HashMap authenticationProviders =
        new HashMap();

    public static void initialize() {
        synchronized (ProviderRegistry.class) {
            if (initialized)
                return;
            IPAuthenticationProvider ipp = new IPAuthenticationProvider();
            DigestAuthenticationProvider digp = new DigestAuthenticationProvider();
            authenticationProviders.put(ipp.getScheme(), ipp);
            authenticationProviders.put(digp.getScheme(), digp);
            Enumeration