001/**
002 *
003 * Copyright 2003-2005 Jive Software, 2016-2020 Florian Schmaus.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * 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 */
017package org.jivesoftware.smack.util;
018
019import org.jivesoftware.smack.util.dns.DNSResolver;
020import org.jivesoftware.smack.util.dns.SmackDaneProvider;
021
022/**
023 * Utility class to perform DNS lookups for XMPP services.
024 *
025 * @author Matt Tucker
026 * @author Florian Schmaus
027 */
028public class DNSUtil {
029
030    private static DNSResolver dnsResolver = null;
031    private static SmackDaneProvider daneProvider;
032
033    /**
034     * Set the DNS resolver that should be used to perform DNS lookups.
035     *
036     * @param resolver TODO javadoc me please
037     */
038    public static void setDNSResolver(DNSResolver resolver) {
039        dnsResolver = Objects.requireNonNull(resolver);
040    }
041
042    /**
043     * Returns the current DNS resolved used to perform DNS lookups.
044     *
045     * @return the active DNSResolver
046     */
047    public static DNSResolver getDNSResolver() {
048        return dnsResolver;
049    }
050
051    /**
052     * Set the DANE provider that should be used when DANE is enabled.
053     *
054     * @param daneProvider TODO javadoc me please
055     */
056    public static void setDaneProvider(SmackDaneProvider daneProvider) {
057        DNSUtil.daneProvider = Objects.requireNonNull(daneProvider);
058    }
059
060    /**
061     * Returns the currently active DANE provider used when DANE is enabled.
062     *
063     * @return the active DANE provider
064     */
065    public static SmackDaneProvider getDaneProvider() {
066        return daneProvider;
067    }
068
069}