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Java example source code file (DefaultDnsPtrRecord.java)

This example Java source code file (DefaultDnsPtrRecord.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractdnsrecord, defaultdnsptrrecord, dnsrecordtype, override, string, stringbuilder, unstableapi

The DefaultDnsPtrRecord.java Java example source code

/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project 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 io.netty.handler.codec.dns;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

import io.netty.util.internal.StringUtil;
import io.netty.util.internal.UnstableApi;

@UnstableApi
public class DefaultDnsPtrRecord extends AbstractDnsRecord implements DnsPtrRecord {

    private final String hostname;

    /**
     * Creates a new PTR record.
     *
     * @param name the domain name
     * @param dnsClass the class of the record, usually one of the following:
     *                 <ul>
     *                     <li>{@link #CLASS_IN}
     *                     <li>{@link #CLASS_CSNET}
     *                     <li>{@link #CLASS_CHAOS}
     *                     <li>{@link #CLASS_HESIOD}
     *                     <li>{@link #CLASS_NONE}
     *                     <li>{@link #CLASS_ANY}
     *                 </ul>
     * @param timeToLive the TTL value of the record
     * @param hostname the hostname this PTR record resolves to.
     */
    public DefaultDnsPtrRecord(
            String name, int dnsClass, long timeToLive, String hostname) {
        super(name, DnsRecordType.PTR, dnsClass, timeToLive);
        this.hostname = checkNotNull(hostname, "hostname");
    }

    @Override
    public String hostname() {
        return hostname;
    }

    @Override
    public String toString() {
        final StringBuilder buf = new StringBuilder(64).append(StringUtil.simpleClassName(this)).append('(');
        final DnsRecordType type = type();
        buf.append(name().isEmpty()? "<root>" : name())
           .append(' ')
           .append(timeToLive())
           .append(' ');

        DnsMessageUtil.appendRecordClass(buf, dnsClass())
                      .append(' ')
                      .append(type.name());

        buf.append(' ')
           .append(hostname);

        return buf.toString();
    }
}

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