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jsync.io is a non-blocking, event-driven networking framework for Java
There is a newer version: 1.10.13
/*
 * Copyright (c) 2013 The Netty Project
 * ------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *     The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 *
 *     The Apache License v2.0 is available at
 *     http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */
package io.jsync.dns.impl.netty;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * The message super-class which contains core information concerning DNS
 * packets, both outgoing and incoming.
 */
public abstract class DnsMessage {

    private final List questions = new ArrayList();
    private final List answers = new ArrayList();
    private final List authority = new ArrayList();
    private final List additional = new ArrayList();

    private H header;

    /**
     * Returns the header belonging to this message.
     */
    public H getHeader() {
        return header;
    }

    /**
     * Sets this message's {@link DnsHeader}.
     *
     * @param header the header being attached to this message
     * @return the message to allow method chaining
     */
    public DnsMessage setHeader(H header) {
        this.header = header;
        return this;
    }

    /**
     * Returns a list of all the questions in this message.
     */
    public List getQuestions() {
        return Collections.unmodifiableList(questions);
    }

    /**
     * Returns a list of all the answer resource records in this message.
     */
    public List getAnswers() {
        return Collections.unmodifiableList(answers);
    }

    /**
     * Returns a list of all the authority resource records in this message.
     */
    public List getAuthorityResources() {
        return Collections.unmodifiableList(authority);
    }

    /**
     * Returns a list of all the additional resource records in this message.
     */
    public List getAdditionalResources() {
        return Collections.unmodifiableList(additional);
    }

    /**
     * Adds an answer resource record to this message.
     *
     * @param answer the answer resource record to be added
     * @return the message to allow method chaining
     */
    public DnsMessage addAnswer(DnsResource answer) {
        answers.add(answer);
        return this;
    }

    /**
     * Adds a question to this message.
     *
     * @param question the question to be added
     * @return the message to allow method chaining
     */
    public DnsMessage addQuestion(DnsQuestion question) {
        questions.add(question);
        return this;
    }

    /**
     * Adds an authority resource record to this message.
     *
     * @param resource the authority resource record to be added
     * @return the message to allow method chaining
     */
    public DnsMessage addAuthorityResource(DnsResource resource) {
        authority.add(resource);
        return this;
    }

    /**
     * Adds an additional resource record to this message.
     *
     * @param resource the additional resource record to be added
     * @return the message to allow method chaining
     */
    public DnsMessage addAdditionalResource(DnsResource resource) {
        additional.add(resource);
        return this;
    }

}