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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 io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;

/**
 * Represents any resource record (answer, authority, or additional resource
 * records).
 */
public class DnsResource extends DnsEntry implements ByteBufHolder {

    private final int contentIndex;
    private final long ttl;
    private final ByteBuf content;

    /**
     * Constructs a resource record.
     *
     * @param name         the domain name
     * @param type         the type of record being returned
     * @param aClass       the class for this resource record
     * @param ttl          the time to live after reading
     * @param contentIndex the {@code writerIndex} at which the content appears in the
     *                     original packet
     * @param content      the data contained in this record
     */
    public DnsResource(String name, int type, int aClass, long ttl, int contentIndex, ByteBuf content) {
        super(name, type, aClass);
        this.ttl = ttl;
        this.contentIndex = contentIndex;
        this.content = content;
    }

    /**
     * Returns the time to live after reading for this resource record.
     */
    public long timeToLive() {
        return ttl;
    }

    /**
     * Returns the index at which the content of this resource record
     * appears in the original packet.
     */
    public int contentIndex() {
        return contentIndex;
    }

    /**
     * Returns the length of the content in this resource record.
     */
    public int contentLength() {
        return content.writerIndex() - content.readerIndex();
    }

    /**
     * Returns the data contained in this resource record.
     */
    @Override
    public ByteBuf content() {
        return content;
    }

    /**
     * Returns a deep copy of this resource record.
     */
    @Override
    public DnsResource copy() {
        return new DnsResource(name(), type(), dnsClass(), ttl, contentIndex, content.copy());
    }

    /**
     * Returns a duplicate of this resource record.
     */
    @Override
    public ByteBufHolder duplicate() {
        return new DnsResource(name(), type(), dnsClass(), ttl, contentIndex, content.duplicate());
    }

    @Override
    public int refCnt() {
        return content.refCnt();
    }

    @Override
    public DnsResource retain() {
        content.retain();
        return this;
    }

    @Override
    public DnsResource retain(int increment) {
        content.retain(increment);
        return this;
    }

    @Override
    public boolean release() {
        return content.release();
    }

    @Override
    public boolean release(int decrement) {
        return content.release(decrement);
    }

}