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The core module of Pcap4J.
There is a newer version: 2.0.0-alpha.6
/*_##########################################################################
  _##
  _##  Copyright (C) 2016  Pcap4J.org
  _##
  _##########################################################################
*/

package org.pcap4j.packet;

import static org.pcap4j.util.ByteArrays.*;

import java.net.Inet6Address;
import org.pcap4j.packet.DnsResourceRecord.DnsRData;
import org.pcap4j.util.ByteArrays;

/**
 * DNS AAAA RDATA
 *
 *  * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 * |                    ADDRESS                    |
 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 *
 * where:
 *
 * ADDRESS         A 64 bit Internet address.
 * 
 *
 * @see RFC 3596
 * @author Kaito Yamada
 * @since pcap4j 1.7.1
 */
public final class DnsRDataAaaa implements DnsRData {

  /** */
  private static final long serialVersionUID = 69151497541755310L;

  private final Inet6Address address;

  /**
   * A static factory method. This method validates the arguments by {@link
   * ByteArrays#validateBounds(byte[], int, int)}, which may throw exceptions undocumented here.
   *
   * @param rawData rawData
   * @param offset offset
   * @param length length
   * @return a new DnsRDataAaaa object.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static DnsRDataAaaa newInstance(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);
    return new DnsRDataAaaa(rawData, offset, length);
  }

  private DnsRDataAaaa(byte[] rawData, int offset, int length) throws IllegalRawDataException {
    if (length < INET6_ADDRESS_SIZE_IN_BYTES) {
      StringBuilder sb = new StringBuilder(200);
      sb.append("The data is too short to build a DnsRDataAaaa (")
          .append(INET6_ADDRESS_SIZE_IN_BYTES)
          .append(" bytes). data: ")
          .append(ByteArrays.toHexString(rawData, " "))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
      throw new IllegalRawDataException(sb.toString());
    }
    this.address = ByteArrays.getInet6Address(rawData, offset);
  }

  private DnsRDataAaaa(Builder builder) {
    if (builder == null || builder.address == null) {
      StringBuilder sb = new StringBuilder();
      sb.append("builder: ").append(builder).append(" builder.address: ").append(builder.address);
      throw new NullPointerException(sb.toString());
    }

    this.address = builder.address;
  }

  /** @return address */
  public Inet6Address getAddress() {
    return address;
  }

  @Override
  public int length() {
    return INET6_ADDRESS_SIZE_IN_BYTES;
  }

  @Override
  public byte[] getRawData() {
    return address.getAddress();
  }

  /** @return a new Builder object populated with this object's fields. */
  public Builder getBuilder() {
    return new Builder(this);
  }

  @Override
  public String toString() {
    return convertToString("", null);
  }

  @Override
  public String toString(String indent) {
    return convertToString(indent, null);
  }

  @Override
  public String toString(String indent, byte[] headerRawData) {
    if (headerRawData == null) {
      throw new NullPointerException("headerRawData is null.");
    }
    return convertToString(indent, headerRawData);
  }

  private String convertToString(String indent, byte[] headerRawData) {
    StringBuilder sb = new StringBuilder();
    String ls = System.getProperty("line.separator");

    sb.append(indent)
        .append("AAAA RDATA:")
        .append(ls)
        .append(indent)
        .append("  ADDRESS: ")
        .append(address.getHostAddress())
        .append(ls);

    return sb.toString();
  }

  @Override
  public int hashCode() {
    return address.hashCode();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (!this.getClass().isInstance(obj)) {
      return false;
    }
    DnsRDataAaaa other = (DnsRDataAaaa) obj;
    return address.equals(other.address);
  }

  /**
   * @author Kaito Yamada
   * @since pcap4j 1.7.1
   */
  public static final class Builder {

    private Inet6Address address;

    /** */
    public Builder() {}

    private Builder(DnsRDataAaaa obj) {
      this.address = obj.address;
    }

    /**
     * @param address address
     * @return this Builder object for method chaining.
     */
    public Builder address(Inet6Address address) {
      this.address = address;
      return this;
    }

    /** @return a new DnsRDataAaaa object. */
    public DnsRDataAaaa build() {
      return new DnsRDataAaaa(this);
    }
  }
}