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Packet Codec
There is a newer version: 1.5.1
/** This code is licenced under the GPL version 2. */
package pcap.codec.tcp;

import java.io.Serializable;
import pcap.common.annotation.Inclubating;

/** @author Ardika Rommy Sanjaya */
@Inclubating
public final class TcpFlags implements Serializable {

  private static final long serialVersionUID = -4085108976335127778L;

  private final boolean ns;
  private final boolean cwr;
  private final boolean ece;
  private final boolean urg;
  private final boolean ack;
  private final boolean psh;
  private final boolean rst;
  private final boolean syn;
  private final boolean fin;

  private TcpFlags(final Builder builder) {
    this.ns = builder.ns;
    this.cwr = builder.cwr;
    this.ece = builder.ece;
    this.urg = builder.urg;
    this.ack = builder.ack;
    this.psh = builder.psh;
    this.rst = builder.rst;
    this.syn = builder.syn;
    this.fin = builder.fin;
  }

  public boolean isNs() {
    return ns;
  }

  public boolean isCwr() {
    return cwr;
  }

  public boolean isEce() {
    return ece;
  }

  public boolean isUrg() {
    return urg;
  }

  public boolean isAck() {
    return ack;
  }

  public boolean isPsh() {
    return psh;
  }

  public boolean isRst() {
    return rst;
  }

  public boolean isSyn() {
    return syn;
  }

  public boolean isFin() {
    return fin;
  }

  public short value() {
    short flags = 0;
    if (this.ns) {
      flags += 256;
    }
    if (this.cwr) {
      flags += 128;
    }
    if (this.ece) {
      flags += 64;
    }
    if (this.urg) {
      flags += 32;
    }
    if (this.ack) {
      flags += 16;
    }
    if (this.psh) {
      flags += 8;
    }
    if (this.rst) {
      flags += 4;
    }
    if (this.syn) {
      flags += 2;
    }
    if (this.fin) {
      flags += 1;
    }
    return flags;
  }

  @Override
  public String toString() {
    return new StringBuilder("TcpFlags{")
        .append("ns=")
        .append(isNs())
        .append(", cwr=")
        .append(isCwr())
        .append(", ece=")
        .append(isEce())
        .append(", urg=")
        .append(isUrg())
        .append(", ack=")
        .append(isAck())
        .append(", psh=")
        .append(isPsh())
        .append(", rst=")
        .append(isRst())
        .append(", syn=")
        .append(isSyn())
        .append(", fin=")
        .append(isFin())
        .append('}')
        .toString();
  }

  public static final class Builder implements pcap.common.util.Builder {

    private boolean ns;
    private boolean cwr;
    private boolean ece;
    private boolean urg;
    private boolean ack;
    private boolean psh;
    private boolean rst;
    private boolean syn;
    private boolean fin;

    public Builder ns(boolean ns) {
      this.ns = ns;
      return this;
    }

    public Builder cwr(boolean cwr) {
      this.cwr = cwr;
      return this;
    }

    public Builder ece(boolean ece) {
      this.ece = ece;
      return this;
    }

    public Builder urg(boolean urg) {
      this.urg = urg;
      return this;
    }

    public Builder ack(boolean ack) {
      this.ack = ack;
      return this;
    }

    public Builder psh(boolean psh) {
      this.psh = psh;
      return this;
    }

    public Builder rst(boolean rst) {
      this.rst = rst;
      return this;
    }

    public Builder syn(boolean syn) {
      this.syn = syn;
      return this;
    }

    public Builder fin(boolean fin) {
      this.fin = false;
      return this;
    }

    @Override
    public TcpFlags build() {
      return new TcpFlags(this);
    }

    @Override
    public TcpFlags build(Short flags) {
      this.fin = ((flags >> 0) & 0x1) == 1;
      this.syn = ((flags >> 1) & 0x1) == 1;
      this.rst = ((flags >> 2) & 0x1) == 1;
      this.psh = ((flags >> 3) & 0x1) == 1;
      this.ack = ((flags >> 4) & 0x1) == 1;
      this.urg = ((flags >> 5) & 0x1) == 1;
      this.ece = ((flags >> 6) & 0x1) == 1;
      this.cwr = ((flags >> 7) & 0x1) == 1;
      this.ns = ((flags >> 8) & 0x1) == 1;
      return new TcpFlags(this);
    }
  }
}