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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;

import java.util.HashMap;
import java.util.Map;
import pcap.common.annotation.Inclubating;
import pcap.common.memory.Memory;
import pcap.common.util.NamedNumber;

/** @author Ardika Rommy Sanjaya */
@Inclubating
public final class ApplicationLayer extends NamedNumber {

  private static final Map REGISTRY = new HashMap<>();

  private static final Map BUILDER = new HashMap<>();

  public ApplicationLayer(Short value, String name) {
    super(value, name);
  }

  public Packet newInstance(Memory buffer) {
    AbstractPacket.Builder packetBuilder = BUILDER.get(this.value());
    if (packetBuilder == null) {
      if (buffer == null || buffer.capacity() <= 0) {
        return null;
      }
      return new UnknownPacket.Builder().build(buffer);
    }
    return packetBuilder.build(buffer);
  }

  public static ApplicationLayer valueOf(short value) {
    for (Map.Entry entry : REGISTRY.entrySet()) {
      if (entry.getValue() == value) {
        return entry.getKey();
      }
    }
    return new ApplicationLayer((short) -1, "Unknown");
  }

  /**
   * @param applicationLayer application type.
   * @param packetBuilder packet builder.
   */
  public static synchronized void register(
      ApplicationLayer applicationLayer, AbstractPacket.Builder packetBuilder) {
    BUILDER.put(applicationLayer.value(), packetBuilder);
    REGISTRY.put(applicationLayer, applicationLayer.value());
  }
}