/**
 * Message.java
 *
 *
 * Created: Thu Sep 12 16:43:56 2002
 *
 * @author Kenneth J. Goldman
 * @version 1.0
 */

public final class Message implements java.io.Serializable {
  // Message Type options
  public static final int REGISTRATION = 0;
  public static final int WAKEUP = 1; 
  public static final int INITIATE = 2;
  public static final int TEST = 3;
  public static final int ACCEPT = 4;
  public static final int REJECT = 5;
  public static final int REPORT = 6;
  public static final int CHANGE_ROOT = 7;
  public static final int CONNECT = 8;
  public static final int INFORM = 9;
  public static final int ALL_DONE = 10;

  public static final String[] messageNames = {"registration",
					       "wakeup",
					       "initiate",
					       "test",
					       "accept",
					       "reject",
					       "report",
					       "changeRoot",
					       "connect",
					       "inform",
					       "allDone"};


  public int messageType; //one of the above constants
  public int sender;      //Node ID of sender
  public int destination; //Node ID of destination
  public int core;        //Node ID of sender's fragment core (not always used)
  public int level;       //Node ID of sender's level (not always used)
  public int cost;        //MWOE cost in sender's subtree (not always used)
  public Object serverData; // used in registration messages
  
  // Constructor for REGISTRATION messages...
  // When sent to server:
  //     destination should be 0
  //     serverData should be a String (your name)
  // When sent from server:
  //     destination will be your node's ID
  //     serverData will be a TreeMap of edge costs to node IDs,
  //        where both costs and IDs are stored as Integer objects
  public Message(int destination, Object serverData) {
    messageType = REGISTRATION;
    this.destination = destination;
    this.serverData = serverData;
  }

  // Constructor for Initiate, Test, Connect, and Inform messages:
  public Message(int messageType, int sender, int destination,
		 int core, int level) {
    this(messageType, sender, destination, core, level, 0);
  }
  
  // Constructor for Report mesages
  public Message(int messageType, int sender, int destination, int cost) {
    this(messageType, sender, destination, 0, 0, cost);
  }

  // Constructor for all other mesages
  public Message(int messageType, int sender, int destination) {
    this(messageType, sender, destination, 0, 0, 0);
  }

  // You probably won't need this constructor:
  public Message(int messageType,
		  int sender,
		  int destination,
		  int core,
		  int level,
		  int cost) {
    if (messageType < 0 || messageType > 10)
      throw new IllegalArgumentException("Bad message type: " + messageType);
    this.messageType = messageType;
    this.sender = sender;
    this.destination = destination;
    this.core = core;
    this.level = level;
    this.cost = cost;
  }

  public String toString() {
    return sender + "-->" + destination + ": " + shortString();
  }

  public String shortString() {
    String result = messageNames[messageType] + "(";
    switch (messageType) {
    case REPORT:
      result += cost; break;
    case INITIATE:
    case TEST:
    case CONNECT:
    case INFORM:
      result += core + "," + level; break;
    case REGISTRATION:
      result += serverData;
    }
    result += ")";
    return result;
  }
    
} // Message