RouteEntry.java :  » Network » adhoc-on-android » adhoc » aodv » routes » Android Open Source

package adhoc.aodv.routes;

import adhoc.aodv.Constants;
import adhoc.aodv.exception.RouteNotValidException;

public abstract class RouteEntry {
    protected int destAddress;
    protected volatile long alivetimeLeft;
    protected volatile int destSeqNum;
    protected int hopCount;
    protected final Object aliveTimeLock = new Integer(0);
    
    public RouteEntry(int hopCount, int destSeqNum, int destAddress) throws RouteNotValidException{
      if(destAddress <= Constants.MAX_VALID_NODE_ADDRESS && destAddress >= Constants.MIN_VALID_NODE_ADDRESS
            && (destSeqNum <= Constants.MAX_SEQUENCE_NUMBER 
                && destSeqNum >= Constants.FIRST_SEQUENCE_NUMBER 
                || destSeqNum == Constants.UNKNOWN_SEQUENCE_NUMBER)){
        this.hopCount = hopCount;
        this.destSeqNum = destSeqNum;
        this.destAddress = destAddress;
      } else {
        throw new RouteNotValidException("RouteEntry: invalid parameters given");
      }
    }
    
    /**
     * 
     * @return the system time of when the route becomes stale
     */
    public long getAliveTimeLeft(){
      synchronized (aliveTimeLock) {
        return alivetimeLeft;
      }
    }
    
    public abstract void resetAliveTimeLeft();
    
    public int getDestinationSequenceNumber(){
        return destSeqNum;  
    }
    
    public int getHopCount(){
      return hopCount;
    }
    
    public int getDestinationAddress() {
        return destAddress;
    }
    
}