Android Open Source - salaya-tram-map Tram Car Schedule

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License

The source code is released under:

Unless otherwise noted, this software is Copyright 2011 Pawit Pornkitprasan and is licensed under the Simplified BSD License. Copyright 2011 Pawit Pornkitprasan. All rights reserved. Red...

Java Source Code

package org.dyndns.pawitp.salayatrammap.schedule;
/*  w  w  w .j  a va 2 s.  co m*/
import android.text.format.Time;
import android.util.Log;

public class TramCarSchedule {
  
  private static final String TAG = "TramCarSchedule";
  
  private static final long TRAM_ROUND_TIME = 600000; // 10 minutes
  private static final int NO_MORE_TRAM = -1;
  
  private Integer[][] mSchedule;
  private int mNextTram; // cache, always update before use
  
  public TramCarSchedule() { }
  
  public void updateSchedule(Integer[][] schedule) {
    mSchedule = schedule;
    
    updateNextTram();
  }
  
  public Time getLastTram() throws NoTramLeftException, NoMoreTramException {
    try {
      int index = locateNextTram() - 1;
      
      if (index < 0) {
        throw new NoTramLeftException();
      }
      
      return tramTimeToTime(mSchedule[index]);
    }
    catch (NoMoreTramException e) {
      // Check if the last round of tram is still running
      int indexLast = mSchedule.length - 1;
      Time last = tramTimeToTime(mSchedule[indexLast]);
      Time now = new Time();
      now.setToNow();
      
      long diff = now.toMillis(false) - last.toMillis(false);
      if (diff < TRAM_ROUND_TIME) {
        return last;
      }
      else {
        throw new NoMoreTramException();
      }
    }
  }
  
  public Time getNextTram() throws NoMoreTramException {
    return tramTimeToTime(mSchedule[locateNextTram()]);
  }
  
  public long getUpdateTime() {
    Time now = new Time();
    now.setToNow();
    
    try {
      Time tram = tramTimeToTime(mSchedule[locateNextTram()]); 
      return tram.toMillis(false) - now.toMillis(false);
    }
    catch (NoMoreTramException e) {
      // Check last round
      int indexLast = mSchedule.length - 1;
      Time last = tramTimeToTime(mSchedule[indexLast]);
      
      long timeDiff = now.toMillis(false) - last.toMillis(false);
      if (timeDiff < TRAM_ROUND_TIME) {
        return TRAM_ROUND_TIME  - timeDiff;
      }
      else {
        // wait till next day
        Time tomorrow = new Time();
        tomorrow.setToNow();
        tomorrow.hour = 24;
        tomorrow.minute = 0;
        tomorrow.second = 0;
        
        return tomorrow.toMillis(false) - now.toMillis(false);
      }
    }
  }
  
  // Call before using any of my functions!
  // (normally called by updateSchedule)
  public void updateNextTram() {
    Log.v(TAG, "Calculating next tram");
    Time now = new Time();
    now.setToNow();
    now.second = 0; // Avoid second differences in comparison
    
    Time tram = new Time(now);
    
    boolean found = false;
    int len = mSchedule.length;
    int i;
    for (i = 0; i < len; i++) {
      tram.hour = mSchedule[i][0];
      tram.minute = mSchedule[i][1];
      
      if (tram.after(now)) {
        Log.v(TAG, "Found tram: " + i);
        found = true;
        break;
      }
    }
    
    if (found) {
      mNextTram = i;
    }
    else {
      mNextTram = NO_MORE_TRAM;
    }
  }
  
  private int locateNextTram() throws NoMoreTramException {
    if (mNextTram == NO_MORE_TRAM) {
      throw new NoMoreTramException();
    }
    
    return mNextTram;
  }
  
  private Time tramTimeToTime(Integer[] time) {
    Time ret = new Time();
    ret.setToNow();
    ret.hour = time[0];
    ret.minute = time[1];
    ret.second = 0;
    return ret;
  }
}

Java Source Code List

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