Android Open Source - cost-tracker Persistent Tracker Manager

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.helpguest.droid.tracker;
/*w w w.j  a v  a2 s. c  o  m*/
import java.io.File;
import java.io.IOException;
import java.util.Collection;

import android.content.Context;
import android.content.ContextWrapper;
import android.content.SharedPreferences;
import android.util.Log;

import com.helpguest.droid.tracker.io.ITrackerReader;
import com.helpguest.droid.tracker.io.ITrackerWriter;
import com.helpguest.droid.tracker.io.TrackerFileReader;
import com.helpguest.droid.tracker.io.TrackerFileWriter;

/**
 * Utility methods to manage the Trackers. This utility will
 * provide an interface to the user to manage how, when and where
 * trackers are persisted so that clients don't have to deal with
 * those issues.
 * 
 * @author mabrams
 *
 */
public class PersistentTrackerManager extends InMemoryTrackerManager {

  private SharedPreferences sharedPrefs;
  private Context applicationContext;
  
  public PersistentTrackerManager(Context appContext, SharedPreferences sharedPreferences) {
    super(appContext);
    applicationContext = appContext;
    this.sharedPrefs = sharedPreferences;
    validateDataStore();
    loadTrackers();
  }
  
  private void loadTrackers() {
    ITrackerReader tReader = new TrackerFileReader(applicationContext, sharedPrefs);
    Collection<ITracker> trackers = tReader.getTrackers();
    add(trackers);
  }
    
  private void validateDataStore() {
    ContextWrapper cWrapper = new ContextWrapper(applicationContext);
    boolean exists = false;
    for (String file : cWrapper.fileList()) {
      if (file.equals(TrackerFileWriter.TRACKER_DATA_V1)) {
        exists = true;
        break;
      }
    }

    if (!exists) {
      File dataStoreFile = new File(applicationContext.getFilesDir(), TrackerFileWriter.TRACKER_DATA_V1);      
      try {
        dataStoreFile.createNewFile();
      } catch (IOException e) {
        Log.d(PersistentTrackerManager.class.toString(), "IOException attempting to create the data store: " + e.getMessage());
      }
    }
  }

  public void persistTrackers() {
    ITrackerWriter tWriter = new TrackerFileWriter(applicationContext, sharedPrefs);
    tWriter.write(getTrackers());
  }


}

Java Source Code List