Android Open Source - MassRoute Preference Service

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Back to project page MassRoute.

License

The source code is released under:

Copyright (c) 2010 Todd Anderson http://www.custardbelly.com/blog Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (th...

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Java Source Code

package com.custardbelly.massdot.service;
//  w  ww  . j  av a 2 s  .c  o  m
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;

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

import com.custardbelly.massdot.model.MassRouteModel;
import com.custardbelly.massdot.model.StoredStopRequest;
import com.custardbelly.massdot.model.StoredStopRequests;

public class PreferenceService implements IPreferenceService 
{
  private StoredStopRequests _storedRequests;
  static private final String REQUESTS_FILE = "massroute_stop_requests";
  static private IPreferenceService _instance;
  
  private PreferenceService() {}
  
  static public IPreferenceService instance()
  {
    if( _instance == null )
      _instance = new PreferenceService();
    
    return _instance;
  }
  
  protected StoredStopRequests read( Context context )
  {
//    context.deleteFile(PreferenceService.REQUESTS_FILE);
    if( _storedRequests == null )
    {
      _storedRequests = new StoredStopRequests();
      try
      {
        FileInputStream fileInput = context.openFileInput( PreferenceService.REQUESTS_FILE );
        // Read in stored requests.
        ObjectInputStream stream = new ObjectInputStream( fileInput );
        StoredStopRequests storedRequests = (StoredStopRequests) stream.readObject();
        List<StoredStopRequest> list = storedRequests.requests;
        // Add to list.
        int i;
        for( i = 0; i < list.size(); i++ )
        {
          _storedRequests.addRequest( list.get(i) );
        }
        stream.close();
      }
      catch( Exception e )
      {
        Log.d( "PREFERENCE SERVICE", "Read stored request Exception: " + e.getMessage() );
      }
    }
    return _storedRequests;
  }
  
  protected boolean save( Context context )
  {
    boolean success = false;
    try
    {
      FileOutputStream fileOutput = context.openFileOutput( PreferenceService.REQUESTS_FILE, Context.MODE_PRIVATE );
      ObjectOutputStream stream = new ObjectOutputStream( fileOutput );
      stream.writeObject( _storedRequests );
      stream.close();
      success = true;
    }
    catch( Exception e )
    {
      Log.d( "PREFERENCE SERVICE", "Write stored request Exception: " + e.getMessage() );
    }
    return success;
  }
  
  public boolean saveStopRequest( MassRouteModel model, Context context ) 
  {
    boolean success = false;
  
    StoredStopRequest request = new StoredStopRequest();
    request.routeId = model.getSelectedRoute().getTag();
    request.routeTitle = model.getSelectedRoute().getTitle();
    request.directionId = model.getSelectedRouteDirection().getTag();
    request.directionTitle = model.getSelectedRouteDirection().getTitle();
    request.stopId = model.getSelectedRouteStop().getTag();
    request.stopTitle = model.getSelectedRouteStop().getTitle();
    
    StoredStopRequests requests = read( context );
    if( requests != null )
    {
      _storedRequests.addRequest( request );
    }
    else
    {
      _storedRequests = new StoredStopRequests();
      _storedRequests.addRequest( request );
    }
    
    success = save( context );
    if( !success )
    {
      _storedRequests.removeRequest( request );
    }
    return success;
  }
  
  public boolean removeStopRequest( StoredStopRequest request, Context context )
  {
    boolean success = false;
    StoredStopRequests requests = read( context );
    if( requests != null )
    {
      _storedRequests.removeRequest( request );
      success = save( context );
      if( !success )
      {
        _storedRequests.addRequest( request );
      }
    }
    return success;
  }
  
  public List<StoredStopRequest> getStopRequests( Context context )
  {
    StoredStopRequests storedRequests = read( context );
    return ( storedRequests != null ) ? storedRequests.requests : null;
  }
}

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