FolderDetailLoader.java :  » Sudoku » opensudoku-android » cz » romario » opensudoku » gui » Android Open Source

/* 
 * Copyright (C) 2009 Roman Masek
 * 
 * This file is part of OpenSudoku.
 * 
 * OpenSudoku is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * OpenSudoku is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with OpenSudoku.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package cz.romario.opensudoku.gui;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.content.Context;
import android.os.Handler;
import android.util.Log;
import cz.romario.opensudoku.db.SudokuDatabase;
import cz.romario.opensudoku.game.FolderInfo;

/**
 * Loads details of given folders on one single background thread. 
 * Results are published on GUI thread via {@link FolderDetailCallback} interface.
 * 
 * Please note that instance of this class has to be created on GUI thread!
 * 
 * You should explicitly call {@link #destroy()} when this object is no longer needed.
 * 
 * @author romario
 *
 */
public class FolderDetailLoader {
  
  private static final String TAG = "FolderDetailLoader";
  
  private Context mContext;
  private SudokuDatabase mDatabase;
  private Handler mGuiHandler;
  private ExecutorService mLoaderService = Executors.newSingleThreadExecutor();
  
  public FolderDetailLoader(Context context) {
    mContext = context;
    mDatabase = new SudokuDatabase(mContext);
    mGuiHandler = new Handler();
  }
  
  public void loadDetailAsync(long folderID, FolderDetailCallback loadedCallback) {
    final long folderIDFinal = folderID;
    final FolderDetailCallback loadedCallbackFinal = loadedCallback;
    mLoaderService.execute(new Runnable() {
      @Override
      public void run() {
        try {
        final FolderInfo folderInfo = mDatabase.getFolderInfoFull(folderIDFinal);
        
        mGuiHandler.post(new Runnable() {
          @Override
          public void run() {
            loadedCallbackFinal.onLoaded(folderInfo);
          }
        });
        } catch (Exception e) {
          // this is some unimportant background stuff, do not fail
          Log.e(TAG, "Error occured while loading full folder info.", e);
        }
      }
    });
  }
  
  public void destroy() {
    mLoaderService.shutdownNow();
    mDatabase.close();
  }
  
  public interface FolderDetailCallback {
    void onLoaded(FolderInfo folderInfo);
  }
}