Android Open Source - lightbox-android-webservices Data

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright (c) 2012 Lightbox//from  w w  w  . j  a v  a  2s . c o  m
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lightbox.android.data;

import java.sql.SQLException;

import android.content.Context;

import com.j256.ormlite.android.apptools.OpenHelperManager;
import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.table.TableUtils;
import com.lightbox.android.tasks.BackgroundTask;

/** 
 * Helper methods related to local data. 
 * @author Fabien Devos
 */
public class Data {
  /** Used to tag logs */
  @SuppressWarnings("unused")
  private static final String TAG = "Data";
  
  private static OrmLiteSqliteOpenHelper sDatabaseHelper = null;
    
    //------------------------------------------------------
    // Private constructor for utility class
    private Data() {
        throw new UnsupportedOperationException("Sorry, you cannot instantiate an utility class!");
    }
    //------------------------------------------------------

    //----------------------------------------------
  // Database Helpers
  
  /**
   * Only call this method once, from the onCreate of the Application object.
   * @param context
   */
  public static void init(Context context) {
    OpenHelperManager.setOpenHelperClass(DatabaseHelper.class);

    sDatabaseHelper = OpenHelperManager.getHelper(context, DatabaseHelper.class);
    
    // Enable least-recently-used cache TODO doesn't seams to work properly ("status" doesn't seams to be updated
    // inside the memory cache): check why.
//    for (Class<?> dataClass : DatabaseHelper.DATA_CLASSES) {
//      try {
//        getDao(dataClass).setObjectCache(new LruObjectCache(ApiCache.MAX_ENTRIES_IN_MEMORY));
//      } catch (SQLException e) {
//        Log.w(TAG, e);
//      }
//    }
  }
  
  /**
   * Deletes all records in a table
   * @param dataClass Class representing the table to clear
   */
  public static int clearTable(Class<?> dataClass) throws SQLException {
    if (sDatabaseHelper == null) { throw new IllegalStateException("You must call Data.init() before accessing clearTable"); }
    
    return TableUtils.clearTable(sDatabaseHelper.getConnectionSource(), dataClass);
  }

  /**
   * Only call this method if you are absolutely sure that you won't use the database anymore.
   */
  public static void release() {
    OpenHelperManager.releaseHelper();
  }
  
  public static <T> Dao<T, String> getDao(Class<T> dataClass) throws SQLException {
    if (sDatabaseHelper == null) { throw new IllegalStateException("You must call Data.init() before accessing Daos."); }
    
    return sDatabaseHelper.getDao(dataClass);
  }
    
  //----------------------------------------------
  // Database cleanup
  
  public static void startDatabaseCleanup() {
    BackgroundTask<Void> cleanupTask = new DatabaseCleanerTask();
    cleanupTask.execute();
  }

}

Java Source Code List