Android Open Source - tum-campus Sync Manager

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License

The source code is released under:

GNU General Public License

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Java Source Code

?package de.tum.in.tumcampus.models;
/*from  ww w. ja va 2s  .c  o  m*/
import de.tum.in.tumcampus.common.Utils;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

/**
 * Sync Manager, tracks last successful syncs
 */
public class SyncManager {

  /**
   * Database connection
   */
  private SQLiteDatabase db;

  /**
   * Constructor, open/create database, create table if necessary
   * 
   * <pre>
   * @param context Context
   * </pre>
   */
  public SyncManager(Context context) {
    db = DatabaseManager.getDb(context);

    // create table if needed
    db.execSQL("CREATE TABLE IF NOT EXISTS syncs (id VARCHAR PRIMARY KEY, lastSync VARCHAR)");
  }

  /**
   * Replace or Insert a successful sync event in the database
   * 
   * <pre>
   * @param db Database connection
   * @param obj Gives class name as sync ID
   * @throws Exception
   * </pre>
   */
  public static void replaceIntoDb(SQLiteDatabase db, Object obj) {
    replaceIntoDb(db, obj.getClass().getName());
  }

  /**
   * Replace or Insert a successful sync event in the database
   * 
   * <pre>
   * @param db Database connection
   * @param id Sync-ID (derived by originator class name)
   * </pre>
   */
  public static void replaceIntoDb(SQLiteDatabase db, String id) {
    Utils.log(id);

    if (id.length() == 0) {
      return;
    }
    db.execSQL("REPLACE INTO syncs (id, lastSync) VALUES (?, datetime())", new String[] { id });
  }

  /**
   * Checks if a new sync is needed or if data is up-to-date
   * 
   * <pre>
   * @param db Database connection
   * @param obj Gives class name as sync ID
   * @param seconds Sync period, e.g. 86400 for 1 day
   * @return true if sync is needed, else false
   * </pre>
   */
  public static boolean needSync(SQLiteDatabase db, Object obj, int seconds) {
    return needSync(db, obj.getClass().getName(), seconds);
  }

  /**
   * Checks if a new sync is needed or if data is up-to-date
   * 
   * <pre>
   * @param db Database connection
   * @param id Sync-ID (derived by originator class name)
   * @param seconds Sync period, e.g. 86400 for 1 day
   * @return true if sync is needed, else false
   * </pre>
   */
  public static boolean needSync(SQLiteDatabase db, String id, int seconds) {
    boolean result = true;
    Cursor c = db.rawQuery("SELECT lastSync FROM syncs WHERE lastSync > datetime('now', '-" + seconds
        + " second') AND id=?", new String[] { id });
    if (c.getCount() == 1) {
      result = false;
    }
    c.close();
    return result;
  }

  /**
   * Removes all items from database
   */
  public void deleteFromDb() {
    db.execSQL("DELETE FROM syncs");
  }
}

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