Log.java

/* 
 * Copyright 2010-2013 Eric Kok et al.
 * 
 * Transdroid 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.
 * 
 * Transdroid 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 Transdroid.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.transdroid.core.gui.log;

import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.stmt.DeleteBuilder;

import org.androidannotations.annotations.EBean;
import org.androidannotations.annotations.EBean.Scope;
import org.androidannotations.annotations.OrmLiteDao;
import org.transdroid.BuildConfig;

import java.util.Date;

/**
 * Application-wide logging class that registers entries in the database (for a certain time).
 * @author Eric Kok
 */
@EBean(scope = Scope.Singleton)
public class Log {

	public static final String LOG_NAME = "Transdroid";
	private static final long MAX_LOG_AGE = 15 * 60 * 1000; // 15 minutes
	@OrmLiteDao(helper = DatabaseHelper.class, model = ErrorLogEntry.class)
	Dao<ErrorLogEntry, Integer> errorLogDao;

	protected void log(Object object, int priority, String message) {
		log(object instanceof String ? (String) object : object.getClass().getSimpleName(), priority, message);
	}

	protected void log(String logName, int priority, String message) {
		if (BuildConfig.DEBUG) {
			android.util.Log.println(priority, LOG_NAME, message);
		}
		try {
			// Store this log message to the database
			errorLogDao.create(new ErrorLogEntry(priority, logName, message));
			// Truncate the error log
			DeleteBuilder<ErrorLogEntry, Integer> db = errorLogDao.deleteBuilder();
			db.setWhere(db.where().le(ErrorLogEntry.DATEANDTIME, new Date(new Date().getTime() - MAX_LOG_AGE)));
			errorLogDao.delete(db.prepare());
		} catch (Exception e) {
			android.util.Log.e(LOG_NAME, "Cannot write log message to database: " + e.toString());
		}
	}

	public void d(Object object, String msg) {
		log(object, android.util.Log.DEBUG, msg);
	}

	public void i(Object object, String msg) {
		log(object, android.util.Log.DEBUG, msg);
	}

	public void e(Object object, String msg) {
		log(object, android.util.Log.ERROR, msg);
	}

}