Bug 182680 Use feature of new Aggregation framework of Data Engine.
DataEngine will implement new aggregation framework in 2.2.0RC0. After the implementation is finished Engine should go ahead to use new column bindings in definition of map/highlight.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineLogger.java
/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.engine.api.impl;
import java.io.IOException;
import com.ibm.icu.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.FileHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;
/**
 * BIRT Logger is a logger associated with the global "org.eclipse.birt" name space. "org.eclipse.birt" is the ancestor of all of the BIRT packages.
 * According to Java 1.4 Logging mechnism, by default all Loggers also send their output to their parent Logger.
 * Thus, in any BIRT package, if developer uses Logger.getLogger( theBIRTClass.class.getName() ) to create a logger, 
 * the logger will send the logging requests to the BIRTLogger.  
 * And BIRTLogger will log the informatin into the global BIRT log file. The global log file is specified by main application.
 * If developer doesn't want the log of his module is logged into the global BIRT log file, 
 * he can simply use logger.setUseParentHandlers(false) to stop sending the logging request to the BIRTLogger.
 * <br>
 * Note: Because of a Java API's bug, an additional .lck file will be created for each log file. 
 * 		 Please see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4775533 for detail.