/***********************************************************************
 * 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.chart.internal.log;

import org.eclipse.birt.chart.engine.i18n.Messages;
import org.eclipse.birt.chart.log.ILogger;

import com.ibm.icu.util.ULocale;

/**
 * A default implementation for the chart logging framework
 */
public final class DefaultLoggerImpl implements ILogger
{

	/**
	 * A singleton instance maintained internally.
	 */
	private static DefaultLoggerImpl dli = null;

	/**
	 * The verbose level associated with logging messages.
	 */
	private int iVerboseLevel = ILogger.ERROR
			| ILogger.WARNING
			| ILogger.FATAL
			| ILogger.INFORMATION;

	/**
	 * Returns a singleton instance of the logger.
	 * 
	 * @return A singleton instance of the logger.
	 */
	public synchronized static final ILogger instance( )
	{
		if ( dli == null )
		{
			dli = new DefaultLoggerImpl( );
		}
		return dli;
	}

	/**
	 * Cannot be instantiated externally
	 */
	private DefaultLoggerImpl( )
	{
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.log.ILogger#setVerboseLevel(int)
	 */
	public final void setVerboseLevel( int iVerboseLevel )
	{
		this.iVerboseLevel = iVerboseLevel;
	}

	/**
	 * @deprecated
	 * Logs messages originating from scripts associated with a chart model.
	 * 
	 * @param sMessage
	 *            The informational message to be logged.
	 */
	public final void logFromScript( String sMessage )
	{
		if ( ( iVerboseLevel & ILogger.INFORMATION ) == ILogger.INFORMATION )
		{
			System.out.println( Messages.getString( "info.log.script", new Object[]{sMessage}, ULocale.getDefault( ) ) ); //$NON-NLS-1$
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.log.ILogger#log(int, java.lang.String)
	 */
	public void log( int iCode, String sMessage )
	{
		if ( iCode == ILogger.INFORMATION
				&& ( iVerboseLevel & ILogger.INFORMATION ) == ILogger.INFORMATION )
		{
			System.out.println( Messages.getString( "info.log.info", new Object[]{sMessage}, ULocale.getDefault( ) ) ); //$NON-NLS-1$ 
		}
		else if ( iCode == ILogger.WARNING
				&& ( iVerboseLevel & ILogger.WARNING ) == ILogger.WARNING )
		{
			System.out.println( Messages.getString( "info.log.warn", new Object[]{sMessage}, ULocale.getDefault( ) ) ); //$NON-NLS-1$
		}
		else if ( iCode == ILogger.ERROR
				&& ( iVerboseLevel & ILogger.ERROR ) == ILogger.ERROR )
		{
			System.err.println( Messages.getString( "info.log.err", new Object[]{sMessage}, ULocale.getDefault( ) ) ); //$NON-NLS-1$
		}
		else if ( iCode == ILogger.FATAL
				&& ( iVerboseLevel & ILogger.FATAL ) == ILogger.FATAL )
		{
			System.err.println( Messages.getString( "info.log.fatal", new Object[]{sMessage}, ULocale.getDefault( ) ) ); //$NON-NLS-1$
			System.exit( 0 );
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.log.ILogger#log(int, java.lang.Exception)
	 */
	public void log( Exception ex )
	{
		System.err.println( Messages.getString( "info.log.err", new Object[]{ex.toString( )}, ULocale.getDefault( ) ) ); //$NON-NLS-1$
		ex.printStackTrace( );
	}

}