LogWriter.java

/*
 * This file is part of FTB Launcher.
 *
 * Copyright © 2012-2016, FTB Launcher Contributors <https://github.com/Slowpoke101/FTBLaunch/>
 * FTB Launcher is 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 net.ftb.log;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class LogWriter implements ILogListener
{
	private final BufferedWriter logWriter;
	private final LogSource source;

	public LogWriter (File logFile, LogSource source) throws IOException
	{
		this.source = source;
		this.logWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(logFile), "UTF-8"));
		this.logWriter.write(logFile + ": written by FTB Launcher" + System.getProperty("line.separator"));
		this.logWriter.flush();
		Runtime.getRuntime().addShutdownHook(new Thread()
		{
			@Override
			public void run ()
			{
				try
				{
					logWriter.flush();
				}
				catch (IOException ignored)
				{
					// ignored
				}
			}
		});
	}

	@Override
	public void onLogEvent (LogEntry entry)
	{
		if (entry.source == source)
		{
			try
			{
				logWriter.write(entry.toString(LogType.EXTENDED) + System.getProperty("line.separator"));
			}
			catch (IOException e)
			{
				// We probably do not want to trigger new errors
				// How can we notify user? Is notify needed?
				// Logger.logError("Error while writing logs", e);
			}
		}
	}
}