StreamLogger.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.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

import lombok.Getter;

public class StreamLogger extends Thread
{
	private final BufferedReader br;
	private final LogEntry logInfo;
	private String[] ignore;

	@Getter
	private static StreamLogger instance;

	private StreamLogger (InputStream from, LogEntry logInfo)
	{
		instance = this;
		this.br = new BufferedReader(new InputStreamReader(from, Charset.forName("UTF-8")));
		this.logInfo = logInfo;
	}

	@Override
	public void run ()
	{
		String line;
		try
		{
			while ((line = br.readLine()) != null)
			{
				boolean skip = false;
				if (ignore != null)
				{
					for(String s : ignore)
					{
						if (line.contains(s))
						{
							skip = true;
						}
					}
				}
				if (!skip)
				{
					Logger.log(new LogEntry(false).copyInformation(logInfo).message(line));
				}
			}
		}
		catch (IOException e)
		{
			Logger.logError("Error while reading log messages from external source(minecraft process)", e);
		}
	}

	/**
	 * Creates StreamLogger object
	 *
	 * @param from InputStream to read incoming log
	 * @param logInfo default LogEntry configuration
	 */
	public static void prepare (InputStream from, LogEntry logInfo)
	{
		logInfo.source(LogSource.EXTERNAL);
		instance = new StreamLogger(from, logInfo);
	}

	/**
	 * Starts external process logger
	 */
	public static void doStart ()
	{
		instance.start();
	}

	/**
	 * Sets StreamLogger to stop logging certain messages. Uses String.contains() when comparing given strings to single external log line
	 *
	 * @param ignore Array containing Strings which are used to ignore lines from LogListeteners
	 */
	public static void setIgnore (String[] ignore)
	{
		instance.ignore = ignore;
	}
}