StreamLogger.java

/*
 * This file is part of FTB Launcher.
 *
 * Copyright © 2012-2017, 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 lombok.Getter;

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

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;
    }
}