/** * Copyright (C) 2007 - 2016 52°North Initiative for Geospatial Open Source * Software GmbH * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * If the program is linked with libraries which are licensed under one of * the following licenses, the combination of the program with the linked * library is not considered a "derivative work" of the program: * * • Apache License, version 2.0 * • Apache Software License, version 1.0 * • GNU Lesser General Public License, version 3 * • Mozilla Public License, versions 1.0, 1.1 and 2.0 * • Common Development and Distribution License (CDDL), version 1.0 * * Therefore the distribution of the program linked with libraries licensed * under the aforementioned licenses, is permitted by the copyright holders * if the distribution is compliant with both the GNU General Public * License version 2 and the aforementioned licenses. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. */ package org.n52.wps.server.grass.util; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * This class handles Java process streams. If this would not be done, the thread would not wait * for the process to be finished. * (See http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=4) * * @author Benjamin Pross(bpross-52n) * */ public class JavaProcessStreamReader extends Thread { private static Logger LOGGER = LoggerFactory .getLogger(JavaProcessStreamReader.class); InputStream inputStream; String type; OutputStream outputStream; public JavaProcessStreamReader(InputStream is, String type) { this(is, type, null); } public JavaProcessStreamReader(InputStream is, String type, OutputStream redirect) { this.inputStream = is; this.type = type; this.outputStream = redirect; } public void run() { InputStreamReader inputStreamReader = null; PrintWriter printWriter = null; BufferedReader bufferedReader = null; try { if (outputStream != null) printWriter = new PrintWriter(outputStream); inputStreamReader = new InputStreamReader(inputStream); bufferedReader = new BufferedReader(inputStreamReader); String line = null; while ((line = bufferedReader.readLine()) != null) { if (printWriter != null) { printWriter.println(line); } else { LOGGER.debug(type + ">" + line); } } if (printWriter != null) { printWriter.flush(); } } catch (IOException ioe) { LOGGER.error("Something went wrong while parsing the Java process stream.", ioe); } finally { try { if (printWriter != null) { printWriter.close(); } if (inputStream != null) { inputStream.close(); } if (inputStreamReader != null) { inputStreamReader.close(); } if (bufferedReader != null) { bufferedReader.close(); } } catch (Exception e) { LOGGER.error( "Something went wrong while trying to close the streams.", e); } } } }