Java tutorial
/** * Copyright (C) 2010-2013 Barcelona Supercomputing Center * * This library is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 2.1 of the License, or (at your option) * any later version. This library 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 Lesser * General Public License for more details. You should have received a copy of * the GNU Lesser General Public License along with this library; if not, write * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA * 02111-1307 USA */ package eu.optimis.ip.gui.client.resources; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import org.apache.commons.configuration.ConfigurationException; import org.apache.commons.configuration.PropertiesConfiguration; import org.apache.log4j.Logger; /** * * @author jsubirat */ public class ConfigManager { private static Logger log = Logger.getLogger(ConfigManager.class); private static String optimis_Home = System.getenv("OPTIMIS_HOME"); public static final String IPMANAGER_CONFIG_FILE = "/etc/IPManagerWeb/config.properties"; public static final String DATABASE_CONFIG_FILE = "/etc/IPManagerWeb/database/database.properties"; public static final String LOG4J_CONFIG_FILE = "/etc/IPManagerWeb/log4jIPMW.properties"; public static final String COMPONENT_CONFIGURATION_FOLDER = "/etc"; public static final String COMPONENT_LOGGING_FOLDER = "/var/log"; public static PropertiesConfiguration getPropertiesConfiguration(String configFile) { String filePath = null; PropertiesConfiguration config = null; try { filePath = getFilePath(configFile); config = new PropertiesConfiguration(filePath); } catch (ConfigurationException ex) { log.error("Error reading " + filePath + " configuration file: " + ex.getMessage()); log.error(ex.getMessage()); } return config; } public static String getFilePath(String configFile) { String optimisHome = optimis_Home; if (optimisHome == null) { optimis_Home = System.getenv("OPTIMIS_HOME"); optimisHome = "/opt/optimis"; log.warn("Please set environment variable OPTIMIS_HOME. Using default /opt/optimis."); } File fileObject = new File(optimisHome.concat(configFile)); if (!fileObject.exists()) { try { createDefaultConfigFile(fileObject); } catch (Exception ex) { log.error("Error reading " + optimisHome.concat(configFile) + " configuration file: " + ex.getMessage()); log.error(ex.getMessage()); } } return optimisHome.concat(configFile); } private static void createDefaultConfigFile(File fileObject) throws Exception { log.debug("File " + fileObject.getAbsolutePath() + " didn't exist. Creating one with default values..."); //Create parent directories. log.debug("Creating parent directories."); new File(fileObject.getParent()).mkdirs(); //Create an empty file to copy the contents of the default file. log.debug("Creating empty file."); new File(fileObject.getAbsolutePath()).createNewFile(); //Copy file. log.debug("Copying file " + fileObject.getName()); InputStream streamIn = ConfigManager.class.getResourceAsStream("/" + fileObject.getName()); FileOutputStream streamOut = new FileOutputStream(fileObject.getAbsolutePath()); byte[] buf = new byte[8192]; while (true) { int length = streamIn.read(buf); if (length < 0) { break; } streamOut.write(buf, 0, length); } //Close streams after copying. try { streamIn.close(); } catch (IOException ex) { log.error("Couldn't close input stream"); log.error(ex.getMessage()); } try { streamOut.close(); } catch (IOException ex) { log.error("Couldn't close file output stream"); log.error(ex.getMessage()); } } }