Java tutorial
/* ==================================================================== * * Copyright (C) 2007 - 2015 GeoSolutions S.A.S. * http://www.geo-solutions.it * * GPLv3 + Classpath exception * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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. * * You should have received a copy of the GNU General Public License * along with this program. * * ==================================================================== * * This software consists of voluntary contributions made by developers * of GeoSolutions. For more information on GeoSolutions, please see * <http://www.geo-solutions.it/>. * */ package it.geosolutions.geostore.services.rest.auditing; import org.apache.commons.io.FileUtils; import org.apache.log4j.Logger; import java.io.File; import java.io.FileInputStream; import java.util.Properties; final class AuditingConfiguration { private static final Logger LOGGER = Logger.getLogger(AuditingConfiguration.class); static final String CONFIGURATION_PATH = "GEOSTORE_AUDITING_CONF"; static final String AUDIT_ENABLE = "auditing.enable"; static final String TEMPLATES_DIRECTORY = "auditing.templates.directory"; static final String OUTPUT_DIRECTORY = "auditing.output.directory"; static final String TEMPLATES_VERSION = "auditing.templates.version"; static final String MAX_RESQUEST_PER_FILE = "auditing.max.requests.per.file"; static final String OUTPUT_FILES_EXTENSION = "auditing.output.files.extension"; private final File configurationFile; private final long configurationFileChecksum; private final boolean auditEnable; private final String templatesDirectory; private final String outputDirectory; private final int templatesVersion; private final int maxRequestPerFile; private final String outputFilesExtension; AuditingConfiguration() { this(null, 0l); } AuditingConfiguration(File configurationFile, long configurationFileChecksum) { if (configurationFile == null) { this.configurationFile = findConfigurationFile(); this.configurationFileChecksum = checksum(this.configurationFile); } else { this.configurationFile = configurationFile; this.configurationFileChecksum = configurationFileChecksum; } Properties properties = readProperties(); auditEnable = Boolean.parseBoolean(getProperty(properties, AUDIT_ENABLE)); templatesDirectory = getProperty(properties, TEMPLATES_DIRECTORY); outputDirectory = getProperty(properties, OUTPUT_DIRECTORY); templatesVersion = Integer.parseInt(getProperty(properties, TEMPLATES_VERSION)); maxRequestPerFile = Integer.parseInt(getProperty(properties, MAX_RESQUEST_PER_FILE)); outputFilesExtension = getProperty(properties, OUTPUT_FILES_EXTENSION); } static boolean configurationExists() { return findConfigurationFile() != null; } boolean isAuditEnable() { return auditEnable; } String getTemplatesDirectory() { return templatesDirectory; } String getOutputDirectory() { return outputDirectory; } int getTemplatesVersion() { return templatesVersion; } int getMaxRequestPerFile() { return maxRequestPerFile; } String getOutputFilesExtension() { return outputFilesExtension; } AuditingConfiguration checkForNewConfiguration() { File candidateConfigurationFile = findConfigurationFile(); long candidateConfigurationFileChecksum = checksum(candidateConfigurationFile); if (configurationFile.compareTo(candidateConfigurationFile) != 0 || configurationFileChecksum != candidateConfigurationFileChecksum) { return new AuditingConfiguration(candidateConfigurationFile, candidateConfigurationFileChecksum); } return null; } private long checksum(File file) { try { return FileUtils.checksumCRC32(file); } catch (Exception exception) { throw new AuditingException(exception, "Error computing checksum of file '%s'.", file.getPath()); } } private static File findConfigurationFile() { String configurationFilePath = System.getProperty(CONFIGURATION_PATH); if (configurationFilePath == null) { configurationFilePath = System.getenv(CONFIGURATION_PATH); } if (configurationFilePath == null) { LOGGER.warn("Could not found configuration path property."); return null; } File configurationFile = new File(configurationFilePath); if (!configurationFile.exists()) { throw new AuditingException("Configuration file '%s' does not exists.", configurationFile.getPath()); } return configurationFile; } private Properties readProperties() { try { FileInputStream input = new FileInputStream(configurationFile); Properties properties = new Properties(); properties.load(input); input.close(); return properties; } catch (Exception exception) { throw new AuditingException(exception, "Error reading properties from configuration file '%s'.", configurationFile.getPath()); } } private static String getProperty(Properties properties, String propertyName) { String propertyValue = properties.getProperty(propertyName); if (propertyValue == null) { throw new AuditingException("Missing configuration property '%s'.", propertyName); } return propertyValue; } }