001    /*
002     * SonarQube, open source software quality management tool.
003     * Copyright (C) 2008-2014 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * SonarQube is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * SonarQube is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public License
017     * along with this program; if not, write to the Free Software Foundation,
018     * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019     */
020    package org.sonar.process;
021    
022    import org.apache.commons.io.FileUtils;
023    import org.apache.commons.io.IOUtils;
024    import org.apache.commons.lang.text.StrSubstitutor;
025    
026    import java.io.File;
027    import java.io.FileReader;
028    import java.util.Enumeration;
029    import java.util.Map;
030    import java.util.Properties;
031    
032    public final class ConfigurationUtils {
033    
034      private ConfigurationUtils() {
035        // Utility class
036      }
037    
038      public static Properties interpolateVariables(Properties properties, Map<String, String> variables) {
039        Properties result = new Properties();
040        Enumeration keys = properties.keys();
041        while (keys.hasMoreElements()) {
042          String key = (String) keys.nextElement();
043          String value = (String) properties.get(key);
044          String interpolatedValue = StrSubstitutor.replace(value, variables, "${env:", "}");
045          result.setProperty(key, interpolatedValue);
046        }
047        return result;
048      }
049    
050      static Props loadPropsFromCommandLineArgs(String[] args) {
051        if (args.length != 1) {
052          throw new IllegalArgumentException("Only a single command-line argument is accepted " +
053            "(absolute path to configuration file)");
054        }
055    
056        File propertyFile = new File(args[0]);
057        Properties properties = new Properties();
058        FileReader reader = null;
059        try {
060          reader = new FileReader(propertyFile);
061          properties.load(reader);
062        } catch (Exception e) {
063          throw new IllegalStateException("Could not read properties from file: " + args[0], e);
064        } finally {
065          IOUtils.closeQuietly(reader);
066          FileUtils.deleteQuietly(propertyFile);
067        }
068        return new Props(properties);
069      }
070    }