package com.atlassian.refapp.sal;
   
   import com.atlassian.fugue.Pair;
   import com.atlassian.sal.api.ApplicationProperties;
   import org.apache.commons.io.IOUtils;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  
  public class FileBackedSettingsFileFactory {
      private static Logger log = LoggerFactory.getLogger(FileBackedSettingsFileFactory.class);
  
      public static Pair<File, Properties> getFileAndProperties(String fileStorageProperty, String defaultFileName, boolean useMemoryStore, ApplicationProperties applicationProperties) {
          File file = new File(System.getProperty(fileStorageProperty, defaultFileName));
          Properties properties = new Properties();
          if (useMemoryStore) {
              log.info("Using memory store for settings");
              file = null;
          } else if (!file.exists() || !file.canRead()) {
              // Use refapp home directory
              File dataDir = new File(applicationProperties.getHomeDirectory(), "data");
              try {
                  if (!dataDir.exists()) {
                      dataDir.mkdirs();
                  }
                  file = new File(dataDir, defaultFileName);
                  file.createNewFile();
              } catch (IOException ioe) {
                  log.warn("Error creating settings properties, using memory store", ioe);
                  file = null;
              }
          }
          if (file != null && file.length() > 0) {
              file = load(file, properties);
          }
          if (file != null) {
              // File is a new file
              log.info("Using " + file.getAbsolutePath() + " as settings store");
          }
          return Pair.pair(file, properties);
      }
  
      private static File load(File file, Properties properties) {
          InputStream is = null;
          try {
              is = new FileInputStream(file);
              properties.loadFromXML(is);
          } catch (Exception e) {
              log.error("Error loading settings properties, using memory store", e);
              IOUtils.closeQuietly(is);
              return null;
          }
          return file;
      }
  }