package com.atlassian.plugin.spring.scanner.core.vfs;
   
   import java.io.File;
   import java.io.FileNotFoundException;
   import java.io.FileReader;
   import java.io.FileWriter;
   import java.io.IOException;
   import java.util.Collection;
   import java.util.Collections;
  import java.util.Properties;
  
  /**
   */
  class FileBasedVirtualFile implements VirtualFile {
      private final File file;
  
      FileBasedVirtualFile(final File file) {
          this.file = file;
      }
  
      @Override
      public Collection<String> readLines() throws IOException {
          FileReader reader;
          try {
              reader = new FileReader(file);
          } catch (FileNotFoundException e) {
              return Collections.emptyList();
          }
          return CommonIO.readLines(reader);
      }
  
      @Override
      public void writeLines(final Iterable<String> lines) throws IOException {
          mkdirs(file);
          CommonIO.writeLines(new FileWriter(file), lines);
      }
  
      @Override
      public void writeProperties(final Properties properties, final String comment) throws IOException {
          mkdirs(file);
          CommonIO.writeProperties(new FileWriter(file), properties, comment);
      }
  
      private void mkdirs(final File file) throws IOException {
          File parentDir = file.getParentFile();
          //noinspection ResultOfMethodCallIgnored
          parentDir.mkdirs();
          if (!parentDir.exists()) {
              throw new IOException("Unable to create output directory " + parentDir);
          }
      }
  }