package org.codehaus.plexus.archiver;
   
   import java.io.BufferedReader;
   import java.io.File;
   import java.io.IOException;
   import java.nio.charset.StandardCharsets;
   import java.nio.file.Files;
   import java.util.Collections;
   import java.util.List;
  
  import org.codehaus.plexus.archiver.util.DefaultFileSet;
  import org.codehaus.plexus.util.FileUtils;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * An {@link ArchiveFinalizer} that process dot files with archiver directives
   * contained within. This basically means you can communicate archive creation
   * instructions between processes using dot files.
   *
   * @author Jason van Zyl
   */
  public class DotDirectiveArchiveFinalizer extends AbstractArchiveFinalizer {
  
      private static final String DEFAULT_DOT_FILE_PREFIX = ".plxarc";
  
      private final File dotFileDirectory;
  
      private final String dotFilePrefix;
  
      public DotDirectiveArchiveFinalizer(File dotFileDirectory) {
          this(dotFileDirectory, DEFAULT_DOT_FILE_PREFIX);
      }
  
      public DotDirectiveArchiveFinalizer(File dotFileDirectory, String dotFilePrefix) {
          this.dotFileDirectory = dotFileDirectory;
  
          this.dotFilePrefix = dotFilePrefix;
      }
  
      @Override
      public void finalizeArchiveCreation(Archiver archiver) throws ArchiverException {
          try {
              List<File> dotFiles = FileUtils.getFiles(dotFileDirectory, dotFilePrefix + "*", null);
  
              for (File dotFile : dotFiles) {
                  try (BufferedReader in = Files.newBufferedReader(dotFile.toPath(), StandardCharsets.UTF_8)) {
  
                      for (String line = in.readLine(); line != null; line = in.readLine()) {
                          String[] s = StringUtils.split(line, ":");
  
                          if (s.length == 1) {
                              File directory = new File(dotFileDirectory, s[0]);
  
                              System.out.println("adding directory = " + directory);
  
                              archiver.addFileSet(new DefaultFileSet(directory));
                          } else {
                              File directory = new File(dotFileDirectory, s[0]);
  
                              System.out.println("adding directory = " + directory + " to: " + s[1]);
  
                              if (s[1].endsWith("/")) {
  
                                  archiver.addFileSet(new DefaultFileSet(directory).prefixed(s[1]));
                              } else {
                                  archiver.addFileSet(new DefaultFileSet(directory).prefixed(s[1] + "/"));
                              }
                          }
                      }
                  }
              }
          } catch (IOException e) {
              throw new ArchiverException("Error processing dot files.", e);
          }
      }
  
      @Override
      public List getVirtualFiles() {
          return Collections.EMPTY_LIST;
      }
  }