Chapter 9. Zip

// Read data from the Zip file f

// The UTF-8 charset
Charset utf8 = Charset.forName("utf8");

// Create the Zip file object. Text and file paths in the Zip file are encoded
// in UTF-8
ZipFile zf = new ZipFile(f, utf8, utf8);
try
{
  // Print out the names of the child entries of the directory entry /d
  ZipDirectoryEntry d = (ZipDirectoryEntry) zf.get(new AbsoluteLocation("/d"));
  System.out.println("Contents of /d: " + d.getChildEntries().keySet());

  // Print out the contents of the file /d/f
  ZipFileEntry df = (ZipFileEntry) d.getChildEntries().get("f");
  
  // Use the EntityFS utility class Files to read the text in the file.
  System.out.println(Files.readTextFile(df, utf8));
}
finally
{
  // Close the Zip archive to release all resources associated with it.
  zf.close();
}

// Create a Zip archive object for the archive in the file f
// The Zip file metadata is encoded using the UTF-8 charset.
ZipFile zf = new ZipFile(f, Charsets.UTF8, Charsets.UTF8);

// Print out the archive comment
System.out.println(zf.getComment());

// Get the file entry /f1
ZipFileEntry zfe = (ZipFileEntry) zf.get(new AbsoluteLocation("/f1"));

// Print out its comment
System.out.println(zfe.getComment());

// Print out its compression method
System.out.println(zfe.getCompressionMethod().getName());

// Print out its Unix permissions mode
System.out.println(
  ((UnixExternalFileAttributes) zfe.getExternalFileAttributes()).
    getEntityMode());

// Print out the value of the last modification time from the extended timestamp
// extra field from the local file header. Format the data using a
// SimpleDateFormat object.
System.out.println(
  new SimpleDateFormat("yyyyMMdd").format(
    zfe.getExtraField(ExtendedTimestampExtraField.class, true).
      getLastModified()));

// Build the Zip file "myArchive.zip" in the directory targetDir.
RandomlyAccessibleFile zipFile = Directories.newFile(targetDir, "myArchive.zip");

// Configure the global Zip builder settings.

// Create a factory object for the external attributes metadata
ZipExternalFileAttributesFactory extAttrsFactory =
  new UnixExternalFileAttributesFactory(
    //
    // Set files to be world readable
    UnixEntityMode.forCode(0644),
    //
    // Set directories to be world executable
    UnixEntityMode.forCode(0755));

ZipBuilderSettings settings = new ZipBuilderSettings().
  //
  // Set the default file entry settings.
  setDefaultFileEntrySettings(
    new ZipEntrySettings().
      //
      // Use bzip2 compression for files entries.
      // NOTE: bzip2 is not supported by all Zip implementations!
      setCompressionMethod(BZip2CompressionMethod.INSTANCE).
      //
      // Use the external attributes factory created above
      setExternalFileAttributesFactory(extAttrsFactory).
      //
      // Add an extra field factory for creating the Unicode path extra field
      // that stores the entry's path name encoded in UTF-8.
      addExtraFieldFactory(UnicodePathExtraFieldFactory.INSTANCE)).
  //
  // Set the default directory entry settings.
  setDefaultDirectoryEntrySettings(
    new ZipEntrySettings().
      //
      // Use the external attributes factory created above.
      setExternalFileAttributesFactory(extAttrsFactory).
      //
      // An extra field factory for creating the Unicode path extra field.
      addExtraFieldFactory(UnicodePathExtraFieldFactory.INSTANCE)).
  //
  // Set a Zip file comment.
  setFileComment("This is myArchive.zip's comment.");

// Create the Zip builder
ZipBuilder zb = new ZipBuilder(zipFile, settings);

// Add a global rule that says that all script files (files ending with .sh)
// should be world executable.
zb.addRule(
  new ArchiveEntrySettingsRule<ZipEntrySettings>(
    new ZipEntrySettings().
      //
      // This object only has to contain the difference between the default file
      // settings and the settings for this rule due to the way in which
      // settings are combined.
      setExternalFileAttributesFactory(
        new UnixExternalFileAttributesFactory(
          //
          // Files are world executable.
          UnixEntityMode.forCode(0755),
          //
          // Directories are world executable. (No directories will be matched
          // by the rule's filter, though.)
          UnixEntityMode.forCode(0755))),
    //
    // The filter that determines which entries the rule will be applied to.
    FileETAF.FILTER.and(
      new NameGlobETAF("*.sh"))));

// Add the directory hierarchy under the directory src to the location /source
// in the archive.
zb.addRecursively(src, new AbsoluteLocation("/source"));

// Close the builder to finish writing the archive.
zb.close();

// Build the Zip file "myArchive.zip" in the directory targetDir. Use the best
// possible (deflate) compression.
RandomlyAccessibleFile zipFile = Directories.newFile(targetDir, "myArchive.zip");

// Configure the global Zip builder settings.

ZipBuilderSettings settings = new ZipBuilderSettings().
  //
  // Set maximum compression level for the default file compression method
  // (deflate)
  setCompressionLevel(CompressionLevel.BEST);

// Create the Zip builder
ZipBuilder zb = new ZipBuilder(zipFile, settings);

// Add the directory hierarchy under the directory src to the location /source
// in the archive.
zb.addRecursively(src, new AbsoluteLocation("/source"));

// Close the builder to finish writing the archive.
zb.close();