src/main/java/org/apache/log4j/rolling/helper/GZCompressAction.java [61:99]:
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    final File source, final File destination, final boolean deleteSource) {
    if (source == null) {
      throw new NullPointerException("source");
    }

    if (destination == null) {
      throw new NullPointerException("destination");
    }

    this.source = source;
    this.destination = destination;
    this.deleteSource = deleteSource;
  }

  /**
   * Compress.
   * @return true if successfully compressed.
   * @throws IOException on IO exception.
   */
  public boolean execute() throws IOException {
    return execute(source, destination, deleteSource);
  }

  /**
   * Compress a file.
   *
   * @param source file to compress, may not be null.
   * @param destination compressed file, may not be null.
   * @param deleteSource if true, attempt to delete file on completion.  Failure to delete
   * does not cause an exception to be thrown or affect return value.
   * @return true if source file compressed.
   * @throws IOException on IO exception.
   */
  public static boolean execute(
    final File source, final File destination, final boolean deleteSource)
          throws IOException {
    if (source.exists()) {
      FileInputStream fis = new FileInputStream(source);
      FileOutputStream fos = new FileOutputStream(destination);
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src/main/java/org/apache/log4j/rolling/helper/ZipCompressAction.java [62:100]:
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    final File source, final File destination, final boolean deleteSource) {
    if (source == null) {
      throw new NullPointerException("source");
    }

    if (destination == null) {
      throw new NullPointerException("destination");
    }

    this.source = source;
    this.destination = destination;
    this.deleteSource = deleteSource;
  }

  /**
   * Compress.
   * @return true if successfully compressed.
   * @throws IOException on IO exception.
   */
  public boolean execute() throws IOException {
    return execute(source, destination, deleteSource);
  }

  /**
   * Compress a file.
   *
   * @param source file to compress, may not be null.
   * @param destination compressed file, may not be null.
   * @param deleteSource if true, attempt to delete file on completion.  Failure to delete
   * does not cause an exception to be thrown or affect return value.
   * @return true if source file compressed.
   * @throws IOException on IO exception.
   */
  public static boolean execute(
    final File source, final File destination, final boolean deleteSource)
          throws IOException {
    if (source.exists()) {
      FileInputStream fis = new FileInputStream(source);
      FileOutputStream fos = new FileOutputStream(destination);
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