javax.mail.internet.InternetHeaders#getAllHeaders ( )源码实例Demo

/**
 * Parses metadata stored in a Debian Control File-like format.
 *
 * @see <a href="https://cran.r-project.org/doc/manuals/r-release/R-exts.html#The-DESCRIPTION-file">Description File</a>
 */
public static Map<String, String> parseDescriptionFile(final InputStream in) {
  checkNotNull(in);
  try {
    LinkedHashMap<String, String> results = new LinkedHashMap<>();
    InternetHeaders headers = new InternetHeaders(in);
    Enumeration headerEnumeration = headers.getAllHeaders();
    while (headerEnumeration.hasMoreElements()) {
      Header header = (Header) headerEnumeration.nextElement();
      String name = header.getName();
      String value = header.getValue()
          .replace("\r\n", "\n")
          .replace("\r", "\n"); // TODO: "should" be ASCII only, otherwise need to know encoding?
      results.put(name, value); // TODO: Supposedly no duplicates, is this true?
    }
    return results;
  } catch (MessagingException e) {
    throw new RException(null, e);
  }
}
 

/**
 * Parses the PKG-INFO content as RFC 822 headers (per PEPs 241 and 314). (Yes, Python PKG-INFO information is
 * essentially stored as a file of email headers.)
 */
@VisibleForTesting
static Map<String, List<String>> parsePackageInfo(final InputStream in) throws Exception {
  checkNotNull(in);
  LinkedHashMap<String, List<String>> results = new LinkedHashMap<>();

  // All package info or metadata file types have their metadata stored in the same manner as email headers
  InternetHeaders headers = new InternetHeaders(in);
  Enumeration<Header> headerEnumeration = headers.getAllHeaders();
  while (headerEnumeration.hasMoreElements()) {
    Header header = headerEnumeration.nextElement();
    String underscoreName = header.getName().toLowerCase().replace('-', '_');
    String name = NAME_SUBSTITUTIONS.getOrDefault(underscoreName, underscoreName);
    String value = convertHeaderValue(header.getValue());
    if (!results.containsKey(name)) {
      results.put(name, new ArrayList<>());
    }
    results.get(name).add(value);
  }

  // Wheel metadata can also be stored in the payload section (description only, so far as I'm aware)
  if (!results.containsKey(PyPiAttributes.P_DESCRIPTION)) {
    String text =  Strings.nullToEmpty(CharStreams.toString(new InputStreamReader(in, StandardCharsets.UTF_8))).trim();
    if (!text.isEmpty()) {
      List<String> description = new ArrayList<>();
      description.add(text.replace("\r\n", "\n").replaceAll("[ ]*\\n[ ]*", "\n") + "\n");
      results.put(PyPiAttributes.P_DESCRIPTION, description);
    }
  }

  return results;
}
 

public void copyHeaders(InternetHeaders srcHeaders) {
    Enumeration<Header> headerEn = srcHeaders.getAllHeaders();
    while (headerEn.hasMoreElements()) {
        Header header = headerEn.nextElement();
        setHeader(header.getName(), header.getValue());
    }
}