private static Map parseFilterList()

in util/src/main/java/org/apache/aries/util/manifest/ManifestHeaderProcessor.java [686:758]
61 lines of code
18 McCabe index (conditional complexity)

  private static Map<String, String> parseFilterList(String filter) {

    Map<String, String> result = new HashMap<String, String>();
    Set<String> negatedVersions = new HashSet<String>();
    Set<String> negatedBundleVersions = new HashSet<String>();

    String lowerVersion = null;
    String upperVersion = null;
    String lowerBundleVersion = null;
    String upperBundleVersion = null;

    Matcher m = FILTER_ATTR.matcher(filter);
    while (m.find()) {
      boolean negation = m.group(1) != null;
      String attr = m.group(2);
      String op = m.group(3);
      String value = m.group(4);

      if (Constants.VERSION_ATTRIBUTE.equals(attr)) {
        if (negation) {
          negatedVersions.add(value);
        } else {
          if (GREATER_EQ_OP.equals(op))
            lowerVersion = value;
          else if (LESS_EQ_OP.equals(op))
            upperVersion = value;
          else
            throw new IllegalArgumentException();
        }
      } else if (Constants.BUNDLE_VERSION_ATTRIBUTE.equals(attr)) {
        // bundle-version is like version, but may be specified at the
        // same time
        // therefore we have similar code with separate variables
        if (negation) {
          negatedBundleVersions.add(value);
        } else {
          if (GREATER_EQ_OP.equals(op))
            lowerBundleVersion = value;
          else if (LESS_EQ_OP.equals(op))
            upperBundleVersion = value;
          else
            throw new IllegalArgumentException();
        }
      } else {
        result.put(attr, value);
      }
    }

    if (lowerVersion != null) {
      StringBuilder versionAttr = new StringBuilder(lowerVersion);
      if (upperVersion != null) {
        versionAttr.append(",").append(upperVersion).insert(0,
            negatedVersions.contains(lowerVersion) ? '(' : '[').append(
            negatedVersions.contains(upperVersion) ? ')' : ']');
      }

      result.put(Constants.VERSION_ATTRIBUTE, versionAttr.toString());
    }
    // Do it again for bundle-version
    if (lowerBundleVersion != null) {
      StringBuilder versionAttr = new StringBuilder(lowerBundleVersion);
      if (upperBundleVersion != null) {
        versionAttr.append(",").append(upperBundleVersion).insert(0,
            negatedBundleVersions.contains(lowerBundleVersion) ? '(' : '[')
            .append(
                negatedBundleVersions.contains(upperBundleVersion) ? ')' : ']');
      }

      result.put(Constants.BUNDLE_VERSION_ATTRIBUTE, versionAttr.toString());
    }

    return result;
  }