Method parseMasks

java/core/src/java/org/apache/orc/impl/ParserUtils.java:561–582

Annotate the given schema with the masking information. Format of the string is a mask-list. mask-list = mask (';' mask-list)? mask = mask-name (',' parameter) ':' field-list field-list = field-name ( ',' field-list )? field-name = number | field-part ('.

(StringPosition source, TypeDescription schema)

   * @throws IllegalArgumentException if there are conflicting masks for a field
   */
  public static void parseMasks(StringPosition source, TypeDescription schema) {
    if (source.hasCharactersLeft()) {
      do {
        // parse the mask and parameters, but only get the underlying string
        int start = source.position;
        parseName(source);
        while (consumeChar(source, ',')) {
          parseName(source);
        }
        String maskString = source.fromPosition(start);
        requireChar(source, ':');
        for (TypeDescription field : findSubtypeList(schema, source)) {
          String prev = field.getAttributeValue(TypeDescription.MASK_ATTRIBUTE);
          if (prev != null && !prev.equals(maskString)) {
            throw new IllegalArgumentException("Conflicting encryption masks " +
                maskString + " and " + prev);
          }
          field.setAttribute(TypeDescription.MASK_ATTRIBUTE, maskString);
        }
      } while (consumeChar(source, ';'));
    }
  }

  public static MaskDescriptionImpl buildMaskDescription(String value) {
    StringPosition source = new StringPosition(value);