Function msOWSNegotiateUpdateSequence

mapows.c:2121–2181

 */

int msOWSNegotiateUpdateSequence(const char *requested_updatesequence, const char *updatesequence) {
  int i;
  int valtype1 = 1; /* default datatype for updatesequence passed by client */
  int valtype2 = 1; /* default datatype for updatesequence set by server */
  struct tm tm_requested_updatesequence, tm_updatesequence;

  /* if not specified by client, or set by server,
     server responds with latest Capabilities XML */
  if (! requested_updatesequence || ! updatesequence)
    return -1; 

  /* test to see if server value is an integer (1), string (2) or timestamp (3) */
  if (msStringIsInteger(updatesequence) == MS_FAILURE)
    valtype1 = 2;

  if (valtype1 == 2) { /* test if timestamp */
    msTimeInit(&tm_updatesequence);
    if (msParseTime(updatesequence, &tm_updatesequence) == MS_TRUE)
      valtype1 = 3;
    msResetErrorList();
  }

  /* test to see if client value is an integer (1), string (2) or timestamp (3) */
  if (msStringIsInteger(requested_updatesequence) == MS_FAILURE)
    valtype2 = 2;

  if (valtype2 == 2) { /* test if timestamp */
    msTimeInit(&tm_requested_updatesequence);
    if (msParseTime(requested_updatesequence, &tm_requested_updatesequence) == MS_TRUE)
      valtype2 = 3;
    msResetErrorList();
  }

  /* if the datatypes do not match, do not compare, */
  if (valtype1 != valtype2)
    return -1;

  if (valtype1 == 1) { /* integer */
    if (atoi(requested_updatesequence) < atoi(updatesequence))
      return -1;

    if (atoi(requested_updatesequence) > atoi(updatesequence))
      return 1;

    if (atoi(requested_updatesequence) == atoi(updatesequence))
      return 0;
  }

  if (valtype1 == 2) /* string */
    return strcasecmp(requested_updatesequence, updatesequence);

  if (valtype1 == 3) { /* timestamp */
    /* compare timestamps */
    i = msDateCompare(&tm_requested_updatesequence, &tm_updatesequence) +
        msTimeCompare(&tm_requested_updatesequence, &tm_updatesequence);
    return i;
  }