ben-roling commented on a change in pull request #3441:
URL: https://github.com/apache/storm/pull/3441#discussion_r804088332
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File path: storm-webapp/src/main/java/org/apache/storm/daemon/ui/UIHelpers.java
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@@ -1746,19 +1746,26 @@ private static Double nullToZero(Double value) {
}
/**
- * sanitizeStreamName.
+ * Sanitizes streamName for use as an identifier in the visualization.
Replaces all characters except A-Z, a-z,
+ * '.', '-', and '_' with '_'. If streamName does not start with A-Z or
a-z, adds '_s' prefix.
* @param streamName streamName
- * @return sanitizeStreamName
+ * @return sanitized stream name
*/
public static String sanitizeStreamName(String streamName) {
- Pattern pattern = Pattern.compile("(?![A-Za-z_\\-:\\.]).");
- Pattern pattern2 = Pattern.compile("^[A-Za-z]");
- Matcher matcher = pattern2.matcher(streamName);
- Matcher matcher2 = pattern.matcher("\\s" + streamName);
- if (matcher.find()) {
- matcher2 = pattern.matcher(streamName);
+ Pattern startsWithLetterPattern = Pattern.compile("^[A-Za-z]");
+ Pattern problemCharacterPattern =
Pattern.compile("(?![A-Za-z_\\-\\.]).");
+
+ Matcher startsWithLetterMatcher =
startsWithLetterPattern.matcher(streamName);
+ Matcher problemCharacterMatcher;
+ if (startsWithLetterMatcher.find()) {
+ problemCharacterMatcher =
problemCharacterPattern.matcher(streamName);
+ } else {
+ // if the streamName starts with non-letter character, prepend
"\s". The backslash will then
+ // get replaced by an underscore, resulting in the prefix of "_s"
in the final sanitized name
+ problemCharacterMatcher = problemCharacterPattern.matcher("\\s" +
streamName);
Review comment:
This bit is a little bizarre. I don't know why the original code was
prefixing the steamName this way, but I left it as it was. The prefix will
ultimately become "_s" with the replaceAll() call that follows. It might as
well have been "_s" here as well. I could change that if it make sense to
others.
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