kevdoran commented on a change in pull request #5458:
URL: https://github.com/apache/nifi/pull/5458#discussion_r737576297
##########
File path:
nifi-commons/nifi-properties/src/main/java/org/apache/nifi/util/StringUtils.java
##########
@@ -510,4 +514,27 @@ public static String toTitleCase(String input) {
.map(word -> Character.toTitleCase(word.charAt(0)) +
word.substring(1))
.collect(Collectors.joining(" "));
}
+
+ /**
+ * Escape {@code str} by replacing occurrences of {@code charToEscape}
with {@code escapeChar+charToEscape}
+ * @param str the input string
+ * @param escapeChar the character used for escaping
+ * @param charToEscape the character that needs to be escaped
+ * @return the escaped string
+ */
+ public static String escapeString(String str, char escapeChar, char
charToEscape) {
+ if (str == null || str.isEmpty()) {
+ return null;
+ }
+ StringBuilder result = new StringBuilder();
+ for (int i=0; i<str.length(); i++) {
+ char curChar = str.charAt(i);
+ if (curChar == escapeChar || curChar == charToEscape) {
+ // special char
+ result.append(escapeChar);
+ }
+ result.append(curChar);
Review comment:
Minor, but it would be nice if this utility method were idempotent,
meaning that if I pass it a string that contains some already escaped
characters, it has not effect on those. In other words, all of these
invocations would return the same result:
```
StringUtils.escapeString("key=(value0,value1,value2)", '\\', ',');
StringUtils.escapeString("key=(value0\\,value1,value2)", '\\', ',');
StringUtils.escapeString("key=(value0\\,value1\\,value2)", '\\', ',');
```
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