[YANGTOOLS-1224] Data codecs may mis-enforce String length constraints

Relates — Wed, 24 Feb 2021 10:49:17 +0000

RFC7950 states that:

 A "length" statement restricts the number of Unicode characters in
 the string.

This is distinct diffrent what java.lang.String.length() provides:

Returns the length of this string. The length is equal to the number of Unicode code units in the string.

with the following (from java.lang.Character):

In the Java SE API documentation, Unicode code point is used for character values in the range between U+0000 and U+10FFFF,
and Unicode code unit is used for 16-bit char values that are code units of the UTF-16 encoding.

We should not be checking the String.length(), but rather String.codePointCount(). Audit all enforcement points for correct checks.

OpenDaylight JIRA

[YANGTOOLS-1224] Data codecs may mis-enforce String length constraints