[bisq-network/bisq] Validate phone numbers (#3134)

[battleofwizards]

battleofwizards commented on this pull request.



> +    public PhoneNumberValidator(String isoCountryCode) {
+        this.isoCountryCode = isoCountryCode;
+        this.countryCallingCodes = new CountryCallingCodes();
+        this.callingCode = countryCallingCodes.getCallingCode(isoCountryCode);
+        this.normalizedCallingCode = countryCallingCodes.getNormalizedCallingCode(isoCountryCode);
+    }
+
+
+    @Override
+    public ValidationResult validate(String input) {
+        normalizedPhoneNumber = null;
+        ValidationResult result = super.validate(input);
+        if (!result.isValid) {
+            return result;
+        }
+        final String trimmedInput = input.trim();

I was referring to objects in general to explain why local finals are overkill. Also, it wouldn't make sense to use local finals selectively depending on the class (im)mutability.

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