Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21246#discussion_r186999228
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/MaskExpressionsUtils.java
---
@@ -0,0 +1,80 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions;
+
+/**
+ * Contains all the Utils methods used in the masking expressions.
+ */
+public class MaskExpressionsUtils {
+ final static int UNMASKED_VAL = -1;
+
+ /**
+ *
+ * @param c the character to transform
+ * @param maskedUpperChar the character to use instead of a uppercase
letter
+ * @param maskedLowerChar the character to use instead of a lowercase
letter
+ * @param maskedDigitChar the character to use instead of a digit
+ * @param maskedOtherChar the character to use instead of a any other
character
+ * @return masking character for {@param c}
+ */
+ public static int transformChar(
+ final int c,
+ int maskedUpperChar,
+ int maskedLowerChar,
+ int maskedDigitChar,
+ int maskedOtherChar) {
+ switch(Character.getType(c)) {
+ case Character.UPPERCASE_LETTER:
+ if(maskedUpperChar != UNMASKED_VAL) {
+ return maskedUpperChar;
+ }
+ break;
+
+ case Character.LOWERCASE_LETTER:
+ if(maskedLowerChar != UNMASKED_VAL) {
+ return maskedLowerChar;
+ }
+ break;
+
+ case Character.DECIMAL_DIGIT_NUMBER:
+ if(maskedDigitChar != UNMASKED_VAL) {
+ return maskedDigitChar;
+ }
+ break;
+
+ default:
+ if(maskedOtherChar != UNMASKED_VAL) {
+ return maskedOtherChar;
+ }
+ break;
+ }
+
+ return c;
+ }
+
+ /**
+ * Returns the replacement char to use according to the {@param rep}
specified by the user and
+ * the {@param def} default.
+ */
+ public static int getReplacementChar(String rep, int def) {
+ if (rep != null && rep.length() > 0) {
+ return rep.charAt(0);
--- End diff --
`codePointAt()`?
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