garydgregory commented on code in PR #276:
URL: https://github.com/apache/commons-csv/pull/276#discussion_r1000733851
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src/main/java/org/apache/commons/csv/CSVFormat.java:
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@@ -356,11 +356,11 @@ public Builder setDelimiter(final String delimiter) {
/**
* Sets the duplicate header names behavior.
*
- * @param duplicateHeaderMode the duplicate header names behavior
+ * @param duplicateHeaderMode the duplicate header names behavior, may
not be null
* @return This instance.
*/
public Builder setDuplicateHeaderMode(final DuplicateHeaderMode
duplicateHeaderMode) {
- this.duplicateHeaderMode = duplicateHeaderMode;
+ this.duplicateHeaderMode =
Objects.requireNonNull(duplicateHeaderMode, "Mode required");
Review Comment:
Why not use the `validate()` method like all other checks?
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