pjfanning commented on code in PR #1189:
URL: https://github.com/apache/poi/pull/1189#discussion_r3769229877
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poi-ooxml/src/main/java/org/apache/poi/xddf/usermodel/chart/XDDFDataSource.java:
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@@ -56,6 +56,22 @@ default String getFormula() {
String getFormatCode();
+ /**
+ * Optional number format for a single data point in the numerical cache.
+ * <p>
+ * Return {@code null} when this point has no point-specific format and
should
+ * inherit the series format from {@link #getFormatCode()}.
Implementations that
+ * never use per-point formats can keep the default.
+ * </p>
+ *
+ * @param index zero-based point index
+ * @return the point's format code, or {@code null} to fall back to {@link
#getFormatCode()}
Review Comment:
```suggestion
* @return the data point's format code, or {@code null} if the
underlying class does not support this method or if there is no format code set
for this data point - NumericalCellRangeDataSource is one class that implements
this method.
```
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