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commit 3ccbfd9a003028e6a3af73584a11fb7b6e4449f5
Author: Alex Herbert <aherb...@apache.org>
AuthorDate: Fri May 16 14:07:31 2025 +0100
PMD fix: Add FunctionalInterface annotation
---
.../java/org/apache/commons/statistics/descriptive/NaNTransformer.java | 1 +
.../org/apache/commons/statistics/descriptive/StatisticAccumulator.java | 1 +
.../commons/statistics/inference/KolmogorovSmirnovDistribution.java | 1 +
.../org/apache/commons/statistics/inference/UnconditionedExactTest.java | 1 +
4 files changed, 4 insertions(+)
diff --git
a/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/NaNTransformer.java
b/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/NaNTransformer.java
index 5b687b6..79174b6 100644
---
a/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/NaNTransformer.java
+++
b/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/NaNTransformer.java
@@ -39,6 +39,7 @@ package org.apache.commons.statistics.descriptive;
* <p>This interface allows implementations to respect the behaviour of
* {@link Double#compare(double, double)}, or implement different behaviour.
*/
+@FunctionalInterface
interface NaNTransformer {
/**
* Pre-process the data for partitioning.
diff --git
a/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/StatisticAccumulator.java
b/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/StatisticAccumulator.java
index 693396d..6bc22f9 100644
---
a/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/StatisticAccumulator.java
+++
b/commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/StatisticAccumulator.java
@@ -23,6 +23,7 @@ package org.apache.commons.statistics.descriptive;
*
* @since 1.1
*/
+@FunctionalInterface
public interface StatisticAccumulator<T extends StatisticResult> {
/**
diff --git
a/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/KolmogorovSmirnovDistribution.java
b/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/KolmogorovSmirnovDistribution.java
index 9de9b7a..4c4ac89 100644
---
a/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/KolmogorovSmirnovDistribution.java
+++
b/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/KolmogorovSmirnovDistribution.java
@@ -706,6 +706,7 @@ final class KolmogorovSmirnovDistribution {
* Defines a scaled power function.
* Package-private to allow the main sf method to be called direct in
testing.
*/
+ @FunctionalInterface
interface ScaledPower {
/**
* Compute the number {@code x} raised to the power {@code n}.
diff --git
a/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/UnconditionedExactTest.java
b/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/UnconditionedExactTest.java
index 51e63ca..06c703b 100644
---
a/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/UnconditionedExactTest.java
+++
b/commons-statistics-inference/src/main/java/org/apache/commons/statistics/inference/UnconditionedExactTest.java
@@ -517,6 +517,7 @@ public final class UnconditionedExactTest {
/**
* Compute the statistic for Boschloo's test.
*/
+ @FunctionalInterface
private interface BoschlooStatistic {
/**
* Compute Fisher's p-value for the 2x2 contingency table with the
observed
