From 26ce772cd0e6a01a614a8e22dc405adf0b0c1142 Mon Sep 17 00:00:00 2001
From: lionarius <main@lionarius.ru>
Date: Mon, 9 Sep 2024 18:15:43 +0300
Subject: [PATCH] explicitly throw null ptr exception if function is null

---
 src/main/java/ru/lionarius/IntegralCalculator.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main/java/ru/lionarius/IntegralCalculator.java b/src/main/java/ru/lionarius/IntegralCalculator.java
index 207c225..a69ae82 100644
--- a/src/main/java/ru/lionarius/IntegralCalculator.java
+++ b/src/main/java/ru/lionarius/IntegralCalculator.java
@@ -65,9 +65,13 @@ public class IntegralCalculator {
      * @param lowerBound The lower bound of the integration interval.
      * @param upperBound The upper bound of the integration interval.
      * @return The estimated value of the definite integral.
+     * @throws NullPointerException if the function is null.
      */
     public double calculate(Function<Double, Double> function, double lowerBound, double upperBound) {
-        if (lowerBound == upperBound) {
+        if (function == null)
+            throw new NullPointerException("function cannot be null");
+
+        if (lowerBound == upperBound) { 
             this.callProgressCallback(0, 1);
             this.callProgressCallback(1, 1);