From 9b8a396159a2c67555455529d3a5895a11e2a092 Mon Sep 17 00:00:00 2001
From: Giorgos Stamatelatos <gstamatelat@gmail.com>
Date: Mon, 22 Aug 2022 20:09:50 +0300
Subject: [PATCH] Add ParetoSampling computed weight assertion

---
 src/main/java/gr/james/sampling/ParetoSampling.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main/java/gr/james/sampling/ParetoSampling.java b/src/main/java/gr/james/sampling/ParetoSampling.java
index 32b1214..2a6153e 100644
--- a/src/main/java/gr/james/sampling/ParetoSampling.java
+++ b/src/main/java/gr/james/sampling/ParetoSampling.java
@@ -137,6 +137,7 @@ public boolean feed(T item, double weight) {
 
         // Calculate item weight
         final Weighted<T> newItem = new Weighted<>(item, (r * (1 - weight)) / ((1 - r) * weight));
+        assert newItem.weight >= 0.0; // weight can also be 0.0 because of double precision
 
         // Add item to reservoir
         if (pq.size() < sampleSize) {