From 151d44b3628cec4f077d21dd7955a49f7710b8db Mon Sep 17 00:00:00 2001
From: Anton Romanov <a.romanov@ulstu.ru>
Date: Mon, 27 Feb 2023 23:20:45 +0400
Subject: [PATCH] group list of time series tendencies

---
 src/main/java/ru/ulstu/service/TimeSeriesService.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main/java/ru/ulstu/service/TimeSeriesService.java b/src/main/java/ru/ulstu/service/TimeSeriesService.java
index e9bf4b0..d7b4920 100644
--- a/src/main/java/ru/ulstu/service/TimeSeriesService.java
+++ b/src/main/java/ru/ulstu/service/TimeSeriesService.java
@@ -45,7 +45,11 @@ public class TimeSeriesService {
     }
 
     public List<TimeSeries> getGroupedTendencies(List<TimeSeries> timeSeriesList) {
-        return timeSeriesList.stream().map(this::getGroupedTendencies).collect(Collectors.toList());
+        return timeSeriesList
+                .stream()
+                .filter(ts -> ts.getValues() != null && ts.getLength() > 5)
+                .map(this::getGroupedTendencies)
+                .collect(Collectors.toList());
     }
 
     public TimeSeries getGroupedTendencies(TimeSeries timeSeries) {