From 498db37a7c7d500fc0a0aa062b5177b521130442 Mon Sep 17 00:00:00 2001
From: Gleb Minaev <43728100+lounres@users.noreply.github.com>
Date: Mon, 8 Jul 2024 18:08:54 +0300
Subject: [PATCH] Add requirement on non-emptiness of composite trajectory
 parts list.

---
 .../kotlin/space/kscience/trajectory/Trajectory2D.kt          | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/trajectory-kt/src/commonMain/kotlin/space/kscience/trajectory/Trajectory2D.kt b/trajectory-kt/src/commonMain/kotlin/space/kscience/trajectory/Trajectory2D.kt
index ddf7a67..9cd69a3 100644
--- a/trajectory-kt/src/commonMain/kotlin/space/kscience/trajectory/Trajectory2D.kt
+++ b/trajectory-kt/src/commonMain/kotlin/space/kscience/trajectory/Trajectory2D.kt
@@ -179,6 +179,10 @@ public fun CircleTrajectory2D(
 @Serializable
 @SerialName("composite")
 public class CompositeTrajectory2D(public val segments: List<Trajectory2D>) : Trajectory2D {
+    init {
+        require(segments.isNotEmpty()) { "A composite trajectory cannot consist of an empty list of trajectories" }
+    }
+
     override val length: Double get() = segments.sumOf { it.length }
 
     override val beginPose: Pose2D get() = segments.first().beginPose