From 4e0f17399aec0e2842a1c6a7846d6ac5093cf8a7 Mon Sep 17 00:00:00 2001
From: Cliff Casey <cliff@yetanalytics.com>
Date: Wed, 1 Jul 2026 16:05:24 -0400
Subject: [PATCH] fom update and array test

---
 config/HlaFedereplFOM.xml                     | 17 ++++++++++-
 .../com/yetanalytics/ConfigParserTest.java    | 29 +++++++++++++++++++
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/config/HlaFedereplFOM.xml b/config/HlaFedereplFOM.xml
index 07872de..65eb7c0 100644
--- a/config/HlaFedereplFOM.xml
+++ b/config/HlaFedereplFOM.xml
@@ -323,6 +323,13 @@
                     <dataType>GridPosition</dataType>
                     <semantics>Cell occupied after movement.</semantics>
                 </parameter>
+                <parameter>
+                    <name>LocationHistory</name>
+                    <dataType>GridPositionHistory</dataType>
+                    <semantics>
+                        Ordered list of positions occupied by the entity, including the new destination.
+                    </semantics>
+                </parameter>
             </interactionClass>
             <interactionClass>
                 <name>EntityAte</name>
@@ -585,7 +592,15 @@
                 </enumerator>
             </enumeratedData>
         </enumeratedDataTypes>
-        <arrayDataTypes/>
+        <arrayDataTypes>
+            <arrayData>
+                <name>GridPositionHistory</name>
+                <dataType>GridPosition</dataType>
+                <cardinality>Dynamic</cardinality>
+                <encoding>HLAvariableArray</encoding>
+                <semantics>Ordered history of grid positions occupied by an entity.</semantics>
+            </arrayData>
+        </arrayDataTypes>
         <fixedRecordDataTypes>
             <fixedRecordData>
                 <name>GridPosition</name>
diff --git a/src/test/java/com/yetanalytics/ConfigParserTest.java b/src/test/java/com/yetanalytics/ConfigParserTest.java
index 8ae23db..4a36b1b 100644
--- a/src/test/java/com/yetanalytics/ConfigParserTest.java
+++ b/src/test/java/com/yetanalytics/ConfigParserTest.java
@@ -140,6 +140,35 @@ public void handlesFixedRecordFieldAccess() {
         assertEquals(42, result);
     }
 
+    @Test
+    public void handlesFixedRecordFieldAccessInsideArray() {
+        // Test array of fixed records
+        SimulationConfig simConfig = new SimulationConfig(null, null, null, null,
+                "config/HlaFedereplFOM.xml");
+        HLADecoderRegistry decoderRegistry = new HLADecoderRegistry(new HLA1516eEncoderFactory());
+        InjectionHandler ih = new InjectionHandler();
+        ih.setFomXml(new FOMXML(simConfig, decoderRegistry));
+        ih.setHLADecoderRegistry(decoderRegistry);
+
+        byte[] gridPosition = java.nio.ByteBuffer.allocate(Integer.BYTES * 2)
+                .order(java.nio.ByteOrder.BIG_ENDIAN)
+                .putInt(42)
+                .putInt(84)
+                .array();
+
+        byte[] arrayBytes = HLAEncodingTestSupport.variableArray(gridPosition);
+
+        Map<String, byte[]> paramMap = new java.util.HashMap<>();
+        paramMap.put("LocationHistory", arrayBytes);
+
+        InteractionInjectionContext injectionContext = new InteractionInjectionContext("EntityMoved", paramMap);
+        com.yetanalytics.hlaxapi.config.model.Target target = new com.yetanalytics.hlaxapi.config.model.Target(
+            java.util.List.of("LocationHistory", 0, "X"));
+
+        Object result = ih.handleThis(target, injectionContext);
+        assertEquals(42, result);
+    }
+
     @Test
     public void handlesFixedRecordGridPositionFieldAccess() {
         SimulationConfig simConfig = new SimulationConfig(null, null, null, null,