133 be add backend service project changes to the combined history in event history service

src/main/java/edu/stanford/protege/webprotege/linearizationservice/uiHistoryConcern/changes/ChangeType.java

@@ -0,0 +1,7 @@
+package edu.stanford.protege.webprotege.linearizationservice.uiHistoryConcern.changes;
+
+public enum ChangeType {
+    CREATE_ENTITY,
+    DELETE_ENTITY,
+    UPDATE_ENTITY
+}

src/main/java/edu/stanford/protege/webprotege/linearizationservice/uiHistoryConcern/changes/ProjectChangeForEntity.java

@@ -1,12 +1,31 @@
 package edu.stanford.protege.webprotege.linearizationservice.uiHistoryConcern.changes;
 
 import edu.stanford.protege.webprotege.change.ProjectChange;
+import org.jetbrains.annotations.NotNull;
 
 public record ProjectChangeForEntity(String whoficEntityIri,
-                                     ProjectChange projectChange) {
+                                     ChangeType changeType,
+                                     ProjectChange projectChange) implements Comparable<ProjectChangeForEntity> {
 
     public static ProjectChangeForEntity create(String whoficEntityIri,
+                                                ChangeType changeType,
                                                 ProjectChange projectChange) {
-        return new ProjectChangeForEntity(whoficEntityIri, projectChange);
+        return new ProjectChangeForEntity(whoficEntityIri, changeType, projectChange);
+    }
+
+    //All linearization/postcoordination changes are updates made on the whoficEntityIri.
+    // From this microservice we don't create or delete entities. that is the responsibility of the backend-service.
+    public static ProjectChangeForEntity create(String whoficEntityIri,
+                                                ProjectChange projectChange) {
+        return new ProjectChangeForEntity(whoficEntityIri, ChangeType.UPDATE_ENTITY, projectChange);
+    }
+
+    @Override
+    public int compareTo(@NotNull ProjectChangeForEntity other) {
+        int timestampComparison = Long.compare(this.projectChange.getTimestamp(), other.projectChange.getTimestamp());
+        if (timestampComparison != 0) {
+            return timestampComparison;
+        }
+        return this.whoficEntityIri.compareTo(other.whoficEntityIri);
     }
 }

src/test/java/edu/stanford/protege/webprotege/linearizationservice/uiHistoryConcern/changes/ProjectChangesManagerTest.java

@@ -8,7 +8,7 @@
 import edu.stanford.protege.webprotege.linearizationservice.repositories.definitions.LinearizationDefinitionRepository;
 import edu.stanford.protege.webprotege.linearizationservice.uiHistoryConcern.diff.Revision2DiffElementsTranslator;
 import edu.stanford.protege.webprotege.linearizationservice.uiHistoryConcern.nodeRendering.EntityRendererManager;
-import org.junit.jupiter.api.*;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.*;
 import org.mockito.junit.jupiter.MockitoExtension;
@@ -64,7 +64,11 @@ public void GIVEN_validHistories_WHEN_getProjectChangesForHistoriesCalled_THEN_r
         assertEquals(1, result.size());
         Iterator<ProjectChangeForEntity> iterator = result.iterator();
 
-        ProjectChange projectChange = iterator.next().projectChange();
+        ProjectChangeForEntity projectChangeForEntity = iterator.next();
+        ChangeType projectChangeType = projectChangeForEntity.changeType();
+        assertEquals(ChangeType.UPDATE_ENTITY, projectChangeType);
+
+        ProjectChange projectChange = projectChangeForEntity.projectChange();
         assertNotNull(projectChange);
         assertEquals(12345L, projectChange.getTimestamp());
         assertEquals("user1", projectChange.getAuthor().id());
@@ -117,6 +121,7 @@ public void GIVEN_validProjectIdAndRevision_WHEN_getProjectChangesForRevisionCal
 
         assertNotNull(result);
         assertEquals(entityIri, result.whoficEntityIri());
+        assertEquals(ChangeType.UPDATE_ENTITY, result.changeType());
 
         ProjectChange projectChange = result.projectChange();
         assertNotNull(projectChange);