Add endpoint to check for nested modfication reference

src/main/java/org/gridsuite/study/server/controller/NetworkModificationController.java

@@ -70,4 +70,9 @@ public ResponseEntity<Void> updateNetworkModificationsMetadata(@RequestParam("uu
         networkModificationService.updateNetworkModificationsMetadata(networkModificationUuids, metadata);
         return ResponseEntity.ok().build();
     }
+
+    @GetMapping(value = "/containers/references/exists")
+    public ResponseEntity<Boolean> hasModificationReferences(@RequestParam("uuids") List<UUID> containerUuids) {
+        return ResponseEntity.ok().body(networkModificationService.hasModificationReferences(containerUuids));
+    }
 }

src/main/java/org/gridsuite/study/server/service/NetworkModificationService.java

@@ -677,6 +677,13 @@ public List<UUID> findAllChildrenUuids(List<UUID> compositeUuids) {
         ).getBody();
     }
 
+    public boolean hasModificationReferences(List<UUID> containerUuids) {
+        String path = UriComponentsBuilder.fromPath("containers/references/exists")
+                .queryParam(UUIDS, containerUuids)
+                .build().toUriString();
+        return Boolean.TRUE.equals(restTemplate.getForObject(getNetworkModificationServerURI(false) + path, Boolean.class));
+    }
+
     /**
      * References among {@code modificationUuids} and among the modifications nested in them: getReferences() does not
      * descend into composites, so a reference sitting inside a copied/inserted composite must be looked up explicitly.

src/test/java/org/gridsuite/study/server/controller/NetworkModificationControllerTest.java

@@ -158,4 +158,17 @@ void testUpdateNetworkModificationsMetadata() throws Exception {
 
         verify(networkModificationService).updateNetworkModificationsMetadata(List.of(firstUuid, secondUuid), metadata);
     }
+
+    @Test
+    void testhasModificationReference() throws Exception {
+        UUID firstUuid = UUID.randomUUID();
+        UUID secondUuid = UUID.randomUUID();
+
+        mockMvc.perform(get(BASE_URL + "/containers/references/exists")
+                        .param("uuids", firstUuid.toString(), secondUuid.toString())
+                        .contentType(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().string("false"));
+        verify(networkModificationService).hasModificationReferences(List.of(firstUuid, secondUuid));
+    }
 }

src/test/java/org/gridsuite/study/server/service/NetworkModificationServiceTest.java

@@ -157,4 +157,13 @@
 
         verifyNoMoreInteractions(restTemplate);
     }
+
+    @Test
+    void testHasModificationReferences() {
+        UUID modificationUuid = UUID.randomUUID();
+        String expectedUrl = NETWORK_MODIFICATION_SERVER_URI + "/v1/containers/references/exists?uuids=" + modificationUuid;
+
+        networkModificationService.hasModificationReferences(List.of(modificationUuid));
+        verify(restTemplate).getForObject(eq(expectedUrl), eq(Boolean.class));
+    }
 }