Added not found exception when deleting stored queries

Author: joke1196

src/main/java/org/humanbrainproject/knowledgegraph/commons/propertyGraph/arango/control/ArangoInternalRepository.java

@@ -12,12 +12,14 @@
 import org.humanbrainproject.knowledgegraph.commons.propertyGraph.arango.control.query.ArangoQueryFactory;
 import org.humanbrainproject.knowledgegraph.commons.propertyGraph.arango.entity.ArangoCollectionReference;
 import org.humanbrainproject.knowledgegraph.commons.propertyGraph.arango.entity.ArangoDocumentReference;
+import org.humanbrainproject.knowledgegraph.commons.propertyGraph.arango.exceptions.StoredQueryNotFoundException;
 import org.humanbrainproject.knowledgegraph.commons.vocabulary.ArangoVocabulary;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+import javax.ws.rs.NotFoundException;
 import java.util.List;
 import java.util.Map;
 
@@ -127,15 +129,17 @@ public boolean doesDocumentExist(ArangoCollectionReference collectionReference,
         return false;
     }
 
-    public void removeInternalDocument(ArangoDocumentReference document) throws IllegalAccessException {
+    public void removeInternalDocument(ArangoDocumentReference document) throws IllegalAccessException, StoredQueryNotFoundException {
         String userId = authorizationContext.getUserId();
         if(userId==null){
             throw new IllegalAccessException("You have to be authenticated if you want to execute this operation");
         }
         ArangoDatabase db = getDB();
         ArangoCollection collection = db.collection(document.getCollection().getName());
-        if (collection.documentExists(document.getKey())) {
+        if ( collection.exists() && collection.documentExists(document.getKey())) {
             collection.deleteDocument(document.getKey());
+        } else {
+            throw new StoredQueryNotFoundException("Query not found");
         }
     }
 }

src/main/java/org/humanbrainproject/knowledgegraph/query/api/QueryAPI.java

@@ -332,6 +332,8 @@ public ResponseEntity<String> removeSpecificationToDB(@PathVariable(ORG) String
             authorizationContext.populateAuthorizationContext(authorization);
             query.removeSpecificationInDb(new StoredQueryReference(new NexusSchemaReference(org, domain, schema, version), id));
             return ResponseEntity.ok("Deleted specification from database");
+        } catch (StoredQueryNotFoundException e){
+            return ResponseEntity.notFound().build();
         } catch (HttpClientErrorException e) {
             return ResponseEntity.status(e.getStatusCode()).build();
         } catch (IllegalAccessException e){