use model utils check instead of instanceof

Author: wing328

modules/openapi-generator/src/main/java/org/openapitools/codegen/InlineModelResolver.java

@@ -770,9 +770,8 @@ private void flattenProperties(OpenAPI openAPI, Map<String, Schema> properties,
         for (Map.Entry<String, Schema> propertiesEntry : properties.entrySet()) {
             String key = propertiesEntry.getKey();
             Schema property = propertiesEntry.getValue();
-            if (property instanceof ObjectSchema && ((ObjectSchema) property).getProperties() != null
-                    && ((ObjectSchema) property).getProperties().size() > 0) {
-                ObjectSchema op = (ObjectSchema) property;
+            if (ModelUtils.isObjectSchema(property)) {
+                Schema op = property;
                 String modelName = resolveModelName(op.getTitle(), path + "_" + key);
                 Schema model = modelFromProperty(openAPI, op, modelName);
                 String existing = matchGenerated(model);
@@ -789,8 +788,8 @@ private void flattenProperties(OpenAPI openAPI, Map<String, Schema> properties,
                 }
             } else if (ModelUtils.isArraySchema(property)) {
                 Schema inner = ModelUtils.getSchemaItems(property);
-                if (inner instanceof ObjectSchema) {
-                    ObjectSchema op = (ObjectSchema) inner;
+                if (ModelUtils.isObjectSchema(inner)) {
+                    Schema op = inner;
                     if (op.getProperties() != null && op.getProperties().size() > 0) {
                         flattenProperties(openAPI, op.getProperties(), path);
                         String modelName = resolveModelName(op.getTitle(), path + "_" + key);
@@ -819,8 +818,8 @@ private void flattenProperties(OpenAPI openAPI, Map<String, Schema> properties,
                 }
             } else if (ModelUtils.isMapSchema(property)) {
                 Schema inner = ModelUtils.getAdditionalProperties(property);
-                if (inner instanceof ObjectSchema) {
-                    ObjectSchema op = (ObjectSchema) inner;
+                if (ModelUtils.isObjectSchema(inner)) {
+                    Schema op = inner;
                     if (op.getProperties() != null && op.getProperties().size() > 0) {
                         flattenProperties(openAPI, op.getProperties(), path);
                         String modelName = resolveModelName(op.getTitle(), path + "_" + key);

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/OCamlClientCodegen.java

@@ -281,7 +281,7 @@ private boolean isEnumSchema(Schema schema) {
     private void collectEnumSchemas(String parentName, String sName, Schema schema) {
         if (ModelUtils.isArraySchema(schema)) {
             collectEnumSchemas(parentName, sName, ModelUtils.getSchemaItems(schema));
-        } else if (schema instanceof MapSchema && schema.getAdditionalProperties() instanceof Schema) {
+        } else if (ModelUtils.isMapSchema(schema) && schema.getAdditionalProperties() instanceof Schema) {
             collectEnumSchemas(parentName, sName, (Schema) schema.getAdditionalProperties());
         } else if (isEnumSchema(schema)) {
             String h = hashEnum(schema);