refs - #995 validating against resolved definitions

Author: gracekarina

modules/swagger-parser/src/main/java/io/swagger/parser/processors/ExternalRefProcessor.java

@@ -210,12 +210,17 @@ private void processDiscriminator(String discriminator, Map<String, Property> pr
                     }
                 }else if (prop.getValue() instanceof RefProperty) {
                     String ref = ((RefProperty) prop.getValue()).getSimpleRef();
-                    Object resolved = swagger.getDefinitions().get(ref);
-                    if (resolved instanceof ModelImpl) {
-                        ModelImpl schema = (ModelImpl) resolved;
-                        if (schema.getEnum() != null) {
-                            for (String name : schema.getEnum()) {
-                                processRefProperty(new RefProperty(RefType.DEFINITION.getInternalPrefix() + name), file);
+                    for (String key : cache.getRenameCache().keySet()) {
+                        String value = cache.getRenamedRef(key);
+                        if (value.equals(ref)) {
+                            Object resolved = cache.getResolutionCache().get(key);
+                            if (resolved instanceof ModelImpl) {
+                                ModelImpl schema = (ModelImpl) resolved;
+                                if (schema.getEnum() != null) {
+                                    for (String name : schema.getEnum()) {
+                                        processRefProperty(new RefProperty(RefType.DEFINITION.getInternalPrefix() + name), file);
+                                    }
+                                }
                             }
                         }
                     }