fix: $RefParser.java replaceWith$Ref when it contains other properties

closes #18

Author: ivangsa

src/main/java/io/zenwave360/jsonrefparser/$RefParser.java

@@ -319,14 +319,11 @@ private void dereference(ExtendedJsonContext jsonContext, Object value, String[]
 
     private void replaceWith$Ref(ExtendedJsonContext jsonContext, String jsonPath, Object resolved) {
         Map<String, Object> original = jsonContext.read(jsonPath);
-        if (resolved instanceof Map) {
-            for (Map.Entry<String, Object> entry : (original).entrySet()) {
-                if(!entry.getKey().equals("$ref")) {
-                    ((Map) resolved).put(entry.getKey(), entry.getValue());
-                }
-            }
-        }
-        jsonContext.set(jsonPath, resolved);
+        Map<String, Object> replacement = new LinkedHashMap<>();
+        replacement.putAll(original);
+        replacement.remove("$ref");
+        replacement.putAll((Map) resolved);
+        jsonContext.set(jsonPath, replacement);
     }
 
     private Object dereference($Ref $ref, ExtendedJsonContext jsonContext, URI currentFileURL)  {

src/test/java/io/zenwave360/jsonrefparser/GH18.java

@@ -0,0 +1,20 @@
+package io.zenwave360.jsonrefparser;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.File;
+
+public class GH18 {
+
+    @Test
+    public void test() throws Exception {
+        $RefParser refParser = new $RefParser(new File("src/test/resources/GH-18.json"));
+        refParser.withOptions(new $RefParserOptions().withOnCircular($RefParserOptions.OnCircular.SKIP));
+        $Refs refs = refParser.parse().dereference().getRefs();
+        String schema = refs.schema().toString();
+        Assert.assertTrue(schema.contains("lorem={title=lorem"));
+        Assert.assertTrue(schema.contains("ipsum={title=ipsum"));
+        System.out.println(refs.schema());
+    }
+}

src/test/resources/GH-18.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "myDummySchema",
+  "properties": {
+    "lorem": {
+      "title": "lorem",
+      "$ref": "https://json.schemastore.org/base.json#/definitions/nullable-boolean"
+    },
+    "ipsum": {
+      "title": "ipsum",
+      "$ref": "https://json.schemastore.org/base.json#/definitions/nullable-boolean"
+    }
+  }
+}