1 files changed, 53 insertions, 0 deletions
diff --git a/src/main/java/org/onap/pnfsimulator/simulator/TemplatePatcher.java b/src/main/java/org/onap/pnfsimulator/simulator/TemplatePatcher.java
new file mode 100644
index 0000000..1114d3c
--- /dev/null
+++ b/src/main/java/org/onap/pnfsimulator/simulator/TemplatePatcher.java
@@ -0,0 +1,53 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PNF-REGISTRATION-HANDLER
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.pnfsimulator.simulator;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import org.springframework.stereotype.Component;
+
+import java.util.Map;
+
+@Component
+class TemplatePatcher {
+
+    JsonObject mergeTemplateWithPatch(JsonObject templateJson, JsonObject patchJson) {
+        JsonObject template = templateJson.deepCopy();
+        patchTemplateNode(template, patchJson);
+        return template;
+    }
+
+    private void patchTemplateNode(JsonObject templateJson, JsonObject patchJson) {
+        for (Map.Entry<String, JsonElement> stringJsonElementEntry : patchJson.entrySet()) {
+            String patchKey = stringJsonElementEntry.getKey();
+            JsonElement patchValue = stringJsonElementEntry.getValue();
+            JsonElement templateElement = templateJson.get(patchKey);
+
+            if (!patchValue.isJsonObject() || templateElement == null || !templateElement.isJsonObject()) {
+                templateJson.remove(patchKey);
+                templateJson.add(patchKey, patchValue);
+            } else {
+                patchTemplateNode(templateElement.getAsJsonObject(), patchValue.getAsJsonObject());
+            }
+
+        }
+    }
+}