Java 17 Upgrade

[policy/models.git] / models-base / src / main / java / org / onap / policy / models / base / PfModelService.java

diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfModelService.java b/models-base/src/main/java/org/onap/policy/models/base/PfModelService.java
index 67ba59c..94a7c0e 100644 (file)
--- a/models-base/src/main/java/org/onap/policy/models/base/PfModelService.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfModelService.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2019 Nordix Foundation.
+ *  Modifications Copyright (C) 2021 AT&T Intellectual Property. 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.
@@ -20,40 +21,35 @@
 
 package org.onap.policy.models.base;
 
+import jakarta.ws.rs.core.Response;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
-
-import javax.ws.rs.core.Response;
-
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
 import lombok.NonNull;
 
 /**
  * The model service makes Policy Framework models available to all classes in a JVM.
  *
- * <p>The reason for having a model service is to avoid having to pass concept and model definitions
- * down long call chains in modules such as the Policy Framework engine and editor. The model
- * service makes the model and concept definitions available statically.
+ * <p>The reason for having a model service is to avoid having to pass concept and model definitions down long call
+ * chains in modules such as the Policy Framework engine and editor. The model service makes the model and concept
+ * definitions available statically.
  *
- * <p>Note that the use of the model service means that only a single Policy Framework model of a
- * particular type may exist in Policy Framework (particularly the engine) at any time. Of course
- * the model in a JVM can be changed at any time provided all users of the model are stopped and
- * restarted in an orderly manner.
+ * <p>Note that the use of the model service means that only a single Policy Framework model of a particular type may
+ * exist in Policy Framework (particularly the engine) at any time. Of course the model in a JVM can be changed at any
+ * time provided all users of the model are stopped and restarted in an orderly manner.
  */
-public abstract class PfModelService {
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public final class PfModelService {
     // The map holding the models
-    private static Map<String, PfConcept> modelMap = new ConcurrentHashMap<>();
-
-    /**
-     * This class is an abstract static class that cannot be extended.
-     */
-    private PfModelService() {}
+    private static final Map<String, PfConcept> modelMap = new ConcurrentHashMap<>();
 
     /**
      * Register a model with the model service.
      *
-     * @param <M> the generic type
+     * @param <M>      the generic type
      * @param modelKey the key of the model, used to index the model
-     * @param model The model
+     * @param model    The model
      */
     public static <M extends PfConcept> void registerModel(@NonNull final String modelKey, @NonNull final M model) {
         modelMap.put(modelKey, model);
@@ -71,17 +67,17 @@ public abstract class PfModelService {
     /**
      * Get a model from the model service.
      *
-     * @param <M> the generic type
+     * @param <M>      the generic type
      * @param modelKey the key of the model, used to index the model
      * @return The model
      */
     @SuppressWarnings("unchecked")
     public static <M extends PfConcept> M getModel(@NonNull final String modelKey) {
-        final M model = (M) modelMap.get(modelKey);
+        final var model = (M) modelMap.get(modelKey);
 
         if (model == null) {
             throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR,
-                    "Model for name " + modelKey + " not found in model service");
+                "Model for name " + modelKey + " not found in model service");
         }
 
         return model;