Add addTopic(List<TopicParams>)

New services are typically configured using TopicParameters.  These
are converted into Properties before being passed to
TopicEndpoint.addTopic(), which then converts them into BusTopicParams
before configuring a given topic.  Added
TopicEndpoint.addTopic(List<TopicParams>), which makes it possible
to configure the topics without going into the intermediate Properties.
Furthermore, because TopicParams is a subclass of BusTopicParams, no
conversion is needed for that either, so the TopicParams can be passed
directly into the configuration classes.
Incorporated changes from review.

Change-Id: Id87e2c6812e36ae1a3ac680e6b35208667971782
Issue-ID: POLICY-1953
Signed-off-by: Jim Hahn <jrh3@att.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/parameters/TopicParameterGroup.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/parameters/TopicParameterGroup.java
index 70a06036..f633b0ef 100644
--- a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/parameters/TopicParameterGroup.java
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/parameters/TopicParameterGroup.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2019 Nordix Foundation.
+ *  Modifications Copyright (C) 2019 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.
@@ -20,6 +21,7 @@
 
 package org.onap.policy.common.endpoints.parameters;
 
+import java.util.LinkedList;
 import java.util.List;
 import lombok.Getter;
 import lombok.Setter;
@@ -41,8 +43,8 @@ import org.onap.policy.common.parameters.annotations.NotNull;
 @Setter
 public class TopicParameterGroup extends ParameterGroupImpl {
 
-    private List<TopicParameters> topicSources;
-    private List<TopicParameters> topicSinks;
+    private final List<TopicParameters> topicSources = new LinkedList<>();
+    private final List<TopicParameters> topicSinks = new LinkedList<>();
 
     public TopicParameterGroup() {
         super(TopicParameterGroup.class.getSimpleName());