feat(Event Frame Work): add intermediate superclass for PolicyDefinition Events hierarchy (#1915)

* feat: add intermediate superclass for PolicyDefinition Events hierarchy

* doc: adding java doc to classes

Author: janpmeyer

spi/common/core-spi/src/main/java/org/eclipse/dataspaceconnector/spi/event/policydefinition/PolicyDefinitionCreated.java

@@ -9,13 +9,13 @@
  *
  *  Contributors:
  *       Bayerische Motoren Werke Aktiengesellschaft (BMW AG) - initial API and implementation
+ *       Fraunhofer Institute for Software and Systems Engineering - expending Event classes
  *
  */
 
 package org.eclipse.dataspaceconnector.spi.event.policydefinition;
 
 import org.eclipse.dataspaceconnector.spi.event.Event;
-import org.eclipse.dataspaceconnector.spi.event.EventPayload;
 
 import java.util.Objects;
 
@@ -48,11 +48,10 @@ protected void validate() {
         }
     }
 
-    public static class Payload extends EventPayload {
-        private String policyDefinitionId;
-
-        public String getPolicyDefinitionId() {
-            return policyDefinitionId;
-        }
+    /**
+     * This class contains all event specific attributes of a PolicyDefinition Creation Event
+     *
+     */
+    public static class Payload extends PolicyDefinitionEventPayload {
     }
 }

spi/common/core-spi/src/main/java/org/eclipse/dataspaceconnector/spi/event/policydefinition/PolicyDefinitionDeleted.java

@@ -9,13 +9,13 @@
  *
  *  Contributors:
  *       Bayerische Motoren Werke Aktiengesellschaft (BMW AG) - initial API and implementation
+ *       Fraunhofer Institute for Software and Systems Engineering - expending Event classes
  *
  */
 
 package org.eclipse.dataspaceconnector.spi.event.policydefinition;
 
 import org.eclipse.dataspaceconnector.spi.event.Event;
-import org.eclipse.dataspaceconnector.spi.event.EventPayload;
 
 import java.util.Objects;
 
@@ -48,11 +48,10 @@ protected void validate() {
         }
     }
 
-    public static class Payload extends EventPayload {
-        private String policyDefinitionId;
-
-        public String getPolicyDefinitionId() {
-            return policyDefinitionId;
-        }
+    /**
+     * This class contains all event specific attributes of a PolicyDefinition Deletion Event
+     *
+     */
+    public static class Payload extends PolicyDefinitionEventPayload {
     }
 }

spi/common/core-spi/src/main/java/org/eclipse/dataspaceconnector/spi/event/policydefinition/PolicyDefinitionEventPayload.java

@@ -0,0 +1,33 @@
+/*
+ *  Copyright (c) 2022 Bayerische Motoren Werke Aktiengesellschaft (BMW AG)
+ *
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Apache License, Version 2.0 which is available at
+ *  https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Contributors:
+ *       Bayerische Motoren Werke Aktiengesellschaft (BMW AG) - initial API and implementation
+ *       Fraunhofer Institute for Software and Systems Engineering - expending Event classes
+ *
+ */
+
+package org.eclipse.dataspaceconnector.spi.event.policydefinition;
+
+import org.eclipse.dataspaceconnector.spi.event.EventPayload;
+
+
+/**
+ *  Class as organizational between level to catch events of type PolicyDefinition to catch them together in an Event Subscriber
+ *
+ */
+public class PolicyDefinitionEventPayload extends EventPayload {
+
+    protected String policyDefinitionId;
+
+    public String getPolicyDefinitionId() {
+        return policyDefinitionId;
+    }
+
+}