Replace GsonXxxAdapters

The GsonXxxAdapters were removed from the models Serialization classes
and replaced with type adapters from common.  Modified the code to refer
to the new adapters.
Without this fix, examples-onap-vcpe will not compile.  Could that be
the cause of the apex-pdp standalone issue, POLICY-3066?

Allow TypeAdapter in lieu of JsonSerializer/Deserializer adapters in
config files.
Note: examples-ona-bbs refers to the following, which were removed
several releases ago (during the actor re-write?):
- appclcm.util.Serialization$RequestAdapter & Serialization$ResponseAdapter

Issue-ID: POLICY-2905
Change-Id: Ia57e0346343614cbd4a1cffd9c8393f207284244
Signed-off-by: Jim Hahn <jrh3@att.com>

3 files changed, 78 insertions, 16 deletions

diff --git a/context/context-management/src/main/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperJsonAdapterParameters.java b/context/context-management/src/main/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperJsonAdapterParameters.java
index 49f2cbd49..0c68c42a1 100644
--- a/context/context-management/src/main/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperJsonAdapterParameters.java
+++ b/context/context-management/src/main/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperJsonAdapterParameters.java
@@ -1,19 +1,20 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
+ *  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.
  * 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.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
@@ -22,6 +23,7 @@ package org.onap.policy.apex.context.impl.schema.java;
 
 import com.google.gson.JsonDeserializer;
 import com.google.gson.JsonSerializer;
+import com.google.gson.TypeAdapter;
 import org.onap.policy.common.parameters.GroupValidationResult;
 import org.onap.policy.common.parameters.ParameterGroup;
 import org.onap.policy.common.parameters.ValidationStatus;
@@ -37,7 +39,7 @@ import org.slf4j.ext.XLoggerFactory;
  * <li>adaptedClass: The name of the class being adapted.
  * <li>adapterClass: the JSON adapter class to use for the adapted class.
  * </ol>
- * 
+ *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
 //@formatter:on
@@ -85,7 +87,7 @@ public class JavaSchemaHelperJsonAdapterParameters implements ParameterGroup {
         if (adaptedClass == null) {
             return null;
         }
-        
+
         try {
             return Class.forName(adaptedClass);
         } catch (final ClassNotFoundException e) {
@@ -121,7 +123,7 @@ public class JavaSchemaHelperJsonAdapterParameters implements ParameterGroup {
         if (adaptorClass == null) {
             return null;
         }
-        
+
         try {
             return Class.forName(adaptorClass);
         } catch (final ClassNotFoundException e) {
@@ -147,15 +149,20 @@ public class JavaSchemaHelperJsonAdapterParameters implements ParameterGroup {
         final GroupValidationResult result = new GroupValidationResult(this);
 
         getClass(ADAPTED_CLASS, adaptedClass, result);
-        
+
         Class<?> adaptorClazz = getClass(ADAPTOR_CLASS, adaptorClass, result);
+
         if (adaptorClazz != null) {
             String errorMessage = null;
-            
+
+            if (TypeAdapter.class.isAssignableFrom(adaptorClazz)) {
+                return result;
+            }
+
             if (!JsonSerializer.class.isAssignableFrom(adaptorClazz)) {
                 errorMessage = "class is not a JsonSerializer";
             }
-            
+
             if (!JsonDeserializer.class.isAssignableFrom(adaptorClazz)) {
                 if (errorMessage == null) {
                     errorMessage = "class is not a JsonDeserializer";
@@ -174,9 +181,9 @@ public class JavaSchemaHelperJsonAdapterParameters implements ParameterGroup {
 
     /**
      * Check a class exists.
-     * 
-     * @param parameterName the parameter name of the class to check for existence 
-     * @param classToCheck the class to check for existence 
+     *
+     * @param parameterName the parameter name of the class to check for existence
+     * @param classToCheck the class to check for existence
      * @param result the result of the check
      */
     private Class<?> getClass(String parameterName, String classToCheck, final GroupValidationResult result) {
@@ -184,7 +191,7 @@ public class JavaSchemaHelperJsonAdapterParameters implements ParameterGroup {
             result.setResult(parameterName, ValidationStatus.INVALID, "parameter is null or blank");
             return null;
         }
-        
+
         // Get the class for the event protocol
         try {
             return Class.forName(classToCheck);
diff --git a/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperParametersTest.java b/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperParametersTest.java
index 611eb7f25..65b2ed6ff 100644
--- a/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperParametersTest.java
+++ b/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/JavaSchemaHelperParametersTest.java
@@ -1,19 +1,20 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
+ *  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.
  * 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.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
@@ -72,6 +73,10 @@ public class JavaSchemaHelperParametersTest {
         jsonPars.setAdaptorClass("org.onap.policy.apex.context.impl.schema.java.SupportJsonAdapter");
         assertTrue(pars.validate().isValid());
 
+        jsonPars.setAdaptedClass("java.lang.String");
+        jsonPars.setAdaptorClass("org.onap.policy.apex.context.impl.schema.java.SupportJsonAdapter2");
+        assertTrue(pars.validate().isValid());
+
         Map<String, JavaSchemaHelperJsonAdapterParameters> adapterMap = new LinkedHashMap<>();
 
         pars.setJsonAdapters(adapterMap);
diff --git a/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/SupportJsonAdapter2.java b/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/SupportJsonAdapter2.java
new file mode 100644
index 000000000..627cde4c4
--- /dev/null
+++ b/context/context-management/src/test/java/org/onap/policy/apex/context/impl/schema/java/SupportJsonAdapter2.java
@@ -0,0 +1,50 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * 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.
+ * 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.policy.apex.context.impl.schema.java;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+
+public class SupportJsonAdapter2 extends TypeAdapter<String> {
+
+    @Override
+    public void write(JsonWriter out, String value) throws IOException {
+        if (value == null) {
+            out.nullValue();
+
+        } else {
+            out.value(value);
+        }
+    }
+
+    @Override
+    public String read(JsonReader in) throws IOException {
+        if (in.peek() == JsonToken.NULL) {
+            in.nextNull();
+            return null;
+        } else {
+            return in.nextString();
+        }
+    }
+}