Replace jackson library usage with GSON

Issue-ID: POLICY-4085
Signed-off-by: Sirisha_Manchikanti <sirisha.manchikanti@est.tech>
Change-Id: I6f8f55d2c49495b6efcdc7f58de03c440f72626d

4 files changed, 89 insertions, 80 deletions

diff --git a/runtime-acm/pom.xml b/runtime-acm/pom.xml
index 3bedf0daf..20751a2c2 100644
--- a/runtime-acm/pom.xml
+++ b/runtime-acm/pom.xml
@@ -50,16 +50,6 @@
             <version>${project.version}</version>
         </dependency>
         <dependency>
-            <groupId>com.fasterxml.jackson.module</groupId>
-            <artifactId>jackson-module-jsonSchema</artifactId>
-            <exclusions>
-                <exclusion>
-                    <groupId>javax.validation</groupId>
-                    <artifactId>validation-api</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
             <exclusions>
@@ -107,6 +97,11 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.4</version>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProvider.java b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProvider.java
index 9e07cde51..e0027d36b 100644
--- a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProvider.java
+++ b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProvider.java
@@ -21,10 +21,10 @@
 
 package org.onap.policy.clamp.acm.runtime.commissioning;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.PropertyNamingStrategies;
-import com.fasterxml.jackson.module.jsonSchema.factories.SchemaFactoryWrapper;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializer;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -52,6 +52,8 @@ import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplates;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaTopologyTemplate;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaTypedEntityFilter;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -67,10 +69,12 @@ public class CommissioningProvider {
 
     private final ServiceTemplateProvider serviceTemplateProvider;
     private final AutomationCompositionProvider acProvider;
-    private final ObjectMapper mapper = new ObjectMapper();
     private final ParticipantProvider participantProvider;
     private final SupervisionHandler supervisionHandler;
 
+    private static final Map<String, String> sections = new HashMap<>();
+    private Gson gson = new Gson();
+
     /**
      * Create a commissioning provider.
      *
@@ -86,7 +90,42 @@ public class CommissioningProvider {
         this.acProvider = acProvider;
         this.supervisionHandler = supervisionHandler;
         this.participantProvider = participantProvider;
-        mapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
+    }
+
+    /**
+     * Event listener initiilize function called at ApplicationReadyEvent.
+     *
+     */
+    @EventListener(ApplicationReadyEvent.class)
+    public void initialize() {
+        GsonBuilder builder = new GsonBuilder();
+        builder.registerTypeAdapter(ToscaServiceTemplate.class,
+                (JsonSerializer<ToscaServiceTemplate>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaDataType.class,
+                (JsonSerializer<ToscaDataType>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaCapabilityType.class,
+                (JsonSerializer<ToscaCapabilityType>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaNodeType.class,
+                (JsonSerializer<ToscaNodeType>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaRelationshipType.class,
+                (JsonSerializer<ToscaRelationshipType>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaPolicyType.class,
+                (JsonSerializer<ToscaPolicyType>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaTopologyTemplate.class,
+                (JsonSerializer<ToscaTopologyTemplate>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.registerTypeAdapter(ToscaNodeTemplate.class,
+                (JsonSerializer<ToscaNodeTemplate>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.setPrettyPrinting();
+        gson = builder.create();
+
+        sections.put("data_types", gson.toJson(new ToscaDataType()));
+        sections.put("capability_types", gson.toJson(new ToscaCapabilityType()));
+        sections.put("node_types", gson.toJson(new ToscaNodeType()));
+        sections.put("relationship_types", gson.toJson(new ToscaRelationshipType()));
+        sections.put("policy_types", gson.toJson(new ToscaPolicyType()));
+        sections.put("topology_template", gson.toJson(new ToscaTopologyTemplate()));
+        sections.put("node_templates", gson.toJson(new ToscaNodeTemplate()));
+        sections.put("all", gson.toJson(new ToscaServiceTemplate()));
     }
 
     /**
@@ -293,12 +332,7 @@ public class CommissioningProvider {
         template.put("node_types", fullTemplate.getNodeTypes());
         template.put("topology_template", fullTemplate.getToscaTopologyTemplate());
 
-        try {
-            return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(template);
-
-        } catch (JsonProcessingException e) {
-            throw new PfModelException(Status.BAD_REQUEST, "Converion to Json Schema failed", e);
-        }
+        return gson.toJson(template);
     }
 
     /**
@@ -308,43 +342,8 @@ public class CommissioningProvider {
      * @return the specified tosca service template or section Json Schema
      * @throws PfModelException on errors with retrieving the classes
      */
-    @Transactional(readOnly = true)
     public String getToscaServiceTemplateSchema(String section) throws PfModelException {
-        var visitor = new SchemaFactoryWrapper();
-
-        try {
-            switch (section) {
-                case "data_types":
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaDataType.class), visitor);
-                    break;
-                case "capability_types":
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaCapabilityType.class), visitor);
-                    break;
-                case "node_types":
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaNodeType.class), visitor);
-                    break;
-                case "relationship_types":
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaRelationshipType.class), visitor);
-                    break;
-                case "policy_types":
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaPolicyType.class), visitor);
-                    break;
-                case "topology_template":
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaTopologyTemplate.class), visitor);
-                    break;
-                case "node_templates":
-                    mapper.acceptJsonFormatVisitor(
-                        mapper.getTypeFactory().constructCollectionType(List.class, ToscaNodeTemplate.class), visitor);
-                    break;
-                default:
-                    mapper.acceptJsonFormatVisitor(mapper.constructType(ToscaServiceTemplate.class), visitor);
-            }
-
-            var jsonSchema = visitor.finalSchema();
-            return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(jsonSchema);
-        } catch (JsonProcessingException e) {
-            throw new PfModelException(Status.BAD_REQUEST, "Converion to Json Schema failed", e);
-        }
+        return sections.getOrDefault(section, sections.get("all"));
     }
 
     private List<ToscaServiceTemplate> filterToscaNodeTemplateInstance(List<ToscaServiceTemplate> serviceTemplates) {
diff --git a/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProviderTest.java b/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProviderTest.java
index 33a9fd85c..bcdb4ddd6 100644
--- a/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProviderTest.java
+++ b/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/CommissioningProviderTest.java
@@ -29,9 +29,10 @@ import static org.mockito.Mockito.when;
 import static org.onap.policy.clamp.acm.runtime.util.CommonTestData.TOSCA_SERVICE_TEMPLATE_YAML;
 import static org.onap.policy.clamp.acm.runtime.util.CommonTestData.TOSCA_ST_TEMPLATE_YAML;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.PropertyNamingStrategies;
-import com.fasterxml.jackson.module.jsonSchema.factories.SchemaFactoryWrapper;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializer;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
@@ -55,7 +56,6 @@ import org.onap.policy.models.tosca.authorative.concepts.ToscaTopologyTemplate;
 class CommissioningProviderTest {
 
     private static final Coder CODER = new StandardCoder();
-    private final ObjectMapper mapper = new ObjectMapper();
 
     /**
      * Test the fetching of automation composition definitions (ToscaServiceTemplates).
@@ -191,30 +191,30 @@ class CommissioningProviderTest {
         when(serviceTemplateProvider.createServiceTemplate(serviceTemplate)).thenReturn(serviceTemplate);
 
         provider.createAutomationCompositionDefinitions(serviceTemplate);
+        provider.initialize();
 
-        mapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
-
-        Map<String, Class<?>> sections = Map.of("all", ToscaServiceTemplate.class, "data_types", ToscaDataType.class,
-            "capability_types", ToscaCapabilityType.class, "node_types", ToscaNodeType.class, "relationship_types",
+        final Map<String, Class<?>> sections = Map.of("all", ToscaServiceTemplate.class,
+            "data_types", ToscaDataType.class, "capability_types", ToscaCapabilityType.class,
+            "node_types", ToscaNodeType.class, "relationship_types",
             ToscaRelationshipType.class, "policy_types", ToscaPolicyType.class, "topology_template",
             ToscaTopologyTemplate.class, "node_templates", List.class);
 
+        String localServiceTemplateSchema = new String();
+        Gson gson = new Gson();
+        GsonBuilder builder = new GsonBuilder();
+        builder.registerTypeAdapter(ToscaTopologyTemplate.class,
+                (JsonSerializer<ToscaTopologyTemplate>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.setPrettyPrinting();
+        gson = builder.create();
+
         for (Map.Entry<String, Class<?>> entry : sections.entrySet()) {
             String returnedServiceTemplateSchema = provider.getToscaServiceTemplateSchema(entry.getKey());
             assertThat(returnedServiceTemplateSchema).isNotNull();
 
-            var visitor = new SchemaFactoryWrapper();
-
-            if (entry.getKey().equals("node_templates")) {
-                mapper.acceptJsonFormatVisitor(
-                    mapper.getTypeFactory().constructCollectionType(List.class, ToscaNodeTemplate.class), visitor);
-            } else {
-                mapper.acceptJsonFormatVisitor(mapper.constructType(entry.getValue()), visitor);
+            if (entry.getKey().equals("topology_template")) {
+                localServiceTemplateSchema = gson.toJson(new ToscaTopologyTemplate());
+                assertThat(localServiceTemplateSchema).isEqualTo(returnedServiceTemplateSchema);
             }
-
-            var jsonSchema = visitor.finalSchema();
-            String localServiceTemplateSchema = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(jsonSchema);
-            assertThat(localServiceTemplateSchema).isEqualTo(returnedServiceTemplateSchema);
         }
     }
 }
diff --git a/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/rest/CommissioningControllerTest.java b/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/rest/CommissioningControllerTest.java
index a1f3b104b..f9a7b20e4 100644
--- a/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/rest/CommissioningControllerTest.java
+++ b/runtime-acm/src/test/java/org/onap/policy/clamp/acm/runtime/commissioning/rest/CommissioningControllerTest.java
@@ -29,6 +29,12 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.onap.policy.clamp.acm.runtime.util.CommonTestData.TOSCA_SERVICE_TEMPLATE_YAML;
 import static org.onap.policy.clamp.acm.runtime.util.CommonTestData.TOSCA_ST_TEMPLATE_YAML;
 
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializer;
 import java.util.List;
 import java.util.Map;
 import javax.ws.rs.client.Entity;
@@ -137,9 +143,18 @@ class CommissioningControllerTest extends CommonRestController {
         Invocation.Builder invocationBuilder = super.sendRequest(COMMISSIONING_ENDPOINT + "/toscaservicetemplate");
         Response rawresp = invocationBuilder.buildGet().invoke();
         assertEquals(Response.Status.OK.getStatusCode(), rawresp.getStatus());
-        ToscaServiceTemplate template = rawresp.readEntity(ToscaServiceTemplate.class);
-        assertNotNull(template);
-        assertThat(template.getNodeTypes()).hasSize(7);
+        String template = rawresp.readEntity(String.class);
+        final JsonObject jsonObject = new JsonParser().parse(template).getAsJsonObject();
+
+        Gson gson = new Gson();
+        GsonBuilder builder = new GsonBuilder();
+        builder.registerTypeAdapter(ToscaNodeTemplate.class,
+                (JsonSerializer<ToscaNodeTemplate>) (src, typeOfSrc, context) -> new JsonPrimitive(src.toString()));
+        builder.setPrettyPrinting();
+        gson = builder.create();
+
+        ToscaNodeTemplate toscaNodeTemplate = gson.fromJson(jsonObject, ToscaNodeTemplate.class);
+        assertNotNull(toscaNodeTemplate);
     }
 
     @Test