Reimplement Widget.Type enum class

Replace this with a WidgetType dynamic enumeration, which may be
extended at runtime. Load the Widget Types from the mapping
configuration (JSON file).

Issue-ID: AAI-2229
Change-Id: I5d1bc4291b4446f6d744821bf1d74b1f117b901f
Signed-off-by: mark.j.leonard <mark.j.leonard@gmail.com>

10 files changed, 141 insertions, 71 deletions

diff --git a/src/main/java/org/onap/aai/babel/parser/ArtifactGeneratorToscaParser.java b/src/main/java/org/onap/aai/babel/parser/ArtifactGeneratorToscaParser.java
index 6e37587..3f2e670 100644
--- a/src/main/java/org/onap/aai/babel/parser/ArtifactGeneratorToscaParser.java
+++ b/src/main/java/org/onap/aai/babel/parser/ArtifactGeneratorToscaParser.java
@@ -43,7 +43,7 @@ import org.onap.aai.babel.xml.generator.data.WidgetConfigurationUtil;
 import org.onap.aai.babel.xml.generator.model.Model;
 import org.onap.aai.babel.xml.generator.model.Resource;
 import org.onap.aai.babel.xml.generator.model.Widget;
-import org.onap.aai.babel.xml.generator.model.Widget.Type;
+import org.onap.aai.babel.xml.generator.model.WidgetType;
 import org.onap.aai.babel.xml.generator.types.ModelType;
 import org.onap.aai.cl.api.Logger;
 import org.onap.sdc.tosca.parser.api.ISdcCsarHelper;
@@ -191,7 +191,7 @@ public class ArtifactGeneratorToscaParser {
     }
 
     public Resource createInstanceGroupModel(Map<String, String> properties) {
-        Resource groupModel = new Resource(Type.INSTANCE_GROUP, true);
+        Resource groupModel = new Resource(WidgetType.valueOf("INSTANCE_GROUP"), true);
         groupModel.populateModelIdentificationInformation(properties);
         return groupModel;
     }
@@ -238,7 +238,7 @@ public class ArtifactGeneratorToscaParser {
         // Process each VF Group
         for (Group serviceGroup : serviceGroups) {
             Model groupModel = Model.getModelFor(serviceGroup.getType());
-            if (groupModel.getWidgetType() == Type.VFMODULE) {
+            if (groupModel.getWidgetType() == WidgetType.valueOf("VFMODULE")) {
                 processVfModule(resources, resourceModel, serviceGroup, serviceNode, (Resource) groupModel);
             }
         }
@@ -258,8 +258,8 @@ public class ArtifactGeneratorToscaParser {
             Resource model = Model.getModelFor(nodeTypeName, metaDataType);
 
             if (metadata != null && hasAllottedResource(metadata.getAllProperties())
-                    && model.getWidgetType() == Type.VSERVER) {
-                model = new Resource(Type.ALLOTTED_RESOURCE, false);
+                    && model.getWidgetType() == WidgetType.valueOf("VSERVER")) {
+                model = new Resource(WidgetType.valueOf("ALLOTTED_RESOURCE"), false);
                 Map<String, Object> props = new HashMap<>();
                 props.put("providingService", true);
                 model.setProperties(props);
@@ -268,7 +268,7 @@ public class ArtifactGeneratorToscaParser {
             foundProvidingService |= processModel(resourceModel, metadata, model, resourceNodeTemplate.getProperties());
         }
 
-        if (resourceModel.getWidgetType() == Type.ALLOTTED_RESOURCE && !foundProvidingService) {
+        if (resourceModel.getWidgetType() == WidgetType.valueOf("ALLOTTED_RESOURCE") && !foundProvidingService) {
             final String modelInvariantId = resourceModel.getModelId();
             throw new IllegalArgumentException(String.format(GENERATOR_AAI_PROVIDING_SERVICE_MISSING,
                     modelInvariantId == null ? "<null ID>" : modelInvariantId));
@@ -379,7 +379,7 @@ public class ArtifactGeneratorToscaParser {
 
         log.debug(member.getType() + " mapped to " + resource);
 
-        if (resource.getWidgetType() == Type.L3_NET) {
+        if (resource.getWidgetType() == WidgetType.valueOf("L3_NET")) {
             // An l3-network inside a vf-module is treated as a Widget
             resource.setModelType(ModelType.WIDGET);
         }
@@ -426,7 +426,7 @@ public class ArtifactGeneratorToscaParser {
         if (foundProvidingService) {
             processProvidingService(resourceModel, resourceNode, nodeProperties);
         } else if (resourceNode != null && resourceNode.getModelType() == ModelType.RESOURCE
-                && resourceNode.getWidgetType() != Widget.Type.L3_NET) {
+                && resourceNode.getWidgetType() != WidgetType.valueOf("L3_NET")) {
             if (metaData != null) {
                 resourceNode.populateModelIdentificationInformation(metaData.getAllProperties());
             }
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/api/AaiArtifactGenerator.java b/src/main/java/org/onap/aai/babel/xml/generator/api/AaiArtifactGenerator.java
index 52d342f..741c194 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/api/AaiArtifactGenerator.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/api/AaiArtifactGenerator.java
@@ -44,8 +44,8 @@ import org.onap.aai.babel.xml.generator.data.WidgetConfigurationUtil;
 import org.onap.aai.babel.xml.generator.model.Model;
 import org.onap.aai.babel.xml.generator.model.Resource;
 import org.onap.aai.babel.xml.generator.model.Service;
+import org.onap.aai.babel.xml.generator.model.WidgetType;
 import org.onap.aai.babel.xml.generator.model.Widget;
-import org.onap.aai.babel.xml.generator.model.Widget.Type;
 import org.onap.aai.babel.xml.generator.types.ModelType;
 import org.onap.aai.cl.api.Logger;
 import org.onap.sdc.tosca.parser.api.ISdcCsarHelper;
@@ -242,8 +242,8 @@ public class AaiArtifactGenerator implements ArtifactGenerator {
         if (model != null) {
             Metadata metadata = nodeTemplate.getMetaData();
             if (metadata != null && parser.hasAllottedResource(metadata.getAllProperties())
-                    && model.getWidgetType() == Type.VF) {
-                model = new Resource(Type.ALLOTTED_RESOURCE, true);
+                    && model.getWidgetType() == WidgetType.valueOf("VF")) {
+                model = new Resource(WidgetType.valueOf("ALLOTTED_RESOURCE"), true);
             }
         }
 
@@ -268,7 +268,7 @@ public class AaiArtifactGenerator implements ArtifactGenerator {
         }
 
         if (parser.hasSubCategoryTunnelXConnect(serviceMetadata) && parser.hasAllottedResource(serviceMetadata)) {
-            resourceModel.addWidget(Widget.getWidget(Type.TUNNEL_XCONNECT));
+            resourceModel.addWidget(Widget.getWidget(WidgetType.valueOf("TUNNEL_XCONNECT")));
         }
 
         resources.addAll(parser.processInstanceGroups(resourceModel, nodeTemplate));
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/data/GroupConfiguration.java b/src/main/java/org/onap/aai/babel/xml/generator/data/GroupConfiguration.java
index 9d6409b..7ecd3f2 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/data/GroupConfiguration.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/data/GroupConfiguration.java
@@ -2,8 +2,8 @@
  * ============LICENSE_START=======================================================
  * org.onap.aai
  * ================================================================================
- * Copyright © 2017-2019 AT&T Intellectual Property. All rights reserved.
- * Copyright © 2017-2019 European Software Marketing Ltd.
+ * Copyright (c) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (c) 2017-2019 European Software Marketing Ltd.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ public class GroupConfiguration {
     /**
      * Set of Widget Types.
      */
-    private List<WidgetType> widgetTypes;
+    private List<WidgetTypeConfig> widgetTypes;
 
     /**
      * Mapping from TOSCA type to Widget directly.
@@ -44,7 +44,7 @@ public class GroupConfiguration {
         return instanceGroupTypes;
     }
 
-    public List<WidgetType> getWidgetTypes() {
+    public List<WidgetTypeConfig> getWidgetTypes() {
         return widgetTypes;
     }
 
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetConfigurationUtil.java b/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetConfigurationUtil.java
index b340cd9..7683f7c 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetConfigurationUtil.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetConfigurationUtil.java
@@ -31,8 +31,8 @@ import java.util.Optional;
 import java.util.Properties;
 import org.onap.aai.babel.xml.generator.XmlArtifactGenerationException;
 import org.onap.aai.babel.xml.generator.model.Resource;
+import org.onap.aai.babel.xml.generator.model.WidgetType;
 import org.onap.aai.babel.xml.generator.model.Widget;
-import org.onap.aai.babel.xml.generator.model.Widget.Type;
 import org.onap.aai.babel.xml.generator.types.ModelType;
 
 public class WidgetConfigurationUtil {
@@ -69,8 +69,8 @@ public class WidgetConfigurationUtil {
         return Optional.ofNullable(typeToResource.get(typePrefix));
     }
 
-    public static Widget createWidgetFromType(Type type) throws XmlArtifactGenerationException {
-        Optional<Widget> widget = Optional.ofNullable(typeToWidget.get(type.toString()));
+    public static Widget createWidgetFromType(String widgetType) throws XmlArtifactGenerationException {
+        Optional<Widget> widget = Optional.ofNullable(typeToWidget.get(widgetType));
         if (widget.isPresent()) {
             // Make a copy of the Widget found in the mappings table.
             return new Widget(widget.get());
@@ -78,25 +78,26 @@ public class WidgetConfigurationUtil {
         return null;
     }
 
-    public static void setWidgetTypes(List<WidgetType> types) {
-        for (WidgetType type : types) {
+    public static void setWidgetTypes(List<WidgetTypeConfig> types) {
+        for (WidgetTypeConfig type : types) {
             if (type.type == null || type.name == null) {
                 throw new IllegalArgumentException("Incomplete widget type specified: " + type);
             }
-            Type widgetType = Widget.Type.valueOf(type.type);
+            WidgetType widgetType = new WidgetType(type.type);
             Widget widget = new Widget(widgetType, type.name, type.deleteFlag);
             typeToWidget.put(type.type, widget);
         }
+        WidgetType.validateElements();
     }
 
-    public static void setWidgetMappings(List<WidgetMapping> mappings) throws IOException {
+    public static void setWidgetMappings(List<WidgetMapping> mappings) throws IOException  {
         for (WidgetMapping mapping : mappings) {
             ModelType modelType = Optional.ofNullable(mapping.type).map(String::toUpperCase)
                     .map(s -> Enums.getIfPresent(ModelType.class, s).orNull()).orElse(null);
             if (mapping.prefix == null || mapping.widget == null || modelType == null) {
                 throw new IOException("Invalid widget mapping specified: " + mapping);
             }
-            Resource resource = new Resource(Widget.Type.valueOf(mapping.widget), mapping.deleteFlag);
+            Resource resource = new Resource(WidgetType.valueOf(mapping.widget), mapping.deleteFlag);
             resource.setModelType(modelType);
             typeToResource.put(mapping.prefix, resource);
         }
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetType.java b/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetTypeConfig.java
index 7691f0f..0d0fe6b 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetType.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/data/WidgetTypeConfig.java
@@ -2,8 +2,8 @@
  * ============LICENSE_START=======================================================
  * org.onap.aai
  * ================================================================================
- * Copyright © 2017-2019 AT&T Intellectual Property. All rights reserved.
- * Copyright © 2017-2019 European Software Marketing Ltd.
+ * Copyright (c) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (c) 2017-2019 European Software Marketing Ltd.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,7 +21,11 @@
 
 package org.onap.aai.babel.xml.generator.data;
 
-public class WidgetType {
+/**
+ * Widget Type as configured in the TOSCA Mappings. 
+ *
+ */
+public class WidgetTypeConfig {
 
     String type;
     String name;
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/model/Model.java b/src/main/java/org/onap/aai/babel/xml/generator/model/Model.java
index 12f1ac8..ea1d478 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/model/Model.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/model/Model.java
@@ -30,7 +30,6 @@ import java.util.Optional;
 import java.util.Set;
 import org.onap.aai.babel.xml.generator.XmlArtifactGenerationException;
 import org.onap.aai.babel.xml.generator.data.WidgetConfigurationUtil;
-import org.onap.aai.babel.xml.generator.model.Widget.Type;
 
 public abstract class Model {
 
@@ -148,9 +147,9 @@ public abstract class Model {
      */
     public static Resource getModelFor(String toscaType, String metaDataType) {
         if ("Configuration".equals(metaDataType)) {
-            return new Resource(Type.CONFIGURATION, true);
+            return new Resource(WidgetType.valueOf("CONFIGURATION"), true);
         } else if ("CR".equals(metaDataType)) {
-            return new Resource(Type.CR, true);
+            return new Resource(WidgetType.valueOf("CR"), true);
         } else {
             return getModelFor(toscaType);
         }
@@ -158,7 +157,7 @@ public abstract class Model {
 
     public abstract boolean addWidget(Widget resource) throws XmlArtifactGenerationException;
 
-    public abstract Widget.Type getWidgetType();
+    public abstract WidgetType getWidgetType();
 
     public abstract String getModelTypeName();
 
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/model/Resource.java b/src/main/java/org/onap/aai/babel/xml/generator/model/Resource.java
index 911bf32..f5f7c50 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/model/Resource.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/model/Resource.java
@@ -25,12 +25,11 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import org.onap.aai.babel.xml.generator.XmlArtifactGenerationException;
-import org.onap.aai.babel.xml.generator.model.Widget.Type;
 import org.onap.aai.babel.xml.generator.types.ModelType;
 
 public class Resource extends Model {
-  
-    private Type type;
+
+    private WidgetType type;
     private boolean deleteFlag;
     private ModelType modelType = ModelType.RESOURCE;
     private Map<String, Object> properties = Collections.emptyMap();
@@ -40,7 +39,7 @@ public class Resource extends Model {
     boolean addvolume = false;
     List<String> members;
 
-    public Resource(Type type, boolean deleteFlag) {
+    public Resource(WidgetType type, boolean deleteFlag) {
         this.type = type;
         this.deleteFlag = deleteFlag;
     }
@@ -71,15 +70,15 @@ public class Resource extends Model {
     public Map<String, Object> getProperties() {
         return properties;
     }
-    
+
     public void setModelType(ModelType type) {
         this.modelType = type;
     }
-    
+
     public ModelType getModelType() {
         return modelType;
     }
-    
+
     public void setMembers(List<String> members) {
         this.members = members;
     }
@@ -88,23 +87,23 @@ public class Resource extends Model {
      * Adds a Widget.
      *
      * @param widget
-     *     the widget
+     *            the widget
      * @return the boolean
-     * @throws XmlArtifactGenerationException 
+     * @throws XmlArtifactGenerationException
      */
     @Override
     public boolean addWidget(Widget widget) throws XmlArtifactGenerationException {
-        if (type == Type.VFMODULE) {
+        if (type == WidgetType.valueOf("VFMODULE")) {
             if (widget.memberOf(members)) {
-                if (vserver == null && widget.getWidgetType() == Type.VSERVER) {
+                if (vserver == null && widget.getWidgetType() == WidgetType.valueOf("VSERVER")) {
                     addVserverWidget(widget);
-                } else if (widget.getWidgetType() == Type.LINT) {
+                } else if (widget.getWidgetType() == WidgetType.valueOf("LINT")) {
                     return addLIntfWidget(widget);
-                } else if (widget.getWidgetType() == Type.VOLUME) {
+                } else if (widget.getWidgetType() == WidgetType.valueOf("VOLUME")) {
                     addVolumeWidget(widget);
                     return true;
                 }
-                if (widget.getWidgetType() != Type.OAM_NETWORK) {
+                if (widget.getWidgetType() != WidgetType.valueOf("OAM_NETWORK")) {
                     return widgets.add(widget);
                 }
             }
@@ -113,11 +112,11 @@ public class Resource extends Model {
             return widgets.add(widget);
         }
     }
-    
-    public Type getWidgetType() {
+
+    public WidgetType getWidgetType() {
         return type;
     }
-    
+
     public String getModelTypeName() {
         return "resource";
     }
@@ -154,10 +153,10 @@ public class Resource extends Model {
     private void addVserverWidget(Widget widget) throws XmlArtifactGenerationException {
         vserver = widget;
         if (addlintf) {
-            vserver.addWidget(Widget.getWidget(Type.LINT));
+            vserver.addWidget(Widget.getWidget(WidgetType.valueOf("LINT")));
         }
         if (addvolume) {
-            vserver.addWidget(Widget.getWidget(Type.VOLUME));
+            vserver.addWidget(Widget.getWidget(WidgetType.valueOf("VOLUME")));
         }
     }
 
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/model/Service.java b/src/main/java/org/onap/aai/babel/xml/generator/model/Service.java
index 6c96e96..0d20c2d 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/model/Service.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/model/Service.java
@@ -21,8 +21,6 @@
 
 package org.onap.aai.babel.xml.generator.model;
 
-import org.onap.aai.babel.xml.generator.model.Widget.Type;
-
 public class Service extends Model {
 
     @Override
@@ -31,8 +29,8 @@ public class Service extends Model {
     }
 
     @Override
-    public Widget.Type getWidgetType() {
-        return Type.SERVICE;
+    public WidgetType getWidgetType() {
+        return WidgetType.valueOf("SERVICE");
     }
 
     public String getModelTypeName() {
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/model/Widget.java b/src/main/java/org/onap/aai/babel/xml/generator/model/Widget.java
index 2decc8c..732ec4d 100644
--- a/src/main/java/org/onap/aai/babel/xml/generator/model/Widget.java
+++ b/src/main/java/org/onap/aai/babel/xml/generator/model/Widget.java
@@ -37,17 +37,13 @@ public class Widget extends Model {
     public static final String GENERATOR_AAI_CONFIGLPROP_NOT_FOUND =
             "Cannot generate artifacts. Widget configuration not found for %s";
 
-    public enum Type {
-        SERVICE, VF, VFC, VSERVER, VOLUME, FLAVOR, TENANT, VOLUME_GROUP, LINT, L3_NET, VFMODULE, IMAGE, OAM_NETWORK, ALLOTTED_RESOURCE, TUNNEL_XCONNECT, CONFIGURATION, CR, INSTANCE_GROUP;
-    }
-
     private Set<String> keys = new HashSet<>();
 
     protected String name;
-    protected Type type;
+    protected WidgetType type;
     protected boolean deleteFlag = false;
 
-    public Widget(Type widgetType, String name, boolean deleteFlag) {
+    public Widget(WidgetType widgetType, String name, boolean deleteFlag) {
         type = widgetType;
         this.name = name;
         this.deleteFlag = deleteFlag;
@@ -61,25 +57,25 @@ public class Widget extends Model {
      */
     public Widget(Widget baseWidget) throws XmlArtifactGenerationException {
         this(baseWidget.getWidgetType(), baseWidget.getName(), baseWidget.getDeleteFlag());
-        if (type == Type.VSERVER) {
-            widgets.add(getWidget(Type.FLAVOR));
-            widgets.add(getWidget(Type.IMAGE));
-            widgets.add(getWidget(Type.TENANT));
-            widgets.add(getWidget(Type.VFC));
+        if (type == WidgetType.valueOf("VSERVER")) {
+            widgets.add(getWidget(WidgetType.valueOf("FLAVOR")));
+            widgets.add(getWidget(WidgetType.valueOf("IMAGE")));
+            widgets.add(getWidget(WidgetType.valueOf("TENANT")));
+            widgets.add(getWidget(WidgetType.valueOf("VFC")));
         }
     }
 
     /**
      * Gets widget.
      *
-     * @param type
-     *            the type
+     * @param typeString
+     * 
      * @return a new widget of the specified type
      * @throws XmlArtifactGenerationException
      *             if there is no configuration defined for the specified type
      */
-    public static Widget getWidget(Type type) throws XmlArtifactGenerationException {
-        Widget widget = WidgetConfigurationUtil.createWidgetFromType(type);
+    public static Widget getWidget(WidgetType type) throws XmlArtifactGenerationException {
+        Widget widget = WidgetConfigurationUtil.createWidgetFromType(type.toString());
         if (widget == null) {
             throw new XmlArtifactGenerationException("No widget type is defined for " + type);
         }
@@ -126,7 +122,7 @@ public class Widget extends Model {
     }
 
     @Override
-    public Type getWidgetType() {
+    public WidgetType getWidgetType() {
         return type;
     }
 
@@ -175,7 +171,7 @@ public class Widget extends Model {
 
     @Override
     public boolean addWidget(Widget widget) {
-        if (getWidgetType() == Type.VSERVER) {
+        if (getWidgetType() == WidgetType.valueOf("VSERVER")) {
             return widgets.add(widget);
         }
         return true;
diff --git a/src/main/java/org/onap/aai/babel/xml/generator/model/WidgetType.java b/src/main/java/org/onap/aai/babel/xml/generator/model/WidgetType.java
new file mode 100644
index 0000000..2cab6ae
--- /dev/null
+++ b/src/main/java/org/onap/aai/babel/xml/generator/model/WidgetType.java
@@ -0,0 +1,73 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright (c) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (c) 2017-2019 European Software Marketing Ltd.
+ * ================================================================================
+ * 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.aai.babel.xml.generator.model;
+
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Widget Type Enumeration.
+ *
+ */
+public class WidgetType {
+
+    /**
+     * Dynamically created set of Widget Types.
+     */
+    private static Map<String, WidgetType> elements = new LinkedHashMap<>();
+
+    /**
+     * Types that must be present for Model generation to function correctly.
+     */
+    private static final List<String> mandatoryElements = Arrays.asList( //
+            "SERVICE", "VF", "VFC", "VSERVER", "VOLUME", "FLAVOR", "TENANT", "VOLUME_GROUP", "LINT", "L3_NET",
+            "VFMODULE", "IMAGE", "OAM_NETWORK", "ALLOTTED_RESOURCE", "TUNNEL_XCONNECT", "CONFIGURATION", "CR",
+            "INSTANCE_GROUP");
+
+    private final String name;
+
+    public WidgetType(String name) {
+        this.name = name;
+        elements.put(name, this);
+    }
+
+    public static void validateElements() {
+        mandatoryElements.forEach(WidgetType::valueOf);
+    }
+
+    public static WidgetType valueOf(String typeName) {
+        WidgetType type = elements.get(typeName);
+        if (type == null) {
+            throw new IllegalArgumentException("Unknown type " + typeName);
+        }
+        return type;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+
+}
+