Add XML support to the model generation

Author: sekikn

modules/openapi-generator/src/main/resources/Groovy/model.mustache

@@ -4,6 +4,9 @@ import groovy.transform.Canonical
 {{#imports}}
 import {{import}};
 {{/imports}}
+{{#withXml}}
+import {{javaxPackage}}.xml.bind.annotation.*;
+{{/withXml}}
 
 {{#models}}
 {{#model}}

modules/openapi-generator/src/main/resources/Groovy/modelClass.mustache

@@ -1,3 +1,6 @@
+{{#withXml}}
+@XmlAccessorType(XmlAccessType.NONE)
+{{/withXml}}
 @Canonical
 class {{classname}} {
 {{#vars}}
@@ -16,6 +19,12 @@ class {{classname}} {
 
     {{/isEnum}}
     {{#description}}/* {{{.}}} */{{/description}}
+    {{#withXml}}
+    @Xml{{#isXmlAttribute}}Attribute{{/isXmlAttribute}}{{^isXmlAttribute}}Element{{/isXmlAttribute}}(name = "{{items.xmlName}}{{^items.xmlName}}{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}{{/items.xmlName}}"{{#xmlNamespace}}, namespace = "{{.}}"{{/xmlNamespace}})
+        {{#isXmlWrapped}}
+    @XmlElementWrapper(name = "{{xmlName}}{{^xmlName}}{{baseName}}{{/xmlName}}"{{#xmlNamespace}}, namespace = "{{.}}"{{/xmlNamespace}})
+        {{/isXmlWrapped}}
+    {{/withXml}}
     {{{datatypeWithEnum}}} {{name}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}
 {{/vars}}
 }

modules/openapi-generator/src/main/resources/Groovy/modelEnum.mustache

@@ -1,10 +1,16 @@
+{{#withXml}}
+@XmlEnum
+{{/withXml}}
 enum {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} {
 {{#allowableValues}}{{#enumVars}}
     {{#enumDescription}}
         /**
         * {{.}}
         */
     {{/enumDescription}}
+    {{#withXml}}
+    @XmlEnumValue({{#isInteger}}"{{/isInteger}}{{#isDouble}}"{{/isDouble}}{{#isLong}}"{{/isLong}}{{#isFloat}}"{{/isFloat}}{{{value}}}{{#isInteger}}"{{/isInteger}}{{#isDouble}}"{{/isDouble}}{{#isLong}}"{{/isLong}}{{#isFloat}}"{{/isFloat}})
+    {{/withXml}}
     {{{name}}}({{{value}}}){{^-last}},
     {{/-last}}{{/enumVars}}{{/allowableValues}}