avoid creation of user-defined classes for aliases on java codegen languages.

Author: HugoMario

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java

@@ -374,17 +374,15 @@ public int compare(String o1, String o2) {
                     continue;
                 }
                 Map<String, Object> modelTemplate = (Map<String, Object>) ((List<Object>) models.get("models")).get(0);
-                /**
-                if (config instanceof AbstractJavaCodegen) {
+                if (isJavaCodegen(config.getName())) {
                     // Special handling of aliases only applies to Java
                     if (modelTemplate != null && modelTemplate.containsKey("model")) {
-                        CodegenModel m = (CodegenModel) modelTemplate.get("model");
-                        if (m.isAlias) {
+                        CodegenModel codegenModel = (CodegenModel) modelTemplate.get("model");
+                        if (ExtensionHelper.getBooleanValue(codegenModel, CodegenConstants.IS_ALIAS_EXT_NAME)) {
                             continue;  // Don't create user-defined classes for aliases
                         }
                     }
                 }
-                */
                 allModels.add(modelTemplate);
                 for (String templateName : config.modelTemplateFiles().keySet()) {
                     String suffix = config.modelTemplateFiles().get(templateName);
@@ -1014,4 +1012,9 @@ private com.github.jknack.handlebars.Template getHandlebars(String templateFile)
 
         return handlebars.compile(templateFile.replace(".mustache", StringUtils.EMPTY));
     }
+
+    private boolean isJavaCodegen(String name) {
+        return name.equalsIgnoreCase("java")
+                || name.equalsIgnoreCase("inflector");
+    }
 }