Merge pull request #705 from swagger-api/issue-466

handle content schema in parameter objects

Author: HugoMario

src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java

@@ -2414,8 +2414,11 @@ public CodegenParameter fromParameter(Parameter parameter, Set<String> imports)
             codegenParameter.vendorExtensions.putAll(parameter.getExtensions());
         }
 
-        if (parameter.getSchema() != null) {
-            Schema parameterSchema = parameter.getSchema();
+        Schema parameterSchema = parameter.getSchema();
+        if (parameterSchema == null) {
+            parameterSchema = getSchemaFromParameter(parameter);
+        }
+        if (parameterSchema != null) {
             String collectionFormat = null;
             if (parameterSchema instanceof ArraySchema) { // for array parameter
                 final ArraySchema arraySchema = (ArraySchema) parameterSchema;
@@ -3983,6 +3986,21 @@ protected Schema getSchemaFromResponse(ApiResponse response) {
         return schema;
     }
 
+    protected Schema getSchemaFromParameter(Parameter parameter) {
+        if (parameter.getContent() == null || parameter.getContent().isEmpty()) {
+            return null;
+        }
+        Schema schema = null;
+        for (String contentType : parameter.getContent().keySet()) {
+            schema = parameter.getContent().get(contentType).getSchema();
+            if (schema != null) {
+                schema.addExtension("x-content-type", contentType);
+            }
+            break;
+        }
+        return schema;
+    }
+
     protected Parameter getParameterFromRef(String ref, OpenAPI openAPI) {
         String parameterName = ref.substring(ref.lastIndexOf('/') + 1);
         Map<String, Parameter> parameterMap = openAPI.getComponents().getParameters();