Customer operation unique id for springfox swagger lib

 when using swagger, each operation can have a id, by default this id is nickname of the annotation, for instance, 

@ApiOperation(value = "create a new user", nickname = "oper_code_create_new_user")

The oper_code_create_new_user will be used as unique id (not sure why the lib use nickname as a unique id but it does). How if you do not add this annotation on the method, for instance, you may have a parent Controller class, and the sub-Controller class just reuse the method without override it. in this case, the unique id will be oper_code_create_new_user_1 by default (as implementated in CachingOperationNameGenerator.java in springfox-spring-web library)

if you want to customize the unique id in the sub-class, for instance, I want to add the sub-class name or the value defined in controller lever tag name which is in @Api annotation, as the suffix,  you can reference below code sneppet.

@Component
@Order(SwaggerPluginSupport.SWAGGER_PLUGIN_ORDER + 1000)
public class OperationCustomizeUniqueIdReader implements OperationBuilderPlugin {

    @Override
    public void apply(OperationContext context) {
        Optional<ApiOperation> apiOperation = context.findAnnotation(ApiOperation.class);

        if (apiOperation.isPresent()) {
            Optional<Api> apiOptional = context.findControllerAnnotation(Api.class);
            if (apiOptional.isPresent()) {
                String tagName = apiOptional.get().tags()[0];
                ApiOperation operation = apiOperation.get();
                String nickname = operation.nickname();

                if (StringUtils.isNotEmpty(nickname) && StringUtils.isNotEmpty(tagName)) {
                    if (nickname.equalsIgnoreCase("oper_code_create_new_user") ) {
                        context.operationBuilder().uniqueId(nickname + "_" + tagName);
                        context.operationBuilder().codegenMethodNameStem(nickname + "_" + tagName);
                    }
                }
            }
        }
    }
    @Override
    public boolean supports(DocumentationType documentationType) {
        return SwaggerPluginSupport.pluginDoesApply(documentationType);
    }
}

if you have a sub class with @Api(tags = {"aSubResource"}), then you will get a unique name
for this method "oper_code_create_new_user_aSubResource"