how can I get the field defenitions of a datashape java sdk

I am writing a service to create a datashape, but before creating it, I want to verify if there is already a datashape with all the fields that the user want to create, so if there a way to get the field definitios of a datashape? my aproach is get the entty list of datashape, and then per each datashape verify all fields definitions and if they match return a error message that there is already a datashape with those fields