Data validator

Tests and linter status

Description

Data validator is a library that can be used to check the correctness of any data. To use a validator, you need to create a validator object and define a data validation scheme. The schema is an object that contains data validation rules.

Library Features:

• String validation:
  • null restriction;
  • minimum length limit;
  • content limit.
• Number validation:
  • null restriction;
  • sign limit;
  • allowable range.
• Validation of objects of type Map:
  • null restriction;
  • size limit;
  • structure check support.

Usage example

import hexlet.code.Validator;
import hexlet.code.schemas.StringSchema;
import hexlet.code.schemas.NumberSchema;
import hexlet.code.schemas.MapSchema;
import hexlet.code.schemas.BaseSchema;

Validator v = new Validator();

// Strings
StringSchema schema = v.string().required().minLength(5).contains("hex");
schema.isValid("hexlet"); // true
schema.isValid(""); // false

// Numbers
NumberSchema schema = v.number().required().positive().range(5, 10);
schema.isValid(-10); // false
schema.isValid(10); // true

// Map object with structure checking support
Map<String, BaseSchema> schemas = new HashMap<>();
schemas.put("name", v.string().required());
schemas.put("age", v.number().positive());

MapSchema schema = v.map().sizeof(2).shape(schemas);

Map<String, Object> human1 = new HashMap<>();
human1.put("name", "Kolya");
human1.put("age", 100);
schema.isValid(human1); // true

Map<String, Object> human2 = new HashMap<>();
human2.put("name", "");
human2.put("age", null);
schema.isValid(human1); // false