OnlyOneExistsRule

Validation rule that checks that only one property of a list of properties exists in an object.

Implements: IValidationRule

Description

The OnlyOneExistsRule allows you to check that only one property of a list of properties exists in an object.

Constructors

Creates a new validation rule and sets its values.

public OnlyOneExistsRule(String… properties)

properties: String… - list of property names where only one property must exist

Instance methods

validate

Validates a given value against this rule.

public void validate(String path, Schema schema, Object value, List<ValidationResult> results)

path: string - dot notation path to the value.
schema: Schema - schema this rule is called from
value: any - value to be validated.
results: List<ValidationResult> - list with validation results.

Examples

{@code
  Schema schema = new Schema()
       .withRule(new OnlyOneExistsRule("field1", "field2"));
 
  schema.validate({ field1: 1, field2: "A" });     // Result: only one of properties field1, field2 must exist
  schema.validate({ field1: 1 });                  // Result: no errors
  schema.validate({ });                            // Result: only one of properties field1, field2 must exist
  }                            // Result: only one of properties field1, field2 must exist