Package org.apache.accumulo.core.util

Class Validator<T>

java.lang.Object

org.apache.accumulo.core.util.Validator<T>

All Implemented Interfaces:

Predicate<T>

public abstract class Validator<T>
extends Object
implements Predicate<T>

A class that validates arguments of a particular type. Implementations must implement Predicate.test(Object) and should override invalidMessage(Object).

Constructor Summary

Constructors

Constructor	Description
Validator()

Method Summary

Modifier and Type	Method	Description
Validator<T>	and(Validator<T> other)	Creates a new validator that is the conjunction of this one and the given one.
String	invalidMessage(T argument)	Formulates an exception message for invalid values.
Validator<T>	not()	Creates a new validator that is the negation of this one.
Validator<T>	or(Validator<T> other)	Creates a new validator that is the disjunction of this one and the given one.
T	validate(T argument)	Validates an argument.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.function.Predicate

and, negate, or, test

Constructor Detail

Validator

public Validator()

Method Detail

validate

public final T validate(T argument)

Validates an argument.

Parameters:

argument - argument to validate

Returns:

the argument, if validation passes

Throws:

IllegalArgumentException - if validation fails

invalidMessage

public String invalidMessage(T argument)

Formulates an exception message for invalid values.

Parameters:

argument - argument that failed validation

Returns:

exception message

and

public final Validator<T> and(Validator<T> other)

Creates a new validator that is the conjunction of this one and the given one. An argument passed to the returned validator is valid only if it passes both validators.

Parameters:

other - other validator

Returns:

combined validator

or

public final Validator<T> or(Validator<T> other)

Creates a new validator that is the disjunction of this one and the given one. An argument passed to the returned validator is valid only if it passes at least one of the validators.

Parameters:

other - other validator

Returns:

combined validator

not

public final Validator<T> not()

Creates a new validator that is the negation of this one. An argument passed to the returned validator is valid only if it fails this one.

Returns:

negated validator