FirstFailureValidator.java

package com.googlecode.totallylazy.validations;

import com.googlecode.totallylazy.predicates.Predicates;
import com.googlecode.totallylazy.Sequence;

import static com.googlecode.totallylazy.predicates.Predicates.not;
import static com.googlecode.totallylazy.Sequences.sequence;
import static com.googlecode.totallylazy.validations.ValidationResult.constructors.pass;
import static com.googlecode.totallylazy.validations.ValidationResult.functions.succeeded;
import static com.googlecode.totallylazy.validations.Validator.functions.validateAgainst;

public class FirstFailureValidator<T> extends LogicalValidator<T> {
    private final Sequence<Validator<? super T>> validators;

    public FirstFailureValidator(Sequence<Validator<? super T>> validators) {
        this.validators = validators;
    }

    @Override
    public ValidationResult validate(T instance) {
        return validators.map(validateAgainst(instance)).
                find(Predicates.not(succeeded())).
                getOrElse(pass());
    }

    public static class constructors {
        public static <T> FirstFailureValidator<T> firstFailure(Iterable<Validator<? super T>> validators) {
            return new FirstFailureValidator<T>(sequence(validators));
        }

    }
}