Custom.php

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<?php
/* Copyright (c) 2017 Stefan Hecken <stefan.hecken@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\Validation\Constraints;

use ILIAS\Validation\Constraint;
use ILIAS\Data;
use ILIAS\Data\Result;

class Custom implements Constraint
{
    protected $data_factory;

    protected $is_ok;

    protected $error;

    public function __construct(callable $is_ok, $error, Data\Factory $data_factory)
    {
        $this->is_ok = $is_ok;

        if (!is_callable($error)) {
            $this->error = function () use ($error) {
                return $error;
            };
        } else {
            $this->error = $error;
        }

        $this->data_factory = $data_factory;
    }

    final public function check($value)
    {
        if (!$this->accepts($value)) {
            throw new \UnexpectedValueException($this->getErrorMessage($value));
        }

        return null;
    }

    final public function accepts($value)
    {
        return call_user_func($this->is_ok, $value);
    }

    final public function problemWith($value)
    {
        if (!$this->accepts($value)) {
            return $this->getErrorMessage($value);
        }

        return null;
    }

    final public function restrict(Result $result)
    {
        if ($result->isError()) {
            return $result;
        }

        $problem = $this->problemWith($result->value());
        if ($problem !== null) {
            $error = $this->data_factory->error($problem);
            return $error;
        }

        return $result;
    }

    final public function withProblemBuilder(callable $builder)
    {
        $clone = clone $this;
        $clone->error = $builder;
        return $clone;
    }

    final public function getErrorMessage($value)
    {
        return call_user_func($this->error, $value);
    }
}