ReleephFieldSelector.php
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	<?php

	abstract class ReleephFieldSelector {

	final public function __construct() {
	// <empty>
	}

	abstract public function getFieldSpecifications();

	public function sortFieldsForCommitMessage(array $fields) {
	assert_instances_of($fields, 'ReleephFieldSpecification');
	return $fields;
	}

	protected static function selectFields(array $fields, array $classes) {
	assert_instances_of($fields, 'ReleephFieldSpecification');

	$map = array();
	foreach ($fields as $field) {
	$map[get_class($field)] = $field;
	}

	$result = array();
	foreach ($classes as $class) {
	$field = idx($map, $class);
	if (!$field) {
	throw new Exception(
	"Tried to select a in instance of '{$class}' but that field ".
	"is not configured for this project!");
	}

	if (idx($result, $class)) {
	throw new Exception(
	"You have asked to select the field '{$class}' ".
	"more than once!");
	}

	$result[$class] = $field;
	}

	return $result;
	}

	}