testing

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;
			}

			}