61 lines
2.1 KiB
PHP
61 lines
2.1 KiB
PHP
<?php
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/**
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* Copyright 2015 OpenStack Foundation
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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namespace utils;
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/**
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* Class OrderParser
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* @package utils
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*/
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final class OrderParser
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{
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/**
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* @param string $orders
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* @param array $allowed_fields
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* @return Order
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* @throws OrderParserException
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*/
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public static function parse($orders, $allowed_fields = [])
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{
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$res = [];
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$orders = explode(',', trim($orders));
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//default ordering is asc
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foreach($orders as $field)
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{
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$element = null;
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if(strpos($field, '+') === 0)
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{
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$field = trim($field,'+');
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if(!in_array($field, $allowed_fields))
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throw new OrderParserException(sprintf("order by field %s is not allowed", $field));
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$element = OrderElement::buildAscFor($field);
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}
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else if(strpos($field, '-') === 0)
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{
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$field = trim($field,'-');
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if(!in_array($field, $allowed_fields))
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throw new OrderParserException(sprintf("order by field %s is not allowed", $field));
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$element = OrderElement::buildDescFor($field);
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}
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else
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{
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if(!in_array($field, $allowed_fields))
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throw new OrderParserException(sprintf("order by field %s is not allowed", $field));
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$element = OrderElement::buildAscFor($field);
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}
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array_push($res, $element);
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}
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return new Order($res);
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}
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} |