1 <?php
2 /**
3 * Copyright 2012-2014 Rackspace US, Inc.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 namespace OpenCloud\Image\Resource\JsonPatch;
19
20 use OpenCloud\Image\Enum\Document as DocumentEnum;
21
22 /**
23 * Class that encodes a JSON document object into a flat string format
24 *
25 * @package OpenCloud\Images\Resource\JsonPatch
26 */
27 class Encoder
28 {
29 /** @var array Required transformations for reserved characters */
30 protected static $transformations = array(
31 '~' => '~0',
32 '/' => '~1'
33 );
34
35 /**
36 * Encode the
37 * @param array $operations
38 * @return string
39 */
40 public static function encode(array $operations)
41 {
42 $lines = array();
43
44 foreach ($operations as $operation) {
45 $lines[] = sprintf(
46 '{"%s": "%s", "%s": "%s", "%s": "%s"}',
47 DocumentEnum::OP, $operation->getType(),
48 DocumentEnum::PATH, $operation->getPath(),
49 DocumentEnum::VALUE, self::transform($operation->getValue())
50 );
51 }
52
53 return sprintf('[%s]', implode($lines, ','));
54 }
55
56 /**
57 * Search a given string and transform any reserved characters into their safe version
58 *
59 * @param $value
60 * @return string
61 */
62 public static function transform($value)
63 {
64 return strtr((string) $value, self::$transformations);
65 }
66 }
67