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| 1 | +<?php |
| 2 | +/** |
| 3 | + * Created by PhpStorm. |
| 4 | + * User: inhere |
| 5 | + * Date: 2017年04月26日 |
| 6 | + * Time: 9:18 |
| 7 | + */ |
| 8 | + |
| 9 | +namespace Toolkit\ArrUtil; |
| 10 | + |
| 11 | +/** |
| 12 | + * Class FixedArray |
| 13 | + * fixed size array implements, and support string key. |
| 14 | + * `SplFixedArray` only allow int key. |
| 15 | + * @package Toolkit\ArrUtil |
| 16 | + */ |
| 17 | +class FixedArray implements \ArrayAccess, \IteratorAggregate |
| 18 | +{ |
| 19 | + /** |
| 20 | + * @var array |
| 21 | + * [ |
| 22 | + * 'string:key' => 'int:value index' |
| 23 | + * ] |
| 24 | + */ |
| 25 | + protected $keys; |
| 26 | + |
| 27 | + /** |
| 28 | + * @var \SplFixedArray |
| 29 | + */ |
| 30 | + protected $values; |
| 31 | + |
| 32 | + /** |
| 33 | + * FixedArray constructor. |
| 34 | + * @param int $size |
| 35 | + */ |
| 36 | + public function __construct(int $size = 0) |
| 37 | + { |
| 38 | + $this->keys = []; |
| 39 | + $this->values = new \SplFixedArray($size); |
| 40 | + } |
| 41 | + |
| 42 | + /** |
| 43 | + * reset |
| 44 | + * @param int $size |
| 45 | + */ |
| 46 | + public function reset(int $size = 0) |
| 47 | + { |
| 48 | + $this->keys = []; |
| 49 | + $this->values = new \SplFixedArray($size); |
| 50 | + } |
| 51 | + |
| 52 | + /** |
| 53 | + * @param string $key |
| 54 | + * @return bool |
| 55 | + */ |
| 56 | + public function __isset(string $key) |
| 57 | + { |
| 58 | + return $this->offsetExists($key); |
| 59 | + } |
| 60 | + |
| 61 | + /** |
| 62 | + * @param string $key |
| 63 | + * @param mixed $value |
| 64 | + */ |
| 65 | + public function __set(string $key, $value) |
| 66 | + { |
| 67 | + $this->offsetSet($key, $value); |
| 68 | + } |
| 69 | + |
| 70 | + /** |
| 71 | + * @param string $key |
| 72 | + * @return mixed |
| 73 | + */ |
| 74 | + public function __get(string $key) |
| 75 | + { |
| 76 | + return $this->offsetGet($key); |
| 77 | + } |
| 78 | + |
| 79 | + /** |
| 80 | + * @return int |
| 81 | + */ |
| 82 | + public function getSize(): int |
| 83 | + { |
| 84 | + return $this->values->getSize(); |
| 85 | + } |
| 86 | + |
| 87 | + /** |
| 88 | + * @param $key |
| 89 | + * @return int |
| 90 | + */ |
| 91 | + public function getKeyIndex($key): int |
| 92 | + { |
| 93 | + return $this->keys[$key] ?? -1; |
| 94 | + } |
| 95 | + |
| 96 | + /** |
| 97 | + * @return array |
| 98 | + */ |
| 99 | + public function getKeys(): array |
| 100 | + { |
| 101 | + return $this->keys; |
| 102 | + } |
| 103 | + |
| 104 | + /** |
| 105 | + * @param array $keys |
| 106 | + */ |
| 107 | + public function setKeys(array $keys) |
| 108 | + { |
| 109 | + $this->keys = $keys; |
| 110 | + } |
| 111 | + |
| 112 | + /** |
| 113 | + * @return \SplFixedArray |
| 114 | + */ |
| 115 | + public function getValues(): \SplFixedArray |
| 116 | + { |
| 117 | + return $this->values; |
| 118 | + } |
| 119 | + |
| 120 | + /** |
| 121 | + * @param \SplFixedArray $values |
| 122 | + */ |
| 123 | + public function setValues(\SplFixedArray $values) |
| 124 | + { |
| 125 | + $this->values = $values; |
| 126 | + } |
| 127 | + |
| 128 | + /** |
| 129 | + * Defined by IteratorAggregate interface |
| 130 | + * Returns an iterator for this object, for use with foreach |
| 131 | + * @return \SplFixedArray |
| 132 | + */ |
| 133 | + public function getIterator(): \SplFixedArray |
| 134 | + { |
| 135 | + return $this->values; |
| 136 | + } |
| 137 | + |
| 138 | + /** |
| 139 | + * Checks whether an offset exists in the iterator. |
| 140 | + * @param mixed $offset The array offset. |
| 141 | + * @return boolean True if the offset exists, false otherwise. |
| 142 | + */ |
| 143 | + public function offsetExists($offset): bool |
| 144 | + { |
| 145 | + return isset($this->keys[$offset]); |
| 146 | + } |
| 147 | + |
| 148 | + /** |
| 149 | + * Gets an offset in the iterator. |
| 150 | + * @param mixed $offset The array offset. |
| 151 | + * @return mixed The array value if it exists, null otherwise. |
| 152 | + */ |
| 153 | + public function offsetGet($offset) |
| 154 | + { |
| 155 | + $index = $this->getKeyIndex($offset); |
| 156 | + |
| 157 | + if ($index >= 0) { |
| 158 | + return $this->values[$index]; |
| 159 | + } |
| 160 | + |
| 161 | + return null; |
| 162 | + } |
| 163 | + |
| 164 | + /** |
| 165 | + * Sets an offset in the iterator. |
| 166 | + * @param mixed $offset The array offset. |
| 167 | + * @param mixed $value The array value. |
| 168 | + * @return void |
| 169 | + */ |
| 170 | + public function offsetSet($offset, $value) |
| 171 | + { |
| 172 | + $index = $this->getSize(); |
| 173 | + |
| 174 | + // change size. |
| 175 | + if ($index <= \count($this->keys)) { |
| 176 | + $this->values->setSize($index + 10); |
| 177 | + } |
| 178 | + |
| 179 | + $this->values[$index] = $value; |
| 180 | + $this->keys[$offset] = $index; |
| 181 | + } |
| 182 | + |
| 183 | + /** |
| 184 | + * Unset an offset in the iterator. |
| 185 | + * @param mixed $offset The array offset. |
| 186 | + * @return void |
| 187 | + */ |
| 188 | + public function offsetUnset($offset) |
| 189 | + { |
| 190 | + $index = $this->getKeyIndex($offset); |
| 191 | + |
| 192 | + if ($index >= 0) { |
| 193 | + // change size. |
| 194 | + $this->values->setSize($index - 1); |
| 195 | + |
| 196 | + unset($this->keys[$offset], $this->values[$index]); |
| 197 | + } |
| 198 | + } |
| 199 | +} |
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