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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * @author: Doug Wilbourne (dougwilbourne@gmail.com) |
| 5 | */ |
| 6 | |
| 7 | declare(strict_types=1); |
| 8 | |
| 9 | namespace pvc\struct\collection; |
| 10 | |
| 11 | use ArrayIterator; |
| 12 | use IteratorIterator; |
| 13 | use pvc\interfaces\struct\collection\CollectionInterface; |
| 14 | use pvc\struct\collection\err\DuplicateKeyException; |
| 15 | use pvc\struct\collection\err\InvalidKeyException; |
| 16 | use pvc\struct\collection\err\NonExistentKeyException; |
| 17 | |
| 18 | /** |
| 19 | * Class Collection |
| 20 | * @template ElementType |
| 21 | * @extends IteratorIterator<non-negative-int, ElementType, ArrayIterator> |
| 22 | * @implements CollectionInterface<ElementType> |
| 23 | * |
| 24 | * elements in a collection cannot be null |
| 25 | */ |
| 26 | class Collection extends IteratorIterator implements CollectionInterface |
| 27 | { |
| 28 | /** |
| 29 | * @var ArrayIterator<int, ElementType> |
| 30 | */ |
| 31 | protected ArrayIterator $iterator; |
| 32 | |
| 33 | /** |
| 34 | * @var callable(ElementType, ElementType):int|null |
| 35 | * used by getElements to return the elements in whatever sort order you choose |
| 36 | */ |
| 37 | protected $comparator = null; |
| 38 | |
| 39 | /** |
| 40 | * @param array<non-negative-int, ElementType> $elements |
| 41 | * @param callable(ElementType, ElementType):int|null $comparator |
| 42 | */ |
| 43 | public function __construct(array $elements = [], callable|null $comparator = null) |
| 44 | { |
| 45 | $this->iterator = new ArrayIterator($elements); |
| 46 | $this->comparator = $comparator; |
| 47 | parent::__construct($this->iterator); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * count |
| 52 | * @return non-negative-int |
| 53 | */ |
| 54 | public function count(): int |
| 55 | { |
| 56 | return $this->iterator->count(); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * isEmpty returns whether the collection is empty or not |
| 61 | * @return bool |
| 62 | */ |
| 63 | public function isEmpty(): bool |
| 64 | { |
| 65 | return (0 == $this->count()); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * validateKey encapsulates the logic that all keys must be non-negative integers |
| 70 | * @param int $key |
| 71 | * @return bool |
| 72 | */ |
| 73 | protected function validateKey(int $key): bool |
| 74 | { |
| 75 | return $key >= 0; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * validateExistingKey ensures that the key is both valid and exists in the collection |
| 80 | * @param int $key |
| 81 | * @throws InvalidKeyException |
| 82 | * @throws NonExistentKeyException |
| 83 | */ |
| 84 | public function validateExistingKey(int $key): bool |
| 85 | { |
| 86 | return $this->iterator->offsetExists($key); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * validateNewKey ensures that the key does not exist in the collection |
| 91 | * @param int $key |
| 92 | */ |
| 93 | public function validateNewKey(int $key): bool |
| 94 | { |
| 95 | return !$this->iterator->offsetExists($key); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * getElement |
| 100 | * @param non-negative-int $key |
| 101 | * @return ElementType |
| 102 | */ |
| 103 | public function getElement(int $key): mixed |
| 104 | { |
| 105 | if (!$this->validateKey($key)) { |
| 106 | throw new InvalidKeyException($key); |
| 107 | } |
| 108 | if (!$this->validateExistingKey($key)) { |
| 109 | throw new NonExistentKeyException($key); |
| 110 | } |
| 111 | /** |
| 112 | * element cannot be null |
| 113 | */ |
| 114 | $element = $this->iterator->offsetGet($key); |
| 115 | assert(!is_null($element)); |
| 116 | return $element; |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * now implement methods explicitly defined in the interface |
| 121 | */ |
| 122 | |
| 123 | /** |
| 124 | * @function getElements |
| 125 | * @return array<ElementType> |
| 126 | */ |
| 127 | public function getElements(): array |
| 128 | { |
| 129 | if ($this->comparator) { |
| 130 | $this->iterator->uasort($this->comparator); |
| 131 | } |
| 132 | return iterator_to_array($this->iterator); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * @function getKey |
| 137 | * @param ElementType $element |
| 138 | * @param bool $strict |
| 139 | * @return non-negative-int|false |
| 140 | */ |
| 141 | public function getKey($element, bool $strict = true): int|false |
| 142 | { |
| 143 | $key = array_search($element, $this->getElements(), $strict); |
| 144 | assert((is_int($key) && ($key >= 0)) || $key === false); |
| 145 | return $key; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * getKeys returns all the keys in the collection where the corresponding element equals $element. |
| 150 | * |
| 151 | * @param ElementType $element |
| 152 | * @param bool $strict |
| 153 | * @return array<non-negative-int> |
| 154 | */ |
| 155 | public function getKeys($element, bool $strict = true): array |
| 156 | { |
| 157 | /** @var array<non-negative-int> $keys */ |
| 158 | $keys = array_keys($this->getElements(), $element, $strict); |
| 159 | return $keys; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * add |
| 164 | * |
| 165 | * Unlike when you are dealing with a raw array, using an existing key will throw an exception instead |
| 166 | * of overwriting an existing entry in the array. Use update to be explicit about updating an entry. |
| 167 | * |
| 168 | * @param non-negative-int $key |
| 169 | * @param ElementType $element |
| 170 | * @throws DuplicateKeyException |
| 171 | * @throws InvalidKeyException |
| 172 | */ |
| 173 | public function add(int $key, $element): void |
| 174 | { |
| 175 | if (!$this->validateKey($key)) { |
| 176 | throw new InvalidKeyException($key); |
| 177 | } |
| 178 | if (!$this->validateNewKey($key)) { |
| 179 | throw new DuplicateKeyException($key); |
| 180 | } |
| 181 | $this->iterator->offsetSet($key, $element); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * update assigns a new element to the entry with index $key |
| 186 | * |
| 187 | * @param non-negative-int $key |
| 188 | * @param ElementType $element |
| 189 | * @throws InvalidKeyException |
| 190 | * @throws NonExistentKeyException |
| 191 | */ |
| 192 | public function update(int $key, $element): void |
| 193 | { |
| 194 | if (!$this->validateKey($key)) { |
| 195 | throw new InvalidKeyException($key); |
| 196 | } |
| 197 | if (!$this->validateExistingKey($key)) { |
| 198 | throw new NonExistentKeyException($key); |
| 199 | } |
| 200 | $this->iterator->offsetSet($key, $element); |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * delete removes an element from the collection. Unlike unset, this operation throws an exception if the |
| 205 | * key does not exist. |
| 206 | * |
| 207 | * @param non-negative-int $key |
| 208 | * @return void |
| 209 | * @throws InvalidKeyException |
| 210 | * @throws NonExistentKeyException |
| 211 | */ |
| 212 | public function delete(int $key): void |
| 213 | { |
| 214 | if (!$this->validateKey($key)) { |
| 215 | throw new InvalidKeyException($key); |
| 216 | } |
| 217 | if (!$this->validateExistingKey($key)) { |
| 218 | throw new NonExistentKeyException($key); |
| 219 | } |
| 220 | $this->iterator->offsetUnset($key); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * @param int $key |
| 225 | * @return int |
| 226 | */ |
| 227 | public function getIndex(int $key): int |
| 228 | { |
| 229 | return -1; |
| 230 | } |
| 231 | |
| 232 | public function setIndex(int $key, int $newIndex): void |
| 233 | { |
| 234 | } |
| 235 | } |