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<?php declare(strict_types=1); |
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namespace JSKOS; |
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use InvalidArgumentException; |
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/** |
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* Common base class of JSKOS Listing, Set, and LanguageMap. |
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*/ |
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abstract class Container extends PrettyJsonSerializable implements \Countable, \ArrayAccess, \IteratorAggregate |
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{ |
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protected $members = []; |
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protected $closed = true; |
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/** |
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* Check whether value can be added as member. |
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* |
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* @throws InvalidArgumentException if value is no JSKOS Resource |
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*/ |
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protected static function checkMember($value) |
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{ |
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if ($value instanceof Resource) { |
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return $value; |
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} else { |
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throw new InvalidArgumentException(get_called_class().' may only contain JSKOS Resources'); |
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} |
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} |
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/** |
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* Check whether an equal member alredy exists in this Container. |
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*/ |
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protected function findMember($member) |
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{ |
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return false; |
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} |
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/** |
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* Create a new container, possibly from an array. |
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*/ |
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public function __construct(array $members = []) |
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{ |
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foreach ($members as $m) { |
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if (is_null($m)) { |
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$this->closed = false; |
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} elseif (!$this->findMember($m)) { |
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$this->members[] = static::checkMember($m); |
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} |
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} |
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} |
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/** |
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* Apply a function to each member of this container. |
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* @param $callback callable |
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*/ |
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public function map(callable $callback): array |
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{ |
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$result = []; |
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foreach ($this->members as $member) { |
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$result[] = $callback($member); |
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} |
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return $result; |
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} |
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/** |
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* Return whether this container is empty (no members and closed). |
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*/ |
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public function isEmpty(): bool |
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{ |
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return $this->closed && !count($this->members); |
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} |
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/** |
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* Return whether this container is closed. |
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*/ |
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public function isClosed(): bool |
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{ |
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return $this->closed; |
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} |
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/** |
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* Set whether this container is closed (no unknown members) or not. |
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* @param Boolean $closed |
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*/ |
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public function setClosed(bool $closed = true) |
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{ |
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$this->closed = $closed; |
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} |
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# implements Countable |
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/** |
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* Return the number of known values in this container (closed or not). |
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*/ |
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public function count(): int |
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{ |
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return count($this->members); |
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} |
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# implements ArrayAccess: |
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/** |
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* Return whether an object exists at the given offset. |
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* @param mixed $offset |
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*/ |
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public function offsetExists($offset) |
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{ |
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return isset($this->members[$offset]); |
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} |
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/** |
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* Return an object at the given offset. |
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* @param mixed $offset |
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*/ |
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public function offsetGet($offset) |
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{ |
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return $this->members[$offset]; |
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} |
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/** |
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* Set an object at the given offset. |
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* @param mixed $offset |
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* @param mixed $object |
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*/ |
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public function offsetSet($offset, $object) |
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{ |
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if (is_int($offset) && $offset >= 0 && $offset < $this->count()) { |
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$member = static::checkMember($object); |
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# TODO: merge if duplicated |
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if (!$this->findMember($member)) { |
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$this->members[$offset] = $member; |
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} |
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} elseif (is_null($object)) { |
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$this->closed = false; |
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} else { |
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$this->append($object); |
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} |
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} |
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/** |
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* Append an object at the end. |
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*/ |
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public function append($object) |
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{ |
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$member = static::checkMember($object); |
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# TODO: merge if duplicated |
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if (!$this->findMember($member)) { |
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$this->members[] = $member; |
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} |
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} |
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/** |
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* @throws \BadMethodCallException |
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*/ |
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public function offsetUnset($key) |
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{ |
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throw new \BadMethodCallException(__METHOD__ . ' is not supported'); |
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} |
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# implements IteratorAggregate: |
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/** |
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* Return an iterator to iterate all members of the set. |
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*/ |
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public function getIterator() |
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{ |
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return new \ArrayIterator($this->members); |
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} |
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# extends PrettyJsonSerializable: |
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/** |
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* Return a data structure to serialize this container as JSON. |
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*/ |
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public function jsonLDSerialize(string $context=self::DEFAULT_CONTEXT) |
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{ |
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$set = array_map(function ($m) { |
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return is_object($m) ? $m->jsonLDSerialize('') : $m; |
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}, $this->members); |
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if (!$this->closed) { |
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$set[] = null; |
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} |
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return $set; |
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} |
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} |
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gbv /
jskos-php
