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<?php |
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namespace Pinq\Iterators\Common; |
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/** |
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* Contains the common functionality for the IOrderedMap implementation. |
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* |
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* @author Elliot Levin <[email protected]> |
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*/ |
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trait OrderedMap |
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{ |
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/** |
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* @var array |
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*/ |
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protected $keys = []; |
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/** |
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* @var array |
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*/ |
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protected $values = []; |
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/** |
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* @var array |
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*/ |
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protected $keyIdentityPositionMap = []; |
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/** |
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* @var int |
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*/ |
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protected $length = 0; |
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/** |
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* @var int |
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*/ |
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protected $largestIntKey = -1; |
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/** |
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* {@inheritDoc} |
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*/ |
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public function keys() |
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{ |
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return $this->keys; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function values() |
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{ |
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return $this->values; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function map(callable $function) |
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{ |
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$function = Functions::allowExcessiveArguments($function); |
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$clone = clone $this; |
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foreach ($clone->keyIdentityPositionMap as $position) { |
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$keyCopy = $this->keys[$position]; |
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$valueCopy = $this->values[$position]; |
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$clone->values[$position] = $function($valueCopy, $keyCopy); |
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} |
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return $clone; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function walk(callable $function) |
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{ |
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$function = Functions::allowExcessiveArguments($function); |
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foreach ($this->keys as $position => $key) { |
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$function($this->values[$position], $key); |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function groupBy(callable $groupKeyFunction) |
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{ |
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$groupedMap = new self(); |
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foreach ($this->keyIdentityPositionMap as $identityHash => $position) { |
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$keyCopy = $key = $this->keys[$position]; |
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$valueCopy = $value =& $this->values[$position]; |
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$groupKey = $groupKeyFunction($valueCopy, $keyCopy); |
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if ($groupedMap->contains($groupKey)) { |
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$groupMap = $groupedMap->get($groupKey); |
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} else { |
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$groupMap = new self(); |
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$groupedMap->set($groupKey, $groupMap); |
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} |
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$groupMap->setInternal($key, $value, $identityHash, true); |
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} |
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return $groupedMap; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function multisort(array $orderByFunctions, array $isAscending) |
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{ |
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$positionKeyIdentityMap = []; |
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$multisortArguments = []; |
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foreach ($this->keyIdentityPositionMap as $keyIdentityHash => $position) { |
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$positionKeyIdentityMap['0' . $position] = $keyIdentityHash; |
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} |
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foreach ($orderByFunctions as $key => $function) { |
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$orderByValues = []; |
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foreach ($this->keyIdentityPositionMap as $position) { |
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$orderByValues['0' . $position] = $function($this->values[$position], $this->keys[$position]); |
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} |
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$multisortArguments[] =& $orderByValues; |
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$multisortArguments[] = $isAscending[$key] ? SORT_ASC : SORT_DESC; |
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$multisortArguments[] = SORT_REGULAR; |
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unset($orderByValues); |
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} |
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$multisortArguments[] =& $positionKeyIdentityMap; |
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call_user_func_array('array_multisort', $multisortArguments); |
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$sortedMap = new self(); |
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$newPosition = 0; |
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foreach ($positionKeyIdentityMap as $stringPosition => $keyIdentityHash) { |
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$originalPosition = (int) $stringPosition; |
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$sortedMap->keyIdentityPositionMap[$keyIdentityHash] = $newPosition; |
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$sortedMap->keys[$newPosition] = $this->keys[$originalPosition]; |
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$sortedMap->values[$newPosition] =& $this->values[$originalPosition]; |
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$newPosition++; |
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} |
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return $sortedMap; |
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} |
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public function count() |
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{ |
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return $this->length; |
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} |
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private function loadLargestIntKey() |
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{ |
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$this->largestIntKey = -1; |
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foreach ($this->keys as $key) { |
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if (is_int($key) && $key > $this->largestIntKey) { |
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$this->largestIntKey = $key; |
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} |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function &get($key) |
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{ |
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$identityHash = Identity::hash($key); |
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if (isset($this->keyIdentityPositionMap[$identityHash])) { |
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return $this->values[$this->keyIdentityPositionMap[$identityHash]]; |
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} else { |
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$null = null; |
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return $null; |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function contains($key) |
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{ |
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return isset($this->keyIdentityPositionMap[Identity::hash($key)]); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function set($key, $value) |
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{ |
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$this->setInternal($key, $value, Identity::hash($key)); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function setRef($key, &$value) |
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{ |
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$this->setInternal($key, $value, Identity::hash($key), true); |
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} |
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final protected function setInternal($key, &$value, $identityHash, $reference = false) |
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{ |
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if (isset($this->keyIdentityPositionMap[$identityHash])) { |
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$position = $this->keyIdentityPositionMap[$identityHash]; |
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} else { |
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$position = $this->length++; |
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$this->keyIdentityPositionMap[$identityHash] = $position; |
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} |
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if (is_int($key) && $key > $this->largestIntKey) { |
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$this->largestIntKey = $key; |
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} |
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$this->keys[$position] = $key; |
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if ($reference) { |
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$this->values[$position] =& $value; |
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} else { |
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$this->values[$position] = $value; |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function remove($key) |
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{ |
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$identityHash = Identity::hash($key); |
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if (isset($this->keyIdentityPositionMap[$identityHash])) { |
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$position = $this->keyIdentityPositionMap[$identityHash]; |
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unset($this->keys[$position], |
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$this->values[$position], |
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$this->keyIdentityPositionMap[$identityHash]); |
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if ($position !== $this->length) { |
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$this->keys = array_values($this->keys); |
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$this->values = array_values($this->values); |
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} |
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$this->length--; |
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if ($key === $this->largestIntKey) { |
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$this->loadLargestIntKey(); |
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} |
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return true; |
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} |
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return false; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function clear() |
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{ |
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$this->keyIdentityPositionMap = []; |
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$this->keys = []; |
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$this->values = []; |
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$this->length = 0; |
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$this->largestIntKey = -1; |
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} |
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public function offsetExists($offset) |
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{ |
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return $this->contains($offset); |
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} |
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public function &offsetGet($offset) |
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{ |
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return $this->get($offset); |
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} |
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public function offsetSet($offset, $value) |
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{ |
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if ($offset === null) { |
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$offset = ++$this->largestIntKey; |
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} |
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$this->set($offset, $value); |
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} |
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public function offsetUnset($offset) |
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{ |
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return $this->remove($offset); |
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} |
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/** |
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* @return bool |
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*/ |
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final public function isArrayCompatible() |
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{ |
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return false; |
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} |
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} |
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