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<?php |
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namespace itertools; |
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use InvalidArgumentException; |
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use IteratorIterator; |
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/** |
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* Maps iterator values using a callback function but in batches. |
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*/ |
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class BatchMapIterator extends IteratorIterator |
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{ |
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const DONT_SPLIT_KEY_VALUES = 0; |
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const SPLIT_KEY_VALUES = 1; |
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const DONT_ADD_KEY_LIST = 0; |
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const ADD_KEY_LIST = 2; |
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const ALLOW_MERGE = 0; |
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const DONT_ALLOW_MERGE = 4; |
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protected $mapCallbacks; |
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protected $type; |
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protected $batchSize; |
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protected $batch; |
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protected $batchKeys; |
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public function __construct($innerItererator, $mapCallback, $batchSize = 100, $type = 0) |
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{ |
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if (! is_callable($mapCallback)) { |
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throw new InvalidArgumentException('The callback must be callable'); |
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} |
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if(($type & self::DONT_ALLOW_MERGE) == 0 && $innerItererator instanceof self && $batchSize == $innerItererator->getBatchSize() && $type == $innerItererator->getType()) { |
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parent::__construct(IterUtil::asTraversable($innerItererator->getInnerIterator())); |
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$this->mapCallbacks = array_merge($innerItererator->getMapCallbacks(), array($mapCallback)); |
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} else { |
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parent::__construct(IterUtil::asTraversable($innerItererator)); |
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$this->mapCallbacks = array($mapCallback); |
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} |
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$this->type = $type; |
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$this->batchSize = $batchSize; |
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} |
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public function getType() |
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{ |
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return $this->type; |
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} |
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public function getMapCallbacks() |
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{ |
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return $this->mapCallbacks; |
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} |
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public function getBatchSize() |
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{ |
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return $this->batchSize; |
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} |
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protected function ensureBatchPresent() |
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{ |
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$batch = array(); |
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$batchKeys = array(); |
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$inner = $this->getInnerIterator(); |
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if(self::SPLIT_KEY_VALUES & $this->type) { |
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for($i = 0; $i < $this->batchSize && $inner->valid(); $i++, $inner->next()) { |
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$batch[] = array($inner->key(), $inner->current()); |
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} |
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} else { |
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for($i = 0; $i < $this->batchSize && $inner->valid(); $i++, $inner->next()) { |
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$batch[] = $inner->current(); |
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$batchKeys[] = $inner->key(); |
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} |
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} |
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if((self::ADD_KEY_LIST & $this->type) != 0) { |
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foreach($this->mapCallbacks as $mapCallback) { |
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list($batchKeys, $batch) = call_user_func($mapCallback, $batchKeys, $batch); |
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} |
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} else { |
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foreach($this->mapCallbacks as $mapCallback) { |
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$batch = call_user_func($mapCallback, $batch); |
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} |
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} |
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$this->batch = $batch; |
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reset($this->batch); |
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$this->batchKeys = $batchKeys; |
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reset($this->batchKeys); |
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} |
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public function rewind() |
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{ |
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$this->getInnerIterator()->rewind(); |
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$this->batch = array(); |
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$this->batchKeys = array(); |
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} |
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public function valid() |
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{ |
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while(null === key($this->batch) && $this->getInnerIterator()->valid()) { |
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$this->ensureBatchPresent(); |
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} |
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return null !== key($this->batch); |
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} |
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public function next() |
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{ |
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next($this->batch); |
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next($this->batchKeys); |
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} |
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public function key() |
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{ |
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if(self::SPLIT_KEY_VALUES & $this->type) { |
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$result = current($this->batch); |
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return $result[0]; |
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} else { |
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return current($this->batchKeys); |
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} |
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} |
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public function current() |
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{ |
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if(self::SPLIT_KEY_VALUES & $this->type) { |
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$result = current($this->batch); |
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return $result[1]; |
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} else { |
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return current($this->batch); |
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} |
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} |
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} |
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SuRaMoN /
itertools
