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<?php |
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namespace Ivory\Relation; |
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use Ivory\Exception\AmbiguousException; |
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use Ivory\Exception\InternalException; |
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use Ivory\Exception\UndefinedColumnException; |
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use Ivory\Relation\Alg\ITupleEvaluator; |
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class ProjectedRelation extends ProjectedRelationBase |
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{ |
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/** @var array list: either index to the source tuple data to take, or a tuple evaluator */ |
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private $projectionList; |
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public function __construct(IRelation $source, $colDef) |
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{ |
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parent::__construct($source, $this->defineColumns($source, $colDef)); |
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} |
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private function defineColumns(IRelation $source, $colDef) |
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{ |
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$srcCols = $source->getColumns(); |
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$columns = []; |
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$this->projectionList = []; |
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foreach ($colDef as $key => $value) { |
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$nameSpecified = (filter_var($key, FILTER_VALIDATE_INT) === false || is_object($value)); |
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$colName = ($nameSpecified ? $key : (isset($srcCols[$value]) ? $srcCols[$value]->getName() : $value)); |
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if (filter_var($value, FILTER_VALIDATE_INT) !== false) { // column offset |
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if (!isset($srcCols[$value])) { |
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throw new UndefinedColumnException($value); |
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} |
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$columns[] = new Column($this, count($this->projectionList), $colName, $srcCols[$value]->getType()); |
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$this->projectionList[] = (int)$value; |
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} elseif (is_string($value)) { // column name |
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$matched = $this->recognizeColsByName($srcCols, $nameSpecified, $key, $value); |
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foreach ($matched as $i => $cn) { |
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$columns[] = new Column($this, count($this->projectionList), $cn, $srcCols[$i]->getType()); |
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$this->projectionList[] = $i; |
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} |
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} elseif ($value instanceof ITupleEvaluator || $value instanceof \Closure) { |
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$columns[] = new Column($this, $value, $colName, null); |
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$this->projectionList[] = $value; |
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} else { |
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throw new \InvalidArgumentException("Invalid specification of the projection item '$key'"); |
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} |
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} |
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return $columns; |
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} |
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/** |
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* @param IColumn[] $srcCols |
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* @param bool $nameSpecified |
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* @param $key |
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* @param string $value |
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* @return string[] |
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*/ |
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private function recognizeColsByName($srcCols, bool $nameSpecified, $key, string $value) |
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{ |
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if ($value[0] == '/') { // PCRE macro |
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$pcre = $value; |
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$matchAll = true; |
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$repl = ($nameSpecified ? $key : null); |
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} else { |
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$pcre = self::simpleMacroPatternToPcre($value, $starCnt); |
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$matchAll = ($starCnt > 0); |
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$repl = ($nameSpecified ? self::simpleMacroReplacementToPcre($key) : null); |
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} |
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if ($repl === null) { |
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$cns = []; |
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foreach ($srcCols as $i => $c) { |
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$name = $c->getName(); |
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if ($name !== null) { |
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$cns[$i] = $name; |
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} |
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} |
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$matched = preg_grep($pcre, $cns); |
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} else { |
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$matched = []; |
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foreach ($srcCols as $i => $c) { |
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if ($c->getName() !== null) { |
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$newName = preg_replace($pcre, $repl, $c->getName(), 1, $cnt); |
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if ($cnt > 0) { |
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$matched[$i] = $newName; |
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} |
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} |
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} |
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} |
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if (!$matched) { |
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throw new UndefinedColumnException($value); |
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} |
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if (!$matchAll && count($matched) > 1) { |
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throw new AmbiguousException($value); |
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} |
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return $matched; |
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} |
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public function tuple(int $offset = 0): ITuple |
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{ |
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$srcTuple = parent::tuple($offset); |
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$data = []; |
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foreach ($this->projectionList as $i => $spec) { |
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if (is_int($spec)) { |
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$data[$i] = $srcTuple[$spec]; |
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} elseif ($spec instanceof ITupleEvaluator) { |
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$data[$i] = $spec->evaluate($srcTuple); |
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} elseif ($spec instanceof \Closure) { |
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$data[$i] = call_user_func($spec, $srcTuple); |
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} else { |
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throw new InternalException("The type of projection list item $i is not supported"); |
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} |
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} |
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return new Tuple($data, $this->getColNameMap()); |
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} |
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} |
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ondrej-bouda /
ivory
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.