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<?php |
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namespace frictionlessdata\datapackage\DataStreams; |
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use frictionlessdata\datapackage\Exceptions\DataStreamValidationException; |
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use frictionlessdata\datapackage\Exceptions\DataStreamOpenException; |
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use frictionlessdata\tableschema\DataSources\CsvDataSource; |
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use frictionlessdata\tableschema\Schema; |
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use frictionlessdata\tableschema\Table; |
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use frictionlessdata\tableschema\Exceptions\FieldValidationException; |
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use frictionlessdata\tableschema\Exceptions\DataSourceException; |
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class TabularDataStream extends BaseDataStream |
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{ |
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public $table; |
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public $schema; |
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public function __construct($dataSource, $dataSourceOptions = null) |
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{ |
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parent::__construct($dataSource, $dataSourceOptions); |
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$schema = $this->dataSourceOptions; |
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if (empty($schema)) { |
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throw new \Exception('schema is required for tabular data stream'); |
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} else { |
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try { |
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$this->schema = new Schema($schema); |
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$this->table = new Table($this->getDataSourceObject(), $this->schema); |
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} catch (\Exception $e) { |
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throw new DataStreamOpenException('Failed to open tabular data source '.json_encode($dataSource).': '.json_encode($e->getMessage())); |
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} |
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} |
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} |
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protected function getDataSourceObject() |
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{ |
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return new CsvDataSource($this->dataSource); |
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} |
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public function rewind() |
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{ |
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$this->table->rewind(); |
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} |
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public function save($filename) |
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{ |
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$this->table->save($filename); |
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} |
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/** |
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* @return array |
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* |
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* @throws DataStreamValidationException |
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*/ |
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public function current() |
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{ |
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try { |
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return $this->table->current(); |
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} catch (DataSourceException $e) { |
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throw new DataStreamValidationException($e->getMessage()); |
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} catch (FieldValidationException $e) { |
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throw new DataStreamValidationException($e->getMessage()); |
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} |
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} |
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public function key() |
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{ |
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return $this->table->key(); |
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} |
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public function next() |
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{ |
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$this->table->next(); |
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} |
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public function valid() |
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{ |
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return $this->table->valid(); |
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} |
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} |
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frictionlessdata /
datapackage-php
