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Mini Shell
Mini Shell
<?php
namespace Ddeboer\DataImport\Reader;
use Ddeboer\DataImport\Reader;
use Ddeboer\DataImport\Exception\ReaderException;
/**
* Takes multiple readers for processing in the same workflow
*
* @author Adam Paterson <hello@adampaterson.co.uk>
* @author Aydin Hassan <aydin@hotmail.co.uk>
*/
class OneToManyReader implements CountableReader
{
/**
* @var Reader
*/
protected $leftReader;
/**
* @var Reader
*/
protected $rightReader;
/**
* @var string
*/
protected $leftJoinField;
/**
* @var string
*/
protected $rightJoinField;
/**
* Key to nest the rightRows under
*
* @var string
*/
protected $nestKey;
/**
* @param Reader $leftReader
* @param Reader $rightReader
* @param string $nestKey
* @param string $leftJoinField
* @param string $rightJoinField
*/
public function __construct(
Reader $leftReader,
Reader $rightReader,
$nestKey,
$leftJoinField,
$rightJoinField = null
) {
if (is_null($rightJoinField)) {
$rightJoinField = $leftJoinField;
}
$this->leftJoinField = $leftJoinField;
$this->rightJoinField = $rightJoinField;
$this->leftReader = $leftReader;
$this->rightReader = $rightReader;
$this->nestKey = $nestKey;
}
/**
* Create an array of children in the leftRow,
* with the data returned from the right reader
* Where the ID fields Match
*
* @return array
*
* @throws ReaderException
*/
public function current()
{
$leftRow = $this->leftReader->current();
if (array_key_exists($this->nestKey, $leftRow)) {
throw new ReaderException(
sprintf(
'Left Row: "%s" Reader already contains a field named "%s". Please choose a different nest key field',
$this->key(),
$this->nestKey
)
);
}
$leftRow[$this->nestKey] = [];
$leftId = $this->getRowId($leftRow, $this->leftJoinField);
$rightRow = $this->rightReader->current();
$rightId = $this->getRowId($rightRow, $this->rightJoinField);
while ($leftId == $rightId && $this->rightReader->valid()) {
$leftRow[$this->nestKey][] = $rightRow;
$this->rightReader->next();
$rightRow = $this->rightReader->current();
if($this->rightReader->valid()) {
$rightId = $this->getRowId($rightRow, $this->rightJoinField);
}
}
return $leftRow;
}
/**
* @param array $row
* @param string $idField
*
* @return mixed
*
* @throws ReaderException
*/
protected function getRowId(array $row, $idField)
{
if (!array_key_exists($idField, $row)) {
throw new ReaderException(
sprintf(
'Row: "%s" has no field named "%s"',
$this->key(),
$idField
)
);
}
return $row[$idField];
}
/**
* {@inheritdoc}
*/
public function next()
{
$this->leftReader->next();
//right reader is iterated in current() method.
}
/**
* {@inheritdoc}
*/
public function key()
{
return $this->leftReader->key();
}
/**
* {@inheritdoc}
*/
public function valid()
{
return $this->leftReader->valid() && $this->rightReader->valid();
}
/**
* {@inheritdoc}
*/
public function rewind()
{
$this->leftReader->rewind();
$this->rightReader->rewind();
}
/**
* {@inheritdoc}
*/
public function getFields()
{
return array_merge($this->leftReader->getFields(), [$this->nestKey]);
}
/**
* {@inheritdoc}
*/
public function count()
{
return $this->leftReader->count();
}
}
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