/**
* {@inheritdoc}
*/
public function &addValueExtractor(ValueExtractorInterface $extractor)
{
$extract_as_field = $extractor->getFieldName();
foreach ($this->value_extractors as $value_extractor) {
if ($value_extractor->getFieldName() === $extract_as_field) {
throw new InvalidArgumentException("Field name '{$extract_as_field}' is taken");
}
}
$this->value_extractors[] = $extractor;
return $this;
}
/**
* Prpeare generated field statement.
*
* @param FieldInterface $source_field
* @param ValueExtractorInterface $extractor
* @return string
*/
public function prepareGeneratedFieldStatement(FieldInterface $source_field, ValueExtractorInterface $extractor)
{
$generated_field_name = $this->getConnection()->escapeFieldName($extractor->getFieldName());
switch ($extractor->getValueCaster()) {
case ValueCasterInterface::CAST_INT:
$field_type = 'INT';
break;
case ValueCasterInterface::CAST_FLOAT:
$field_type = 'DECIMAL(12, 2)';
break;
case ValueCasterInterface::CAST_BOOL:
$field_type = 'TINYINT(1) UNSIGNED';
break;
case ValueCasterInterface::CAST_DATE:
$field_type = 'DATE';
break;
case ValueCasterInterface::CAST_DATETIME:
$field_type = 'DATETIME';
break;
case ValueCasterInterface::CAST_JSON:
$field_type = 'JSON';
break;
default:
$field_type = 'VARCHAR(191)';
}
$expression = $this->prepareGeneratedFieldExpression($this->getConnection()->escapeFieldName($source_field->getName()), var_export($extractor->getExpression(), true), $extractor->getValueCaster(), $this->getConnection()->escapeValue($extractor->getDefaultValue()));
$storage = $extractor->getStoreValue() ? 'STORED' : 'VIRTUAL';
return trim("{$generated_field_name} {$field_type} AS ({$expression}) {$storage}");
}