/**
* Convert a comparison expression into the target query language output.
*
* @param Comparison $comparison
*
* @return callable
*
* @throws ExpressionException
*/
public function walkComparison(Comparison $comparison)
{
$field = $comparison->getField();
$value = $comparison->getValue();
switch ($comparison->getOperator()) {
case Comparison::EQUAL:
case Comparison::IS_NULL:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::getObjectFieldValue($object, $field) === $value;
};
case Comparison::NOT_EQUAL:
case Comparison::IS_NOT_NULL:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::getObjectFieldValue($object, $field) !== $value;
};
case Comparison::LOWER_THAN:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::getObjectFieldValue($object, $field) < $value;
};
case Comparison::LOWER_THAN_EQUAL:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::getObjectFieldValue($object, $field) <= $value;
};
case Comparison::GREATER_THAN:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::getObjectFieldValue($object, $field) > $value;
};
case Comparison::GREATER_THAN_EQUAL:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::getObjectFieldValue($object, $field) >= $value;
};
case Comparison::IN:
return function ($object) use($field, $value) {
return in_array(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
};
case Comparison::NOT_IN:
return function ($object) use($field, $value) {
return !in_array(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
};
case Comparison::EXISTS:
return function ($object) use($value) {
foreach ($value as $row) {
if ($row !== $object || serialize($row) === serialize($object)) {
return true;
}
}
return false;
};
case Comparison::NOT_EXISTS:
return function ($object) use($value) {
foreach ($value as $row) {
if ($row !== $object || serialize($row) === serialize($object)) {
return false;
}
}
return true;
};
case Comparison::LIKE:
return function ($object) use($field, $value) {
return ClosureExpressionVisitor::findString(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
};
case Comparison::NOT_LIKE:
return function ($object) use($field, $value) {
return !ClosureExpressionVisitor::findString(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
};
default:
throw ExpressionException::unknownExpressionOperator($comparison);
}
}
/**
* {@inheritdoc}
*
* @return Collection
*/
public function matching(Criteria $criteria)
{
$elements = $this->elements;
if ($expression = $criteria->getExpression()) {
$visitor = new ClosureExpressionVisitor();
$filter = $visitor->dispatch($expression);
$elements = array_filter($elements, $filter);
}
if ($orderings = $criteria->getOrderings()) {
$next = null;
foreach (array_reverse($orderings) as $field => $ordering) {
$next = ClosureExpressionVisitor::sortByField($field, $ordering == Criteria::ORDER_DESC ? -1 : 1, $next);
}
usort($elements, $next);
}
$offset = $criteria->getFirstResult();
$length = $criteria->getMaxResults();
if ($offset || $length) {
$elements = array_splice($elements, (int) $offset, $length);
}
return new static($elements);
}
