/**
* Gets a writer for a DataObject
*
* If the field already has a value, a writer is created matching that
* identifier. Otherwise, a new writer is created based on either
*
* - The $type passed in
* - whether the $object class specifies a prefered storage type via
* getEffectiveContentStore
* - what the `defaultStore` is set to for the content service
*
*
* @param DataObject $object
* The object to get a writer for
* @param String $field
* The field being written to
* @param String $type
* Explicitly state what the content store type will be
* @return ContentWriter
*/
public function getWriterFor(DataObject $object = null, $field = 'FilePointer', $type = null)
{
if ($object && $field && $object->hasField($field)) {
$val = $object->{$field};
if (strlen($val)) {
$reader = $this->getReader($val);
if ($reader && $reader->isReadable()) {
return $reader->getWriter();
}
}
}
if (!$type) {
// specifically expecting to be handling File objects, but allows other
// objects to play too
if ($object && $object->hasMethod('getEffectiveContentStore')) {
$type = $object->getEffectiveContentStore();
} else {
$type = $this->defaultStore;
}
}
// looks like we're getting a writer with no underlying file (as yet)
return $this->getWriter($type);
}
