/**
* Merge this operation with a previous operation and return the
* resulting operation.
*
* @param FieldOperation $previous Previous Operation.
*
* @return FieldOperation
* @throws AVException
*/
public function _mergeWithPrevious($previous)
{
if (!$previous) {
return $this;
}
if ($previous instanceof DeleteOperation) {
return new SetOperation($this->value);
}
if ($previous instanceof SetOperation) {
return new SetOperation($previous->getValue() + $this->value);
}
if ($previous instanceof IncrementOperation) {
return new IncrementOperation($previous->getValue() + $this->value);
}
throw new AVException('Operation is invalid after previous operation.');
}
/**
* Takes a previous operation and returns a merged operation to replace it.
*
* @param FieldOperation $previous Previous operation.
*
* @return FieldOperation Merged operation.
* @throws AVException
*/
public function _mergeWithPrevious($previous)
{
if (!$previous) {
return $this;
}
if ($previous instanceof DeleteOperation) {
return $previous;
}
if ($previous instanceof SetOperation) {
return new SetOperation($this->_apply($previous->getValue(), $this->objects, null));
}
if ($previous instanceof RemoveOperation) {
$oldList = $previous->getValue();
return new RemoveOperation(array_merge((array) $oldList, (array) $this->objects));
}
throw new AVException('Operation is invalid after previous operation.');
}
/**
* Merge this operation with the previous operation and return the result.
*
* @param FieldOperation $previous Previous Operation.
*
* @return FieldOperation Merged Operation.
* @throws AVException
*/
public function _mergeWithPrevious($previous)
{
if (!$previous) {
return $this;
}
if ($previous instanceof DeleteOperation) {
return new SetOperation($this->objects);
}
if ($previous instanceof SetOperation) {
$oldValue = $previous->getValue();
$result = $this->_apply($oldValue, null, null);
return new SetOperation($result);
}
if ($previous instanceof AddUniqueOperation) {
$oldList = $previous->getValue();
$result = $this->_apply($oldList, null, null);
return new AddUniqueOperation($result);
}
throw new AVException('Operation is invalid after previous operation.');
}