Constraint

sealed class Constraint

Represents constraints on the values of data nodes sent by subscriptions.

Between	`class Between : Constraint` Children between: the values of data nodes sent by subscriptions will be limited to the child nodes of the actual data nodes whose keys are between startKey and endKey (included).
EndAt	`class EndAt : Constraint` limit children until endKey: the values of data nodes sent by subscriptions will be limited to the last limit child nodes (or all child nodes if limit is not set) of the actual data nodes whose keys are lesser or equal endKey.
First	`class First : Constraint` First limit children: the values of data nodes sent by subscriptions will be limited to the first limit child nodes of the actual data nodes.
Last	`class Last : Constraint` Last limit children: the values of data nodes sent by subscriptions will be limited to the last limit child nodes of the actual data nodes.
None	`object None : Constraint` No constraint: the values of data nodes are sent without filtering any child node.
StartAt	`class StartAt : Constraint` limit children from startKey: the values of data nodes sent by subscriptions will be limited to the first *limit child nodes (or all child nodes if limit is not set) of the actual data nodes whose keys are greater or equal startKey.

Between	`class Between : Constraint` Children between: the values of data nodes sent by subscriptions will be limited to the child nodes of the actual data nodes whose keys are between startKey and endKey (included).
EndAt	`class EndAt : Constraint` limit children until endKey: the values of data nodes sent by subscriptions will be limited to the last limit child nodes (or all child nodes if limit is not set) of the actual data nodes whose keys are lesser or equal endKey.
First	`class First : Constraint` First limit children: the values of data nodes sent by subscriptions will be limited to the first limit child nodes of the actual data nodes.
Last	`class Last : Constraint` Last limit children: the values of data nodes sent by subscriptions will be limited to the last limit child nodes of the actual data nodes.
None	`object None : Constraint` No constraint: the values of data nodes are sent without filtering any child node.
StartAt	`class StartAt : Constraint` limit children from startKey: the values of data nodes sent by subscriptions will be limited to the first *limit child nodes (or all child nodes if limit is not set) of the actual data nodes whose keys are greater or equal startKey.