org.neo4j.kernel.api.operations
Interface LabelOperations

All Known Subinterfaces:

StatementContext

public interface LabelOperations

Method Summary

boolean	addLabelToNode(long labelId, long nodeId) Labels a node with the label corresponding to the given label id.
long	getLabelId(String label) Returns a label id for a label name.
String	getLabelName(long labelId) Returns the label name for the given label id.
Iterator<Long>	getLabelsForNode(long nodeId) Returns all labels set on node with id nodeId.
long	getOrCreateLabelId(String label) Returns a label id for a label name.
boolean	isLabelSetOnNode(long labelId, long nodeId) Checks if a node is labeled with a certain label or not.
boolean	removeLabelFromNode(long labelId, long nodeId) Removes a label with the corresponding id from a node.

Method Detail

getOrCreateLabelId

long getOrCreateLabelId(String label)
                        throws ConstraintViolationKernelException

Returns a label id for a label name. If the label doesn't exist prior to this call it gets created.

Throws:

ConstraintViolationKernelException

getLabelId

long getLabelId(String label)
                throws LabelNotFoundKernelException

Returns a label id for a label name. If the label doesn't exist a LabelNotFoundKernelException will be thrown.

Throws:

LabelNotFoundKernelException

getLabelName

String getLabelName(long labelId)
                    throws LabelNotFoundKernelException

Returns the label name for the given label id.

Throws:

LabelNotFoundKernelException

addLabelToNode

boolean addLabelToNode(long labelId,
                       long nodeId)

Labels a node with the label corresponding to the given label id. If the node already had that label nothing will happen. Label ids are retrieved from getOrCreateLabelId(String) or getLabelId(String).

isLabelSetOnNode

boolean isLabelSetOnNode(long labelId,
                         long nodeId)

Checks if a node is labeled with a certain label or not. Returns true if the node is labeled with the label, otherwise false. Label ids are retrieved from getOrCreateLabelId(String) or getLabelId(String).

getLabelsForNode

Iterator<Long> getLabelsForNode(long nodeId)

Returns all labels set on node with id nodeId. If the node has no labels an empty Iterable will be returned.

removeLabelFromNode

boolean removeLabelFromNode(long labelId,
                            long nodeId)

Removes a label with the corresponding id from a node. If the node doesn't have that label nothing will happen. Label ids are retrieved from getOrCreateLabelId(String) or getLabelId(String).