Package org.apache.tinkerpop.gremlin.structure

Interface Graph.Features.EdgeFeatures

All Superinterfaces:

Graph.Features.ElementFeatures, Graph.Features.FeatureSet

Enclosing interface:

Graph.Features

public static interface Graph.Features.EdgeFeatures
extends Graph.Features.ElementFeatures

Features that are related to Edge operations.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	FEATURE_ADD_EDGES
static final String	FEATURE_REMOVE_EDGES
static final String	FEATURE_UPSERT

Fields inherited from interface org.apache.tinkerpop.gremlin.structure.Graph.Features.ElementFeatures

FEATURE_ADD_PROPERTY, FEATURE_ANY_IDS, FEATURE_CUSTOM_IDS, FEATURE_NULL_PROPERTY_VALUES, FEATURE_NUMERIC_IDS, FEATURE_REMOVE_PROPERTY, FEATURE_STRING_IDS, FEATURE_USER_SUPPLIED_IDS, FEATURE_UUID_IDS

Method Summary

Modifier and Type	Method	Description
default LabelCardinality	getLabelCardinality()	Gets the LabelCardinality for edges in this graph.
default Graph.Features.EdgePropertyFeatures	properties()	Gets features related to "properties" on an Edge.
default boolean	supportsAddEdges()	Determines if an Edge can be added to a Vertex.
default boolean	supportsRemoveEdges()	Determines if an Edge can be removed from a Vertex.
default boolean	supportsUpsert()	Determines if the Graph implementation uses upsert functionality as opposed to insert functionality for Vertex.addEdge(String, Vertex, Object...).

Methods inherited from interface org.apache.tinkerpop.gremlin.structure.Graph.Features.ElementFeatures

supportsAddProperty, supportsAnyIds, supportsCustomIds, supportsNullPropertyValues, supportsNumericIds, supportsRemoveProperty, supportsStringIds, supportsUserSuppliedIds, supportsUuidIds, willAllowId

Field Details

FEATURE_ADD_EDGES

static final String FEATURE_ADD_EDGES

See Also:

• Constant Field Values

FEATURE_REMOVE_EDGES

static final String FEATURE_REMOVE_EDGES

See Also:

• Constant Field Values

FEATURE_UPSERT

static final String FEATURE_UPSERT

See Also:

• Constant Field Values

Method Details

supportsAddEdges

default boolean supportsAddEdges()

Determines if an Edge can be added to a Vertex.

supportsRemoveEdges

default boolean supportsRemoveEdges()

Determines if an Edge can be removed from a Vertex.

supportsUpsert

default boolean supportsUpsert()

Determines if the Graph implementation uses upsert functionality as opposed to insert functionality for Vertex.addEdge(String, Vertex, Object...). This feature gives graph providers some flexibility as to how graph mutations are treated. For graph providers, testing of this feature (as far as TinkerPop is concerned) only covers graphs that can support user supplied identifiers as there is no other way for TinkerPop to know what aspect of a edge is unique to appropriately apply assertions. Graph providers, especially those who support schema features, may have other methods for uniquely identifying a edge and should therefore resort to their own body of tests to validate this feature.

properties

default Graph.Features.EdgePropertyFeatures properties()

Gets features related to "properties" on an Edge.

getLabelCardinality

default LabelCardinality getLabelCardinality()

Gets the LabelCardinality for edges in this graph. Edge labels are always immutable (exactly one label, set at creation time).

Returns:

the label cardinality for edges, always LabelCardinality.ONE

Since:

4.0.0