org.apache.tinkerpop.gremlin.structure

Interface Graph.Features.VertexFeatures

All Superinterfaces:

Graph.Features.ElementFeatures, Graph.Features.FeatureSet

Enclosing interface:

Graph.Features

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

Features that are related to Vertex operations.

Field Summary

Fields

Modifier and Type	Field and Description
static String	FEATURE_ADD_VERTICES
static String	FEATURE_DUPLICATE_MULTI_PROPERTIES
static String	FEATURE_META_PROPERTIES
static String	FEATURE_MULTI_PROPERTIES
static String	FEATURE_REMOVE_VERTICES
static 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 and Description
default VertexProperty.Cardinality	getCardinality(String key) Gets the VertexProperty.Cardinality for a key.
default Graph.Features.VertexPropertyFeatures	properties() Gets features related to "properties" on a Vertex.
default boolean	supportsAddVertices() Determines if a Vertex can be added to the Graph.
default boolean	supportsDuplicateMultiProperties() Determines if a Vertex can support non-unique values on the same key.
default boolean	supportsMetaProperties() Determines if a Vertex can support properties on vertex properties.
default boolean	supportsMultiProperties() Determines if a Vertex can support multiple properties with the same key.
default boolean	supportsRemoveVertices() Determines if a Vertex can be removed from the Graph.
default boolean	supportsUpsert() Determines if the Graph implementation uses upsert functionality as opposed to insert functionality for Graph.addVertex(String).

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

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

Field Detail

FEATURE_ADD_VERTICES

static final String FEATURE_ADD_VERTICES

See Also:

Constant Field Values

FEATURE_MULTI_PROPERTIES

static final String FEATURE_MULTI_PROPERTIES

See Also:

Constant Field Values

FEATURE_DUPLICATE_MULTI_PROPERTIES

static final String FEATURE_DUPLICATE_MULTI_PROPERTIES

See Also:

Constant Field Values

FEATURE_META_PROPERTIES

static final String FEATURE_META_PROPERTIES

See Also:

Constant Field Values

FEATURE_REMOVE_VERTICES

static final String FEATURE_REMOVE_VERTICES

See Also:

Constant Field Values

FEATURE_UPSERT

static final String FEATURE_UPSERT

See Also:

Constant Field Values

Method Detail

getCardinality

default VertexProperty.Cardinality getCardinality(String key)

Gets the VertexProperty.Cardinality for a key. By default, this method will return VertexProperty.Cardinality.list. Implementations that employ a schema can consult it to determine the VertexProperty.Cardinality. Those that do no have a schema can return their default VertexProperty.Cardinality for every key.

Note that this method is primarily used by TinkerPop for internal usage and may not be suitable to reliably determine the cardinality of a key. For some implementation it may offer little more than a hint on the actual cardinality. Generally speaking it is likely best to drop down to the API of the Graph implementation for any schema related queries.

supportsAddVertices

default boolean supportsAddVertices()

Determines if a Vertex can be added to the Graph.

supportsRemoveVertices

default boolean supportsRemoveVertices()

Determines if a Vertex can be removed from the Graph.

supportsMultiProperties

default boolean supportsMultiProperties()

Determines if a Vertex can support multiple properties with the same key.

supportsDuplicateMultiProperties

default boolean supportsDuplicateMultiProperties()

Determines if a Vertex can support non-unique values on the same key. For this value to be true, then supportsMetaProperties() must also return true. By default this method, just returns what supportsMultiProperties() returns.

supportsMetaProperties

default boolean supportsMetaProperties()

Determines if a Vertex can support properties on vertex properties. It is assumed that a graph will support all the same data types for meta-properties that are supported for regular properties.

supportsUpsert

default boolean supportsUpsert()

Determines if the Graph implementation uses upsert functionality as opposed to insert functionality for Graph.addVertex(String). 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 vertex is unique to appropriately apply assertions. Graph providers, especially those who support schema features, may have other methods for uniquely identifying a vertex and should therefore resort to their own body of tests to validate this feature.

properties

default Graph.Features.VertexPropertyFeatures properties()

Gets features related to "properties" on a Vertex.