ai.grakn.graql.internal.gremlin.fragment

Class LabelFragment

java.lang.Object

ai.grakn.graql.internal.gremlin.fragment.Fragment

ai.grakn.graql.internal.gremlin.fragment.LabelFragment

public abstract class LabelFragment
extends Fragment

A fragment representing traversing a label.

Author:

Grakn Warriors

Property Summary

Properties inherited from class ai.grakn.graql.internal.gremlin.fragment.Fragment

varProperty

Field Summary

Fields inherited from class ai.grakn.graql.internal.gremlin.fragment.Fragment

SHARD_LOAD_FACTOR

Constructor Summary

Constructors

Constructor and Description
LabelFragment()

Method Summary

Modifier and Type	Method and Description
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal<org.apache.tinkerpop.gremlin.structure.Vertex,? extends org.apache.tinkerpop.gremlin.structure.Element>	applyTraversalInner(org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal<org.apache.tinkerpop.gremlin.structure.Vertex,? extends org.apache.tinkerpop.gremlin.structure.Element> traversal, EmbeddedGraknTx<?> tx, Collection<Var> vars)
Long	getShardCount(EmbeddedGraknTx<?> tx)
boolean	hasFixedFragmentCost() If a fragment has fixed cost, the traversal is done using index.
double	internalFragmentCost()
abstract com.google.common.collect.ImmutableSet<Label>	labels()
String	name() The name of the fragment

Methods inherited from class ai.grakn.graql.internal.gremlin.fragment.Fragment

applyTraversal, canOperateOnEdges, dependencies, directedEdges, end, fragmentCost, getInverse, isStartingFragment, setAccurateFragmentCost, start, toString, transform, varProperty, vars

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LabelFragment

public LabelFragment()

Method Detail

labels

public abstract com.google.common.collect.ImmutableSet<Label> labels()

applyTraversalInner

public org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal<org.apache.tinkerpop.gremlin.structure.Vertex,? extends org.apache.tinkerpop.gremlin.structure.Element> applyTraversalInner(org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal<org.apache.tinkerpop.gremlin.structure.Vertex,? extends org.apache.tinkerpop.gremlin.structure.Element> traversal,
                                                                                                                                                                                                           EmbeddedGraknTx<?> tx,
                                                                                                                                                                                                           Collection<Var> vars)

Parameters:

traversal - the traversal to extend with this Fragment

tx - the EmbeddedGraknTx to execute the traversal on

name

public String name()

Description copied from class: Fragment

The name of the fragment

Specified by:

name in class Fragment

internalFragmentCost

public double internalFragmentCost()

Specified by:

internalFragmentCost in class Fragment

hasFixedFragmentCost

public boolean hasFixedFragmentCost()

Description copied from class: Fragment

If a fragment has fixed cost, the traversal is done using index. This makes the fragment a good starting point. A plan should always start with these fragments when possible.

Overrides:

hasFixedFragmentCost in class Fragment

getShardCount

public Long getShardCount(EmbeddedGraknTx<?> tx)

Overrides:

getShardCount in class Fragment