Module org.apache.jena.arq

Package org.apache.jena.sparql.engine.join

Class JoinKey

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<T>

org.apache.jena.sparql.engine.join.ImmutableUniqueList<Var>

org.apache.jena.sparql.engine.join.JoinKey

All Implemented Interfaces:

Iterable<Var>, Collection<Var>, List<Var>

public final class JoinKey
extends ImmutableUniqueList<Var>

JoinKey for hash joins

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	JoinKey.Builder	The builder can emit a key every time build() is called and it can be continued to be used.

Method Summary

Modifier and Type	Method	Description
static JoinKey	create(String... varNames)
static JoinKey	create(Collection<Var> vars)
static JoinKey	create(Collection<Var> vars1, Collection<Var> vars2)	Make a JoinKey from the intersection of two sets
static JoinKey	create(Set<Var> vars)	Create a JoinKey directly from a Set.
static JoinKey	create(Var var)
static JoinKey	create(Var[] vars)
static JoinKey	createVarKey(Collection<Var> vars1, Collection<Var> vars2)	Deprecated.
static JoinKey	empty()
Var	getVarKey()	Get a single variable for this key.
static JoinKey.Builder	newBuilder()

Methods inherited from class org.apache.jena.sparql.engine.join.ImmutableUniqueList

contains, createUniqueList, createUniqueList, get, indexOf, length, newUniqueListBuilder, size

Methods inherited from class java.util.AbstractList

add, add, addAll, clear, equals, hashCode, iterator, lastIndexOf, listIterator, listIterator, remove, set, subList

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

addAll, containsAll, isEmpty, remove, removeAll, replaceAll, retainAll, sort, spliterator, toArray, toArray

Method Details

empty

public static JoinKey empty()

create

public static JoinKey create(Collection<Var> vars1,
 Collection<Var> vars2)

Make a JoinKey from the intersection of two sets

createVarKey

@Deprecated
public static JoinKey createVarKey(Collection<Var> vars1,
 Collection<Var> vars2)

Deprecated.

Make a JoinKey of single variable from the intersection of two sets.

create

public static JoinKey create(Var var)

newBuilder

public static JoinKey.Builder newBuilder()

create

public static JoinKey create(Collection<Var> vars)

create

public static JoinKey create(String... varNames)

create

public static JoinKey create(Var[] vars)

create

public static JoinKey create(Set<Var> vars)

Create a JoinKey directly from a Set. The set should be a LinkedHashSet because variable order matters for JoinKeys. This method does not rely on newBuilder().

getVarKey

public Var getVarKey()

Get a single variable for this key. For any one key, it always returns the same var