net.fortytwo.stream.shj

Class SolutionIndex<V>

java.lang.Object

net.fortytwo.stream.shj.SolutionIndex<V>

Type Parameters:

V - the value type, e.g. an RDF value class

All Implemented Interfaces:

Index<Solution<V>>

public class SolutionIndex<V>
extends java.lang.Object
implements Index<Solution<V>>

A SolutionIndex blocks for concurrent write operations, and does not block reads with respect to reads or writes.

Author:

Joshua Shinavier (http://fortytwo.net)

Constructor Summary

Constructors

Constructor and Description
SolutionIndex(QueryContext<?,V> queryContext, int cardinality)

Method Summary

Modifier and Type	Method and Description
void	add(Solution<V> solution) Adds a solution to the index.
void	clear() Removes all data at once.
int	getCardinality() Gets the variable-cardinality of this index
Index<java.util.function.Consumer<Solution<V>>>	getConsumerIndex()
java.util.Set<Solution<V>>	getSolutions()
java.util.Set<Solution<V>>	getSolutions(int index, V value)
boolean	isEmpty()
boolean	remove(Solution<V> solution) Removes the given item from this index
boolean	removePattern(V[] pattern) Removes any matching solution from the index.

Methods inherited from class java.lang.Object

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

Constructor Detail

SolutionIndex

public SolutionIndex(QueryContext<?,V> queryContext,
                     int cardinality)

Method Detail

getCardinality

public int getCardinality()

Gets the variable-cardinality of this index

Returns:

the number of distinct variables of each solution in this index

getConsumerIndex

public Index<java.util.function.Consumer<Solution<V>>> getConsumerIndex()

add

public void add(Solution<V> solution)

Adds a solution to the index. Identical but earlier-expiring solutions are displaced

Specified by:

add in interface Index<Solution<V>>

Parameters:

solution - the solution to be added

remove

public boolean remove(Solution<V> solution)

Description copied from interface: Index

Removes the given item from this index

Specified by:

remove in interface Index<Solution<V>>

Parameters:

solution - the item to remove

Returns:

whether an item was removed

removePattern

public boolean removePattern(V[] pattern)

Removes any matching solution from the index. Removal is idempotent; it is possible to "remove" without error a pattern which has already been removed

Parameters:

pattern - a pattern matching the solutions to be removed

Returns:

whether any matching solutions were found and removed

clear

public void clear()

Description copied from interface: Index

Removes all data at once. It can be assumed that the data is no longer needed; this operation resets the index and releases the data for garbage collection.

Specified by:

clear in interface Index<Solution<V>>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Index<Solution<V>>

getSolutions

public java.util.Set<Solution<V>> getSolutions()

getSolutions

public java.util.Set<Solution<V>> getSolutions(int index,
                                               V value)