Package org.aksw.commons.index.core

Class StorageNodeAltBase<D,C,V>

java.lang.Object

org.aksw.commons.index.core.StorageNodeBase<D,C,V>

org.aksw.commons.index.core.StorageNodeAltBase<D,C,V>

Type Parameters:

D -

C -

V -

All Implemented Interfaces:

StorageNode<D,C,V>

Direct Known Subclasses:

StorageNodeAlt2, StorageNodeAlt3, StorageNodeAltN

public abstract class StorageNodeAltBase<D,C,V>
extends StorageNodeBase<D,C,V>

Base class for index nodes that do not index by a key - or rather: index by a single key that is a zero-sized tuple

Author:

Claus Stadler 11/09/2020

Field Summary

Fields inherited from class org.aksw.commons.index.core.StorageNodeBase

tupleAccessor, tupleIdxs

Constructor Summary

Constructors

Constructor	Description
StorageNodeAltBase(org.aksw.commons.tuple.TupleAccessor<D,C> tupleAccessor)

Method Summary

Modifier and Type	Method	Description
C	getKeyComponentRaw(Object key, int idx)	Obtain components from the internal representation of key that was used for indexing w.r.t.
boolean	isAltNode()	Whether this storage node stores are a sequences of alternatives Experimental method; may be replaced by a generic getStoreType() method that returns e.g Alt.class, Set.class, etc.
<T> Streamer<V,? extends Map.Entry<?,?>>	streamerForKeyAndSubStoreAlts(T pattern, org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)	Stream a single entry of the store alts themselves children can then pick an alternative based on their index
<T> Streamer<V,?>	streamerForKeys(T pattern, org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)
<T> Streamer<V,C>	streamerForKeysAsComponent(T pattern, org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)	Compiles from a given pattern a function that can stream the matching keys from the appropriate store.
<T> Streamer<V,List<C>>	streamerForKeysAsTuples(T pattern, org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)	Compiles from a given pattern a function that can stream the matching keys from the appropriate store.
<T> Streamer<V,V>	streamerForValues(T pattern, org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)	Returns an object that can extract the stream of values at an index node under constraints map: { entry.value | entry in map and entry.key matches condition} leafSet: set.entries.stream() A leaf set does not have any keys that could affect the result stream

Methods inherited from class org.aksw.commons.index.core.StorageNodeBase

getKeyTupleIdxs, getTupleAccessor

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.aksw.commons.index.core.StorageNode

chooseSubStore, chooseSubStoreRaw, getChildren, getPublicDelegate, getStoreAsList, getStoreAsMap, getStoreAsSet, holdsDomainTuples, isDelegate, isListNode, isMapNode, isSetNode, streamEntries, streamEntries, streamEntriesRaw, streamEntriesRaw

Constructor Detail

StorageNodeAltBase

public StorageNodeAltBase(org.aksw.commons.tuple.TupleAccessor<D,C> tupleAccessor)

Method Detail

isAltNode

public boolean isAltNode()

Description copied from interface: StorageNode

Whether this storage node stores are a sequences of alternatives Experimental method; may be replaced by a generic getStoreType() method that returns e.g Alt.class, Set.class, etc.

Returns:

streamerForKeysAsComponent

public <T> Streamer<V,C> streamerForKeysAsComponent(T pattern,
                                                          org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)

Description copied from interface: StorageNode

Compiles from a given pattern a function that can stream the matching keys from the appropriate store. The keys must be instances of the component type otherwise an exception is raised

Returns:

streamerForKeysAsTuples

public <T> Streamer<V,List<C>> streamerForKeysAsTuples(T pattern,
                                                             org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)

Description copied from interface: StorageNode

Compiles from a given pattern a function that can stream the matching keys from the appropriate store. The keys must be instances of the component type otherwise an exception is raised if getKeyTupleIdxs().length == 0 then returns a single tuple that projects no components

Returns:

streamerForValues

public <T> Streamer<V,V> streamerForValues(T pattern,
                                                 org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)

Description copied from interface: StorageNode

Returns an object that can extract the stream of values at an index node under constraints map: { entry.value | entry in map and entry.key matches condition} leafSet: set.entries.stream() A leaf set does not have any keys that could affect the result stream

Returns:

streamerForKeys

public <T> Streamer<V,?> streamerForKeys(T pattern,
                                               org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)

streamerForKeyAndSubStoreAlts

public <T> Streamer<V,? extends Map.Entry<?,?>> streamerForKeyAndSubStoreAlts(T pattern,
                                                                                          org.aksw.commons.tuple.TupleAccessorCore<? super T,? extends C> accessor)

Stream a single entry of the store alts themselves children can then pick an alternative based on their index

Returns:

getKeyComponentRaw

public C getKeyComponentRaw(Object key,
                            int idx)

Description copied from interface: StorageNode

Obtain components from the internal representation of key that was used for indexing w.r.t. StorageNode.getKeyTupleIdxs().

idx - In the range 0 to {@link getKeyTupleIdxs().length} (exclusive) If a key has no components calling this method will always raise IndexOutOfBoundsException

Returns: