Interface CollectionFactory
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- All Superinterfaces:
AutoCloseable
- All Known Implementing Classes:
DefaultCollectionFactory
,MapDb3CollectionFactory
,MapDbCollectionFactory
@InternalUseOnly public interface CollectionFactory extends AutoCloseable
A Factory that may generate optimised and/or disk based collections Factories like this should not be cached but created a new everytime as the closing is important if they are disk based.
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Method Summary
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Method Detail
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close
void close() throws RDF4JException
- Specified by:
close
in interfaceAutoCloseable
- Throws:
RDF4JException
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createList
<T> List<T> createList()
- Type Parameters:
T
- of the list- Returns:
- a list that may be optimised and/or disk based
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createValueList
List<Value> createValueList()
- Returns:
- a list that may be optimised and/or disk based for Values only
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createSet
<T> Set<T> createSet()
- Type Parameters:
T
- of the set- Returns:
- a set that may be optimised and/or disk based
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createSetOfBindingSets
default Set<BindingSet> createSetOfBindingSets()
- Returns:
- a set that may be optimised and/or disk based
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createSetOfBindingSets
Set<BindingSet> createSetOfBindingSets(Supplier<MutableBindingSet> create, Function<String,Predicate<BindingSet>> getHas, Function<String,Function<BindingSet,Value>> getGet, Function<String,BiConsumer<Value,MutableBindingSet>> getSet)
Allows optimizations beyond what would otherwise be possible, regarding disk access and storage.- Parameters:
create
- a supplier that makes bindingsetsa
- supplier used to create prebound hasBinding predicatesa
- supplier used to create prebound getValue functionsa
- supplier used to create prebound setValue functions- Returns:
- a set that may be optimised and/or disk based
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createValueSet
Set<Value> createValueSet()
- Returns:
- a set that may be optimised and/or disk based for Values
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createMap
<K,V> Map<K,V> createMap()
- Type Parameters:
K
- key typeV
- value type- Returns:
- a map
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createValueKeyedMap
<V> Map<Value,V> createValueKeyedMap()
- Type Parameters:
V
- value type- Returns:
- a map
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createQueue
<T> Queue<T> createQueue()
- Type Parameters:
T
- of the contents of the queue- Returns:
- a new queue
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createBindingSetQueue
@Experimental default Queue<BindingSet> createBindingSetQueue(Supplier<MutableBindingSet> create, Function<String,Predicate<BindingSet>> getHas, Function<String,Function<BindingSet,Value>> getget, Function<String,BiConsumer<Value,MutableBindingSet>> getSet)
- Returns:
- a new queue that may be optimized and may use the functions passed in.
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createBindingSetQueue
@Experimental default Queue<BindingSet> createBindingSetQueue()
- Returns:
- a new queue optimized for bindingsets
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createGroupByMap
@InternalUseOnly <E> Map<BindingSetKey,E> createGroupByMap()
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createBindingSetKey
@InternalUseOnly BindingSetKey createBindingSetKey(BindingSet bindingSet, List<Function<BindingSet,Value>> getValues, ToIntFunction<BindingSet> hashOfBindingSetCalculator)
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hashAValue
@InternalUseOnly default int hashAValue(Function<BindingSet,Value> getValue, int nextHash, BindingSet bs)
Hashes a value that complies with the hashCode/equals conception but only in context of this collection/factory storage layer. Potentially also only valid during a single transaction scope.- Parameters:
getValue
- the function to extract the value to hashnextHash
- any previously calculated hash value for earlier values in the BindingSetbs
- the bindingset to take the value from- Returns:
- a hash function
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hashOfBindingSetFuntion
@InternalUseOnly default ToIntFunction<BindingSet> hashOfBindingSetFuntion(List<Function<BindingSet,Value>> getValues)
Generate a method that calculates a hash code that is valid in context of a single store implementation and QueryExecutionContext.- Parameters:
getValues
- that should be considered in the hash- Returns:
- a hash function
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