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

  • Constructor Details

    • StorageNodeAltBase

      public StorageNodeAltBase(TupleBridge<D,C> tupleAccessor)

  • Method Details

    • 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, TupleAccessor<? 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, TupleAccessor<? 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, TupleAccessor<? 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
      Type Parameters:
      T -
      Parameters:
      pattern -
      accessor -
      Returns:

    • streamerForKeys

      public <T> Streamer<V,?> streamerForKeys(T pattern, TupleAccessor<? super T, ? extends C> accessor)

    • streamerForKeyAndSubStoreAlts

      public <T> Streamer<V, ? extends Map.Entry<?,?>> streamerForKeyAndSubStoreAlts(T pattern, TupleAccessor<? super T, ? extends C> accessor)
      Stream a single entry of the store alts themselves children can then pick an alternative based on their index
      Type Parameters:
      T -
      Parameters:
      pattern -
      accessor -
      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().
      Parameters:
      key -
      idx - In the range 0 to
      invalid @link 
      {@link getKeyTupleIdxs().length
      } (exclusive) If a key has no components calling this method will always raise IndexOutOfBoundsException
      Returns: