org.semanticweb.elk.reasoner.taxonomy.hashing
Class NodeHasher

java.lang.Object
  org.semanticweb.elk.reasoner.taxonomy.hashing.NodeHasher

All Implemented Interfaces:

Hasher<Node<? extends ElkEntity>>

public class NodeHasher
extends Object
implements Hasher<Node<? extends ElkEntity>>

Helper class for hashing Nodes based on getMembers(). Implements some caching to ensure good performance even when some nodes have unusually many members.

Author:

Markus Kroetzsch, Frantisek Simancik

Field Summary

static NodeHasher

INSTANCE We use one static instance for hashing (and caching!) all nodes.

Method Summary

int	hash(Node<? extends ElkEntity> node) Compute the hash for an entity node.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static NodeHasher INSTANCE

We use one static instance for hashing (and caching!) all nodes.

Method Detail

hash

public int hash(Node<? extends ElkEntity> node)

Compute the hash for an entity node. This method implements a simple cache for nodes with unusually large numbers of members. This mainly covers the case where a huge number of classes is equal to owl:Nothing due to modelling errors.

Specified by:

hash in interface Hasher<Node<? extends ElkEntity>>

Parameters:

node -

Returns:

the has for the given entity node