org.apache.lucene.analysis

Class AutomatonToTokenStream

java.lang.Object

org.apache.lucene.analysis.AutomatonToTokenStream

public class AutomatonToTokenStream
extends Object

Converts an Automaton into a TokenStream.

Method Summary

Modifier and Type	Method and Description
static TokenStream	toTokenStream(Automaton automaton) converts an automaton into a TokenStream.

Methods inherited from class java.lang.Object

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

Method Detail

toTokenStream

public static TokenStream toTokenStream(Automaton automaton)

converts an automaton into a TokenStream. This is done by first Topo sorting the nodes in the Automaton. Nodes that have the same distance from the start are grouped together to form the position nodes for the TokenStream. The resulting TokenStream releases edges from the automaton as tokens in order from the position nodes. This requires the automaton be a finite DAG.

Parameters:

automaton - automaton to convert. Must be a finite DAG.

Returns:

TokenStream representation of automaton.