Package org.apache.lucene.util.graph

Class GraphTokenStreamFiniteStrings

java.lang.Object

org.apache.lucene.util.graph.GraphTokenStreamFiniteStrings

public final class GraphTokenStreamFiniteStrings
extends Object

Consumes a TokenStream and creates an Automaton where the transition labels are terms from the TermToBytesRefAttribute. This class also provides helpers to explore the different paths of the Automaton.

Constructor Summary

Constructors

Constructor	Description
GraphTokenStreamFiniteStrings(TokenStream in)

Method Summary

Modifier and Type	Method	Description
int[]	articulationPoints()	Returns the articulation points (or cut vertices) of the graph: https://en.wikipedia.org/wiki/Biconnected_component
Iterator<TokenStream>	getFiniteStrings()	Get all finite strings from the automaton.
Iterator<TokenStream>	getFiniteStrings(int startState, int endState)	Get all finite strings that start at startState and end at endState.
List<AttributeSource>	getTerms(int state)	Returns the list of tokens that start at the provided state
Term[]	getTerms(String field, int state)	Returns the list of terms that start at the provided state
boolean	hasSidePath(int state)	Returns whether the provided state is the start of multiple side paths of different length (eg: new york, ny)

Methods inherited from class java.lang.Object

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

Constructor Details

GraphTokenStreamFiniteStrings

public GraphTokenStreamFiniteStrings(TokenStream in)
                              throws IOException

Throws:

IOException

Method Details

hasSidePath

public boolean hasSidePath(int state)

Returns whether the provided state is the start of multiple side paths of different length (eg: new york, ny)

getTerms

public List<AttributeSource> getTerms(int state)

Returns the list of tokens that start at the provided state

getTerms

public Term[] getTerms(String field,
 int state)

Returns the list of terms that start at the provided state

getFiniteStrings

public Iterator<TokenStream> getFiniteStrings()
                                       throws IOException

Get all finite strings from the automaton.

Throws:

IOException

getFiniteStrings

public Iterator<TokenStream> getFiniteStrings(int startState,
 int endState)

Get all finite strings that start at startState and end at endState.

articulationPoints

public int[] articulationPoints()

Returns the articulation points (or cut vertices) of the graph: https://en.wikipedia.org/wiki/Biconnected_component