morfologik.fsa.builders

Class FSAUtils

java.lang.Object

morfologik.fsa.builders.FSAUtils

public final class FSAUtils
extends Object

Other FSA-related utilities not directly associated with the class hierarchy.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FSAUtils.IntIntHolder

Constructor Summary

Constructors

Constructor and Description
FSAUtils()

Method Summary

Modifier and Type	Method and Description
static TreeMap<Integer,Integer>	calculateFanOuts(FSA fsa, int root) Calculate fan-out ratio (how many nodes have a given number of outgoing arcs).
static com.carrotsearch.hppc.IntIntHashMap	rightLanguageForAllStates(FSA fsa) Calculate the size of "right language" for each state in an FSA.
static String	toDot(FSA fsa, int node) Returns the right-language reachable from a given FSA node, formatted as an input for the graphviz package (expressed in the dot language).
static void	toDot(Writer w, FSA fsa, int node) Saves the right-language reachable from a given FSA node, formatted as an input for the graphviz package (expressed in the dot language), to the given writer.

Methods inherited from class java.lang.Object

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

Constructor Detail

FSAUtils

public FSAUtils()

Method Detail

toDot

public static String toDot(FSA fsa,
                           int node)

Returns the right-language reachable from a given FSA node, formatted as an input for the graphviz package (expressed in the dot language).

Parameters:

fsa - The automaton to visualize.

node - Starting node (subgraph will be visualized unless it's the automaton's root node).

Returns:

Returns the dot language description of the automaton.

toDot

public static void toDot(Writer w,
                         FSA fsa,
                         int node)
                  throws IOException

Saves the right-language reachable from a given FSA node, formatted as an input for the graphviz package (expressed in the dot language), to the given writer.

Parameters:

w - The writer to write dot language description of the automaton.

fsa - The automaton to visualize.

node - Starting node (subgraph will be visualized unless it's the automaton's root node).

Throws:

IOException - Rethrown if an I/O exception occurs.

calculateFanOuts

public static TreeMap<Integer,Integer> calculateFanOuts(FSA fsa,
                                                        int root)

Calculate fan-out ratio (how many nodes have a given number of outgoing arcs).

Parameters:

fsa - The automaton to calculate fanout for.

root - The starting node for calculations.

Returns:

The returned map contains keys for the number of outgoing arcs and an associated value being the number of nodes with that arc number.

rightLanguageForAllStates

public static com.carrotsearch.hppc.IntIntHashMap rightLanguageForAllStates(FSA fsa)

Calculate the size of "right language" for each state in an FSA. The right language is the number of sequences encoded from a given node in the automaton.

Parameters:

fsa - The automaton to calculate right language for.

Returns:

Returns a map with node identifiers as keys and their right language counts as associated values.