org.apache.lucene.util.automaton

Class RunAutomaton

java.lang.Object

org.apache.lucene.util.automaton.RunAutomaton

All Implemented Interfaces:

Accountable

Direct Known Subclasses:

ByteRunAutomaton, CharacterRunAutomaton

public abstract class RunAutomaton
extends Object
implements Accountable

Finite-state automaton with fast run operation. The initial state is always 0.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RunAutomaton(Automaton a, int alphabetSize) Constructs a new RunAutomaton from a deterministic Automaton.
protected	RunAutomaton(Automaton a, int alphabetSize, int maxDeterminizedStates) Constructs a new RunAutomaton from a deterministic Automaton.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
int[]	getCharIntervals() Returns array of codepoint class interval start points.
int	getSize() Returns number of states in automaton.
int	hashCode()
boolean	isAccept(int state) Returns acceptance status for given state.
long	ramBytesUsed() Return the memory usage of this object in bytes.
int	step(int state, int c) Returns the state obtained by reading the given char from the given state.
String	toString() Returns a string representation of this automaton.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.lucene.util.Accountable

getChildResources

Constructor Detail

RunAutomaton

protected RunAutomaton(Automaton a,
                       int alphabetSize)

Constructs a new RunAutomaton from a deterministic Automaton.

Parameters:

a - an automaton

RunAutomaton

protected RunAutomaton(Automaton a,
                       int alphabetSize,
                       int maxDeterminizedStates)

Constructs a new RunAutomaton from a deterministic Automaton.

Parameters:

a - an automaton

maxDeterminizedStates - maximum number of states that can be created while determinizing a

Method Detail

toString

public String toString()

Returns a string representation of this automaton.

Overrides:

toString in class Object

getSize

public final int getSize()

Returns number of states in automaton.

isAccept

public final boolean isAccept(int state)

Returns acceptance status for given state.

getCharIntervals

public final int[] getCharIntervals()

Returns array of codepoint class interval start points. The array should not be modified by the caller.

step

public final int step(int state,
                      int c)

Returns the state obtained by reading the given char from the given state. Returns -1 if not obtaining any such state. (If the original Automaton had no dead states, -1 is returned here if and only if a dead state is entered in an equivalent automaton with a total transition function.)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

ramBytesUsed

public long ramBytesUsed()

Description copied from interface: Accountable

Return the memory usage of this object in bytes. Negative values are illegal.

Specified by:

ramBytesUsed in interface Accountable