Package org.apache.lucene.util.automaton

Class CompiledAutomaton

java.lang.Object

org.apache.lucene.util.automaton.CompiledAutomaton

public class CompiledAutomaton
extends Object

Immutable class holding compiled details for a given Automaton. The Automaton is deterministic, must not have dead states but is not necessarily minimal.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CompiledAutomaton.AUTOMATON_TYPE	Automata are compiled into different internal forms for the most efficient execution depending upon the language they accept.

Field Summary

Fields

Modifier and Type	Field	Description
BytesRef	commonSuffixRef	Shared common suffix accepted by the automaton.
Boolean	finite	Indicates if the automaton accepts a finite set of strings.
ByteRunAutomaton	runAutomaton	Matcher for quickly determining if a byte[] is accepted.
Transition[][]	sortedTransitions	Two dimensional array of transitions, indexed by state number for traversal.
BytesRef	term	For CompiledAutomaton.AUTOMATON_TYPE.PREFIX, this is the prefix term; for CompiledAutomaton.AUTOMATON_TYPE.SINGLE this is the singleton term.
CompiledAutomaton.AUTOMATON_TYPE	type

Constructor Summary

Constructors

Constructor	Description
CompiledAutomaton(Automaton automaton)
CompiledAutomaton(Automaton automaton, Boolean finite, boolean simplify)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
BytesRef	floor(BytesRef input, BytesRef output)	Finds largest term accepted by this Automaton, that's <= the provided input term.
TermsEnum	getTermsEnum(Terms terms)
int	hashCode()
String	toDot()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

type

public final CompiledAutomaton.AUTOMATON_TYPE type

term

public final BytesRef term

For CompiledAutomaton.AUTOMATON_TYPE.PREFIX, this is the prefix term; for CompiledAutomaton.AUTOMATON_TYPE.SINGLE this is the singleton term.

runAutomaton

public final ByteRunAutomaton runAutomaton

Matcher for quickly determining if a byte[] is accepted. only valid for CompiledAutomaton.AUTOMATON_TYPE.NORMAL.

sortedTransitions

public final Transition[][] sortedTransitions

Two dimensional array of transitions, indexed by state number for traversal. The state numbering is consistent with runAutomaton. Only valid for CompiledAutomaton.AUTOMATON_TYPE.NORMAL.

commonSuffixRef

public final BytesRef commonSuffixRef

Shared common suffix accepted by the automaton. Only valid for CompiledAutomaton.AUTOMATON_TYPE.NORMAL, and only when the automaton accepts an infinite language.

finite

public final Boolean finite

Indicates if the automaton accepts a finite set of strings. Null if this was not computed. Only valid for CompiledAutomaton.AUTOMATON_TYPE.NORMAL.

Constructor Detail

CompiledAutomaton

public CompiledAutomaton(Automaton automaton)

CompiledAutomaton

public CompiledAutomaton(Automaton automaton,
                         Boolean finite,
                         boolean simplify)

Method Detail

getTermsEnum

public TermsEnum getTermsEnum(Terms terms)
                       throws IOException

Throws:

IOException

floor

public BytesRef floor(BytesRef input,
                      BytesRef output)

Finds largest term accepted by this Automaton, that's <= the provided input term. The result is placed in output; it's fine for output and input to point to the same BytesRef. The returned result is either the provided output, or null if there is no floor term (ie, the provided input term is before the first term accepted by this Automaton).

toDot

public String toDot()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object