Package org.apache.lucene.codecs.memory

Class FSTTermsReader

java.lang.Object

org.apache.lucene.index.Fields

org.apache.lucene.codecs.FieldsProducer

org.apache.lucene.codecs.memory.FSTTermsReader

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<String>, Accountable

public class FSTTermsReader
extends FieldsProducer

FST-based terms dictionary reader. The FST directly maps each term and its metadata, it is memory resident.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) final class	FSTTermsReader.TermsReader

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	BASE_RAM_BYTES_USED
(package private) final TreeMap<String,FSTTermsReader.TermsReader>	fields
(package private) final PostingsReaderBase	postingsReader

Fields inherited from class org.apache.lucene.index.Fields

EMPTY_ARRAY

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

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Constructor	Description
FSTTermsReader(SegmentReadState state, PostingsReaderBase postingsReader)

Method Summary

Modifier and Type	Method	Description
private void	checkFieldSummary(SegmentInfo info, IndexInput in, FSTTermsReader.TermsReader field, FSTTermsReader.TermsReader previous)
void	checkIntegrity()	Checks consistency of this reader.
void	close()
Collection<Accountable>	getChildResources()	Returns nested resources of this class.
Iterator<String>	iterator()	Returns an iterator that will step through all fields names.
long	ramBytesUsed()	Return the memory usage of this object in bytes.
private void	seekDir(IndexInput in)
int	size()	Returns the number of fields or -1 if the number of distinct field names is unknown.
Terms	terms(String field)	Get the Terms for this field.
String	toString()
(package private) static <T> void	walk(FST<T> fst)

Methods inherited from class org.apache.lucene.codecs.FieldsProducer

getMergeInstance

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Details

fields

final TreeMap<String,FSTTermsReader.TermsReader> fields

postingsReader

final PostingsReaderBase postingsReader

BASE_RAM_BYTES_USED

private static final long BASE_RAM_BYTES_USED

Constructor Details

FSTTermsReader

public FSTTermsReader(SegmentReadState state,
 PostingsReaderBase postingsReader)
               throws IOException

Throws:

IOException

Method Details

seekDir

private void seekDir(IndexInput in)
              throws IOException

Throws:

IOException

checkFieldSummary

private void checkFieldSummary(SegmentInfo info,
 IndexInput in,
 FSTTermsReader.TermsReader field,
 FSTTermsReader.TermsReader previous)
                        throws IOException

Throws:

IOException

iterator

public Iterator<String> iterator()

Description copied from class: Fields

Returns an iterator that will step through all fields names. This will not return null.

Specified by:

iterator in interface Iterable<String>

Specified by:

iterator in class Fields

terms

public Terms terms(String field)
            throws IOException

Description copied from class: Fields

Get the Terms for this field. This will return null if the field does not exist.

Specified by:

terms in class Fields

Throws:

IOException

size

public int size()

Description copied from class: Fields

Returns the number of fields or -1 if the number of distinct field names is unknown. If >= 0, Fields.iterator() will return as many field names.

Specified by:

size in class Fields

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class FieldsProducer

Throws:

IOException

walk

static <T> void walk(FST<T> fst)
              throws IOException

Throws:

IOException

ramBytesUsed

public long ramBytesUsed()

Description copied from interface: Accountable

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

getChildResources

public Collection<Accountable> getChildResources()

Description copied from interface: Accountable

Returns nested resources of this class. The result should be a point-in-time snapshot (to avoid race conditions).

See Also:

• Accountables

toString

public String toString()

Overrides:

toString in class Object

checkIntegrity

public void checkIntegrity()
                    throws IOException

Description copied from class: FieldsProducer

Checks consistency of this reader.

Note that this may be costly in terms of I/O, e.g. may involve computing a checksum value against large data files.

Specified by:

checkIntegrity in class FieldsProducer

Throws:

IOException