org.apache.lucene.codecs.memory

Class FSTOrdTermsReader

java.lang.Object

org.apache.lucene.index.Fields

org.apache.lucene.codecs.FieldsProducer

org.apache.lucene.codecs.memory.FSTOrdTermsReader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, java.lang.Iterable<java.lang.String>, Accountable

public class FSTOrdTermsReader
extends FieldsProducer

FST-based terms dictionary reader. The FST index maps each term and its ord, and during seek the ord is used to fetch metadata from a single block. The term dictionary is fully memory resident.

Nested Class Summary

Nested Classes

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

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.util.TreeMap<java.lang.String,FSTOrdTermsReader.TermsReader>	fields
(package private) static int	INTERVAL
(package private) PostingsReaderBase	postingsReader

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

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor and Description
FSTOrdTermsReader(SegmentReadState state, PostingsReaderBase postingsReader)

Method Summary

Modifier and Type	Method and Description
private void	checkFieldSummary(SegmentInfo info, IndexInput indexIn, IndexInput blockIn, FSTOrdTermsReader.TermsReader field, FSTOrdTermsReader.TermsReader previous)
void	checkIntegrity() Checks consistency of this reader.
void	close()
java.util.Collection<Accountable>	getChildResources() Returns nested resources of this class.
java.util.Iterator<java.lang.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(java.lang.String field) Get the Terms for this field.
java.lang.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 Detail

INTERVAL

static final int INTERVAL

See Also:

Constant Field Values

fields

final java.util.TreeMap<java.lang.String,FSTOrdTermsReader.TermsReader> fields

postingsReader

final PostingsReaderBase postingsReader

Constructor Detail

FSTOrdTermsReader

public FSTOrdTermsReader(SegmentReadState state,
                         PostingsReaderBase postingsReader)
                  throws java.io.IOException

Throws:

java.io.IOException

Method Detail

seekDir

private void seekDir(IndexInput in)
              throws java.io.IOException

Throws:

java.io.IOException

checkFieldSummary

private void checkFieldSummary(SegmentInfo info,
                               IndexInput indexIn,
                               IndexInput blockIn,
                               FSTOrdTermsReader.TermsReader field,
                               FSTOrdTermsReader.TermsReader previous)
                        throws java.io.IOException

Throws:

java.io.IOException

iterator

public java.util.Iterator<java.lang.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 java.lang.Iterable<java.lang.String>

Specified by:

iterator in class Fields

terms

public Terms terms(java.lang.String field)
            throws java.io.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:

java.io.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 java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in class FieldsProducer

Throws:

java.io.IOException

walk

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

Throws:

java.io.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 java.util.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 java.lang.String toString()

Overrides:

toString in class java.lang.Object

checkIntegrity

public void checkIntegrity()
                    throws java.io.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:

java.io.IOException