org.apache.lucene.codecs
Class BlockTermsReader

java.lang.Object
  org.apache.lucene.index.Fields
      org.apache.lucene.codecs.FieldsProducer
          org.apache.lucene.codecs.BlockTermsReader

All Implemented Interfaces:

Closeable

public class BlockTermsReader
extends FieldsProducer

Handles a terms dict, but decouples all details of doc/freqs/positions reading to an instance of PostingsReaderBase. This class is reusable for codecs that use a different format for docs/freqs/positions (though codecs are also free to make their own terms dict impl).

This class also interacts with an instance of TermsIndexReaderBase, to abstract away the specific implementation of the terms dict index.

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

Field Summary

protected long

dirOffset

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

EMPTY_ARRAY

Constructor Summary

BlockTermsReader(TermsIndexReaderBase indexReader, Directory dir, FieldInfos fieldInfos, String segment, PostingsReaderBase postingsReader, IOContext context, int termsCacheSize, String segmentSuffix)

Method Summary

void	close()
FieldsEnum	iterator() Returns an iterator that will step through all fields names.
protected void	readHeader(IndexInput input)
protected void	seekDir(IndexInput input, long dirOffset)
int	size() Returns the number of terms for all fields, or -1 if this measure isn't stored by the codec.
Terms	terms(String field) Get the Terms for this field.

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

getUniqueTermCount

Methods inherited from class java.lang.Object

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

Field Detail

dirOffset

protected long dirOffset

Constructor Detail

BlockTermsReader

public BlockTermsReader(TermsIndexReaderBase indexReader,
                        Directory dir,
                        FieldInfos fieldInfos,
                        String segment,
                        PostingsReaderBase postingsReader,
                        IOContext context,
                        int termsCacheSize,
                        String segmentSuffix)
                 throws IOException

Throws:

IOException

Method Detail

readHeader

protected void readHeader(IndexInput input)
                   throws IOException

Throws:

IOException

seekDir

protected void seekDir(IndexInput input,
                       long dirOffset)
                throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class FieldsProducer

Throws:

IOException

iterator

public FieldsEnum 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 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 terms for all fields, or -1 if this measure isn't stored by the codec. Note that, just like other term measures, this measure does not take deleted documents into account.

Specified by:

size in class Fields