org.apache.solr.spelling.suggest.fst
Class FSTLookupFactory

java.lang.Object
  org.apache.solr.spelling.suggest.LookupFactory
      org.apache.solr.spelling.suggest.fst.FSTLookupFactory

public class FSTLookupFactory
extends LookupFactory

Factory for FSTCompletionLookup

Field Summary

static String	EXACT_MATCH_FIRST If true, exact suggestions are returned first, even if they are prefixes of other strings in the automaton (possibly with larger weights).
static String	WEIGHT_BUCKETS The number of separate buckets for weights (discretization).

Fields inherited from class org.apache.solr.spelling.suggest.LookupFactory

DEFAULT_FILE_BASED_DICT

Constructor Summary

FSTLookupFactory()

Method Summary

Lookup	create(NamedList params, SolrCore core) Create a Lookup using config options in params and current core
String	storeFileName() Returns the filename in which the in-memory data structure is stored

Methods inherited from class java.lang.Object

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

Field Detail

WEIGHT_BUCKETS

public static final String WEIGHT_BUCKETS

The number of separate buckets for weights (discretization). The more buckets, the more fine-grained term weights (priorities) can be assigned. The speed of lookup will not decrease for prefixes which have highly-weighted completions (because these are filled-in first), but will decrease significantly for low-weighted terms (but these should be infrequent, so it is all right).

The number of buckets must be within [1, 255] range.

See Also:

Constant Field Values

EXACT_MATCH_FIRST

public static final String EXACT_MATCH_FIRST

If true, exact suggestions are returned first, even if they are prefixes of other strings in the automaton (possibly with larger weights).

See Also:

Constant Field Values

Constructor Detail

FSTLookupFactory

public FSTLookupFactory()

Method Detail

create

public Lookup create(NamedList params,
                     SolrCore core)

Description copied from class: LookupFactory

Create a Lookup using config options in params and current core

Specified by:

create in class LookupFactory

storeFileName

public String storeFileName()

Description copied from class: LookupFactory

Returns the filename in which the in-memory data structure is stored

NOTE: not all Lookup implementations store in-memory data structures

Specified by:

storeFileName in class LookupFactory