org.cdlib.xtf.textEngine
Class SpanExactQuery

Object
  Query
      SpanQuery
          SpanExactQuery

All Implemented Interfaces:

Serializable, Cloneable

public class SpanExactQuery
extends SpanQuery

Just like a SpanNearQuery with slop set to zero, except that it also looks for the special 'start-of-field' and 'end-of-field' tokens inserted by the text indexer. Thus, it will match either the entire field, or none of it.

Author:

Martin Haye

See Also:

Serialized Form

Field Summary

private SpanQuery[]

clauses

Constructor Summary

SpanExactQuery(SpanQuery[] clauses)
Construct an exact query on a set of clauses.

Method Summary

SpanQuery[]	getClauses() Return the clauses whose spans are matched.
String	getField() Returns the name of the field matched by this query.
Spans	getSpans(IndexReader reader, Searcher searcher) Iterate all the spans from the text query that match the sectionType query also.
Query[]	getSubQueries() Return all the sub-queries (clauses in our case)
Collection	getTerms() Returns a collection of all terms matched by this query.
Query	rewrite(IndexReader reader)
String	toString(String field)

Methods inherited from class SpanQuery

createWeight, getSpanRecording, setSpanRecording

Methods inherited from class Query

clone, combine, extractTerms, getBoost, getSimilarity, mergeBooleanQueries, setBoost, toString, weight

Methods inherited from class Object

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

Field Detail

clauses

private SpanQuery[] clauses

Constructor Detail

SpanExactQuery

public SpanExactQuery(SpanQuery[] clauses)

Construct an exact query on a set of clauses.

Parameters:

clauses - Clauses to match.

Method Detail

rewrite

public Query rewrite(IndexReader reader)
              throws IOException

Overrides:

rewrite in class Query

Throws:

IOException

getClauses

public SpanQuery[] getClauses()

Return the clauses whose spans are matched.

getSubQueries

public Query[] getSubQueries()

Return all the sub-queries (clauses in our case)

getSpans

public Spans getSpans(IndexReader reader,
                      Searcher searcher)
               throws IOException

Iterate all the spans from the text query that match the sectionType query also.

Specified by:

getSpans in class SpanQuery

Throws:

IOException

getField

public String getField()

Description copied from class: SpanQuery

Returns the name of the field matched by this query.

Specified by:

getField in class SpanQuery

getTerms

public Collection getTerms()

Description copied from class: SpanQuery

Returns a collection of all terms matched by this query.

Specified by:

getTerms in class SpanQuery

toString

public String toString(String field)

Specified by:

toString in class Query