org.apache.lucene.search.spans

Class SpanNearQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.spans.SpanQuery

org.apache.lucene.search.spans.SpanNearQuery

All Implemented Interfaces:

Serializable, Cloneable

public class SpanNearQuery
extends SpanQuery

Matches spans which are near one another. One can specify slop, the maximum number of intervening unmatched positions, as well as whether matches are required to be in-order.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SpanNearQuery(SpanQuery[] clauses, int slop, boolean inOrder) Construct a SpanNearQuery.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o) Returns true iff o is equal to this.
void	extractTerms(Set terms) Expert: adds all terms occuring in this query to the terms set.
SpanQuery[]	getClauses() Return the clauses whose spans are matched.
String	getField() Returns the name of the field matched by this query.
PayloadSpans	getPayloadSpans(IndexReader reader) Returns the matches for this query in an index, including access to any Payloads at those positions.
int	getSlop() Return the maximum number of intervening unmatched positions permitted.
Spans	getSpans(IndexReader reader) Expert: Returns the matches for this query in an index.
Collection	getTerms() Deprecated. use extractTerms instead
int	hashCode()
boolean	isInOrder() Return true if matches are required to be in-order.
Query	rewrite(IndexReader reader) Expert: called to re-write queries into primitive queries.
String	toString(String field) Prints a query to a string, with field assumed to be the default field and omitted.

Methods inherited from class org.apache.lucene.search.spans.SpanQuery

createWeight

Methods inherited from class org.apache.lucene.search.Query

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

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SpanNearQuery

public SpanNearQuery(SpanQuery[] clauses,
             int slop,
             boolean inOrder)

Construct a SpanNearQuery. Matches spans matching a span from each clause, with up to slop total unmatched positions between them. * When inOrder is true, the spans from each clause must be * ordered as in clauses.

Method Detail

getClauses

public SpanQuery[] getClauses()

Return the clauses whose spans are matched.

getSlop

public int getSlop()

Return the maximum number of intervening unmatched positions permitted.

isInOrder

public boolean isInOrder()

Return true if matches are required to be in-order.

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()

Deprecated. use extractTerms instead

Returns a collection of all terms matched by this query.

Specified by:

getTerms in class SpanQuery

See Also:

extractTerms(Set)

extractTerms

public void extractTerms(Set terms)

Description copied from class: Query

Expert: adds all terms occuring in this query to the terms set. Only works if this query is in its rewritten form.

Overrides:

extractTerms in class Query

toString

public String toString(String field)

Description copied from class: Query

Prints a query to a string, with field assumed to be the default field and omitted.

The representation used is one that is supposed to be readable by QueryParser. However, there are the following limitations:

• If the query was created by the parser, the printed representation may not be exactly what was parsed. For example, characters that need to be escaped will be represented without the required backslash.
• Some of the more complicated queries (e.g. span queries) don't have a representation that can be parsed by QueryParser.

Specified by:

toString in class Query

getSpans

public Spans getSpans(IndexReader reader)
               throws IOException

Description copied from class: SpanQuery

Expert: Returns the matches for this query in an index. Used internally to search for spans.

Specified by:

getSpans in class SpanQuery

Throws:

IOException

getPayloadSpans

public PayloadSpans getPayloadSpans(IndexReader reader)
                             throws IOException

Description copied from class: SpanQuery

Returns the matches for this query in an index, including access to any Payloads at those positions. Implementing classes that want access to the payloads will need to implement this.

Overrides:

getPayloadSpans in class SpanQuery

Parameters:

reader - The IndexReader to use to get spans/payloads

Returns:

null

Throws:

IOException - if there is an error accessing the payload WARNING: The status of the Payloads feature is experimental. The APIs introduced here might change in the future and will not be supported anymore in such a case.

rewrite

public Query rewrite(IndexReader reader)
              throws IOException

Description copied from class: Query

Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.

Overrides:

rewrite in class Query

Throws:

IOException

equals

public boolean equals(Object o)

Returns true iff o is equal to this.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object