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

Direct Known Subclasses:

PayloadNearQuery

public class SpanNearQuery
extends SpanQuery
implements Cloneable

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

Field Summary

Fields

Modifier and Type	Field and Description
protected List<SpanQuery>	clauses
protected String	field
protected boolean	inOrder
protected int	slop

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone() Returns a clone of this query.
boolean	equals(Object o) Returns true iff o is equal to this.
void	extractTerms(Set<Term> terms) Expert: adds all terms occurring 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.
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.
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

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

Methods inherited from class java.lang.Object

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

Field Detail

clauses

protected List<SpanQuery> clauses

slop

protected int slop

inOrder

protected boolean inOrder

field

protected String field

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.

Parameters:

clauses - the clauses to find near each other

slop - The slop value

inOrder - true if order is important

SpanNearQuery

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

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

extractTerms

public void extractTerms(Set<Term> terms)

Description copied from class: Query

Expert: adds all terms occurring 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

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

clone

public Object clone()

Description copied from class: Query

Returns a clone of this query.

Overrides:

clone in class Query

equals

public boolean equals(Object o)

Returns true iff o is equal to this.

Overrides:

equals in class Query

hashCode

public int hashCode()

Overrides:

hashCode in class Query