Package org.apache.lucene.search

Class MultiTermQueryWrapperFilter<Q extends MultiTermQuery>

java.lang.Object

org.apache.lucene.search.Filter

org.apache.lucene.search.MultiTermQueryWrapperFilter<Q>

Direct Known Subclasses:

NumericRangeFilter, PrefixFilter, TermRangeFilter

public class MultiTermQueryWrapperFilter<Q extends MultiTermQuery>
extends Filter

A wrapper for MultiTermQuery, that exposes its functionality as a Filter.

MultiTermQueryWrapperFilter is not designed to be used by itself. Normally you subclass it to provide a Filter counterpart for a MultiTermQuery subclass.

For example, TermRangeFilter and PrefixFilter extend MultiTermQueryWrapperFilter. This class also provides the functionality behind MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE; this is why it is not abstract.

Field Summary

Fields

Modifier and Type	Field	Description
protected Q	query

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	MultiTermQueryWrapperFilter(Q query)	Wrap a MultiTermQuery as a Filter.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
DocIdSet	getDocIdSet(AtomicReaderContext context, Bits acceptDocs)	Returns a DocIdSet with documents that should be permitted in search results.
String	getField()	Returns the field name for this query
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

query

protected final Q extends MultiTermQuery query

Constructor Detail

MultiTermQueryWrapperFilter

protected MultiTermQueryWrapperFilter(Q query)

Wrap a MultiTermQuery as a Filter.

Method Detail

toString

public String toString()

Overrides:

toString in class Object

equals

public final boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public final int hashCode()

Overrides:

hashCode in class Object

getField

public final String getField()

Returns the field name for this query

getDocIdSet

public DocIdSet getDocIdSet(AtomicReaderContext context,
                            Bits acceptDocs)
                     throws IOException

Returns a DocIdSet with documents that should be permitted in search results.

Specified by:

getDocIdSet in class Filter

Parameters:

context - a AtomicReaderContext instance opened on the index currently searched on. Note, it is likely that the provided reader info does not represent the whole underlying index i.e. if the index has more than one segment the given reader only represents a single segment. The provided context is always an atomic context, so you can call AtomicReader.fields() on the context's reader, for example.

acceptDocs - Bits that represent the allowable docs to match (typically deleted docs but possibly filtering other documents)

Returns:

a DocIdSet that provides the documents which should be permitted or prohibited in search results. NOTE: null should be returned if the filter doesn't accept any documents otherwise internal optimization might not apply in the case an empty DocIdSet is returned.

Throws:

IOException