org.apache.lucene.search
Class MultiTermQueryWrapperFilter<Q extends MultiTermQuery>

java.lang.Object
  extended by org.apache.lucene.search.Filter
      extended by 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
protected  Q query
           
 
Constructor Summary
protected MultiTermQueryWrapperFilter(Q query)
          Wrap a MultiTermQuery as a Filter.
 
Method Summary
 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


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