org.apache.lucene.search
Class QueryWrapperFilter

java.lang.Object
  org.apache.lucene.search.Filter
      org.apache.lucene.search.QueryWrapperFilter

All Implemented Interfaces:

Serializable

public class QueryWrapperFilter
extends Filter

Constrains search results to only match those which also match a provided query.

This could be used, for example, with a TermRangeQuery on a suitably formatted date field to implement date filtering. One could re-use a single QueryFilter that matches, e.g., only documents modified within the last week. The QueryFilter and TermRangeQuery would only need to be reconstructed once per day.

See Also:

Serialized Form

Constructor Summary

QueryWrapperFilter(Query query)
Constructs a filter which only matches documents matching query.

Method Summary

boolean	equals(Object o)
DocIdSet	getDocIdSet(IndexReader reader) Creates a DocIdSet enumerating the documents that should be permitted in search results.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryWrapperFilter

public QueryWrapperFilter(Query query)

Constructs a filter which only matches documents matching query.

Method Detail

getDocIdSet

public DocIdSet getDocIdSet(IndexReader reader)
                     throws IOException

Description copied from class: Filter

Creates a DocIdSet enumerating the documents that should be permitted in search results. NOTE: null can be returned if no documents are accepted by this Filter.

Note: This method will be called once per segment in the index during searching. The returned DocIdSet must refer to document IDs for that segment, not for the top-level reader.

Specified by:

getDocIdSet in class Filter

Parameters:

reader - a IndexReader instance opened on the index currently searched on. Note, it is likely that the provided reader 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.

Returns:

a DocIdSet that provides the documents which should be permitted or prohibited in search results. NOTE: null can be returned if no documents will be accepted by this Filter.

Throws:

IOException

See Also:

DocIdBitSet

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object