org.apache.lucene.search
Class CachingSpanFilter

java.lang.Object
  extended by org.apache.lucene.search.Filter
      extended by org.apache.lucene.search.SpanFilter
          extended by org.apache.lucene.search.CachingSpanFilter
All Implemented Interfaces:
Serializable

public class CachingSpanFilter
extends SpanFilter

Wraps another SpanFilter's result and caches it. The purpose is to allow filters to simply filter, and then wrap with this class to add caching.

See Also:
Serialized Form

Constructor Summary
CachingSpanFilter(SpanFilter filter)
          New deletions always result in a cache miss, by default (CachingWrapperFilter.DeletesMode.RECACHE.
CachingSpanFilter(SpanFilter filter, CachingWrapperFilter.DeletesMode deletesMode)
           
 
Method Summary
 SpanFilterResult bitSpans(IndexReader reader)
          Returns a SpanFilterResult with true for documents which should be permitted in search results, and false for those that should not and Spans for where the true docs match.
 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

CachingSpanFilter

public CachingSpanFilter(SpanFilter filter)
New deletions always result in a cache miss, by default (CachingWrapperFilter.DeletesMode.RECACHE.

Parameters:
filter - Filter to cache results of

CachingSpanFilter

public CachingSpanFilter(SpanFilter filter,
                         CachingWrapperFilter.DeletesMode deletesMode)
Parameters:
filter - Filter to cache results of
deletesMode - See CachingWrapperFilter.DeletesMode
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

bitSpans

public SpanFilterResult bitSpans(IndexReader reader)
                          throws IOException
Description copied from class: SpanFilter
Returns a SpanFilterResult with true for documents which should be permitted in search results, and false for those that should not and Spans for where the true docs match.

Specified by:
bitSpans in class SpanFilter
Parameters:
reader - The IndexReader to load position and DocIdSet information from
Returns:
A SpanFilterResult
Throws:
IOException - if there was an issue accessing the necessary information

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


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