here it is: DocIdSet.EMPTY_DOCIDSET
/** An empty {...@code DocIdSet} instance for easy use (this is currently
* implemented using a {...@link SortedVIntList}). */
On Mon, Jul 27, 2009 at 6:18 AM, Uwe Schindler<u...@thetaphi.de> wrote:
> Why do we need this class? There is already a static final empty iterator
> available in DocIdSetIterator.EMPTY_DOCIDSET_ITERATOR (or something like
> that name)?
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: u...@thetaphi.de
>
>> From: mikemcc...@apache.org [mailto:mikemcc...@apache.org]
>> Sent: Monday, July 27, 2009 12:03 PM
>> To: java-comm...@lucene.apache.org
>> Subject: svn commit: r798091 -
>> /lucene/java/trunk/src/java/org/apache/lucene/search/EmptyDocIdSetIterator
>> .java
>>
>> Author: mikemccand
>> Date: Mon Jul 27 10:02:34 2009
>> New Revision: 798091
>>
>> URL: http://svn.apache.org/viewvc?rev=798091&view=rev
>> Log:
>> LUCENE-1754: add EmptyDocIdSetIterator
>>
>> Added:
>>
>> lucene/java/trunk/src/java/org/apache/lucene/search/EmptyDocIdSetIterator.
>> java (with props)
>>
>> Added:
>> lucene/java/trunk/src/java/org/apache/lucene/search/EmptyDocIdSetIterator.
>> java
>> URL:
>> http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/
>> search/EmptyDocIdSetIterator.java?rev=798091&view=auto
>> ==========================================================================
>> ====
>> ---
>> lucene/java/trunk/src/java/org/apache/lucene/search/EmptyDocIdSetIterator.
>> java (added)
>> +++
>> lucene/java/trunk/src/java/org/apache/lucene/search/EmptyDocIdSetIterator.
>> java Mon Jul 27 10:02:34 2009
>> @@ -0,0 +1,42 @@
>> +package org.apache.lucene.search;
>> +
>> +/**
>> + * Licensed to the Apache Software Foundation (ASF) under one or more
>> + * contributor license agreements. See the NOTICE file distributed with
>> + * this work for additional information regarding copyright ownership.
>> + * The ASF licenses this file to You under the Apache License, Version
>> 2.0
>> + * (the "License"); you may not use this file except in compliance with
>> + * the License. You may obtain a copy of the License at
>> + *
>> + * http://www.apache.org/licenses/LICENSE-2.0
>> + *
>> + * Unless required by applicable law or agreed to in writing, software
>> + * distributed under the License is distributed on an "AS IS" BASIS,
>> + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
>> implied.
>> + * See the License for the specific language governing permissions and
>> + * limitations under the License.
>> + */
>> +
>> +import java.io.IOException;
>> +
>> +/**
>> + * An empty implementation for {...@link DocIdSetIterator}. This can be used
>> by
>> + * classes which receive a null {...@link DocIdSet} from
>> + * {...@link Filter#getDocIdSet(org.apache.lucene.index.IndexReader)}.
>> + */
>> +public final class EmptyDocIdSetIterator extends DocIdSetIterator {
>> +
>> + private static final DocIdSetIterator instance = new
>> EmptyDocIdSetIterator();
>> +
>> + public static DocIdSetIterator getInstance() { return instance; }
>> +
>> + // to prevent instantiation
>> + private EmptyDocIdSetIterator() { }
>> +
>> + public int advance(int target) throws IOException { return
>> NO_MORE_DOCS; }
>> +
>> + public int docID() { return NO_MORE_DOCS; }
>> +
>> + public int nextDoc() throws IOException { return NO_MORE_DOCS; }
>> +
>> +}
>>
>> Propchange:
>> lucene/java/trunk/src/java/org/apache/lucene/search/EmptyDocIdSetIterator.
>> java
>> --------------------------------------------------------------------------
>> ----
>> svn:eol-style = native
>>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org
> For additional commands, e-mail: java-dev-h...@lucene.apache.org
>
>
--
Robert Muir
rcm...@gmail.com
---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-dev-h...@lucene.apache.org
