BitSetPurgeFilter.java example

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/**
 * This software is licensed to you under the Apache License, Version 2.0 (the
 * "Apache License").
 *
 * LinkedIn's contributions are made under the Apache License. If you contribute
 * to the Software, the contributions will be deemed to have been made under the
 * Apache License, unless you expressly indicate otherwise. Please do not make any
 * contributions that would be inconsistent with the Apache License.
 *
 * You may obtain a copy of the Apache License at http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, this software
 * distributed under the Apache License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache
 * License for the specific language governing permissions and limitations for the
 * software governed under the Apache License.
 *
 * © 2012 LinkedIn Corp. All Rights Reserved.  
 */
package com.senseidb.gateway.file;

import java.io.IOException;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;

import com.browseengine.bobo.docidset.BitsetDocSet;

public class BitSetPurgeFilter extends Filter {

  @Override
  public DocIdSet getDocIdSet(IndexReader reader) throws IOException {    
    BitsetDocSet bitsetDocSet = new BitsetDocSet();
    bitsetDocSet.addDoc(0);
    return bitsetDocSet;
  }

}