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Lucene example source code file (OpenBitSetDISI.java)

This example Lucene source code file (OpenBitSetDISI.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

io, ioexception, ioexception, openbitset, openbitset, openbitsetdisi, openbitsetdisi

The Lucene OpenBitSetDISI.java source code

package org.apache.lucene.util;

/**
 * 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;
import org.apache.lucene.search.DocIdSetIterator;
 
public class OpenBitSetDISI extends OpenBitSet {

  /** Construct an OpenBitSetDISI with its bits set
   * from the doc ids of the given DocIdSetIterator.
   * Also give a maximum size one larger than the largest doc id for which a
   * bit may ever be set on this OpenBitSetDISI.
   */
  public OpenBitSetDISI(DocIdSetIterator disi, int maxSize) throws IOException {
    super(maxSize);
    inPlaceOr(disi);
  }

  /** Construct an OpenBitSetDISI with no bits set, and a given maximum size
   * one larger than the largest doc id for which a bit may ever be set
   * on this OpenBitSetDISI.
   */
  public OpenBitSetDISI(int maxSize) {
    super(maxSize);
  }

  /**
   * Perform an inplace OR with the doc ids from a given DocIdSetIterator,
   * setting the bit for each such doc id.
   * These doc ids should be smaller than the maximum size passed to the
   * constructor.
   */   
  public void inPlaceOr(DocIdSetIterator disi) throws IOException {
    int doc;
    long size = size();
    while ((doc = disi.nextDoc()) < size) {
      fastSet(doc);
    }
  }

  /**
   * Perform an inplace AND with the doc ids from a given DocIdSetIterator,
   * leaving only the bits set for which the doc ids are in common.
   * These doc ids should be smaller than the maximum size passed to the
   * constructor.
   */   
  public void inPlaceAnd(DocIdSetIterator disi) throws IOException {
    int bitSetDoc = nextSetBit(0);
    int disiDoc;
    while (bitSetDoc != -1 && (disiDoc = disi.advance(bitSetDoc)) != DocIdSetIterator.NO_MORE_DOCS) {
      clear(bitSetDoc, disiDoc);
      bitSetDoc = nextSetBit(disiDoc + 1);
    }
    if (bitSetDoc != -1) {
      clear(bitSetDoc, size());
    }
  }

  /**
   * Perform an inplace NOT with the doc ids from a given DocIdSetIterator,
   * clearing all the bits for each such doc id.
   * These doc ids should be smaller than the maximum size passed to the
   * constructor.
   */   
  public void inPlaceNot(DocIdSetIterator disi) throws IOException {
    int doc;
    long size = size();
    while ((doc = disi.nextDoc()) < size) {
      fastClear(doc);
    }
  }

  /**
   * Perform an inplace XOR with the doc ids from a given DocIdSetIterator,
   * flipping all the bits for each such doc id.
   * These doc ids should be smaller than the maximum size passed to the
   * constructor.
   */   
  public void inPlaceXor(DocIdSetIterator disi) throws IOException {
    int doc;
    long size = size();
    while ((doc = disi.nextDoc()) < size) {
      fastFlip(doc);
    }
  }
}

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