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Lucene example source code file (SegmentWriteState.java)

This example Lucene source code file (SegmentWriteState.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

bitvector, buffereddeletes, buffereddeletes, directory, fieldinfos, fieldinfos, io, printstream, segmentwritestate, segmentwritestate, string, string

The Lucene SegmentWriteState.java source code

package org.apache.lucene.index;

/**
 * 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.PrintStream;

import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BitVector;

/**
 * @lucene.experimental
 */
public class SegmentWriteState {
  public final PrintStream infoStream;
  public final Directory directory;
  public final String segmentName;
  public final FieldInfos fieldInfos;
  public final int numDocs;
  public boolean hasVectors;

  // Deletes to apply while we are flushing the segment.  A
  // Term is enrolled in here if it was deleted at one
  // point, and it's mapped to the docIDUpto, meaning any
  // docID < docIDUpto containing this term should be
  // deleted.
  public final BufferedDeletes segDeletes;

  // Lazily created:
  public BitVector deletedDocs;

  /** Expert: The fraction of terms in the "dictionary" which should be stored
   * in RAM.  Smaller values use more memory, but make searching slightly
   * faster, while larger values use less memory and make searching slightly
   * slower.  Searching is typically not dominated by dictionary lookup, so
   * tweaking this is rarely useful.*/
  public final int termIndexInterval;

  /** Expert: The fraction of TermDocs entries stored in skip tables,
   * used to accelerate {@link TermDocs#skipTo(int)}.  Larger values result in
   * smaller indexes, greater acceleration, but fewer accelerable cases, while
   * smaller values result in bigger indexes, less acceleration and more
   * accelerable cases. More detailed experiments would be useful here. */
  public final int skipInterval = 16;
  
  /** Expert: The maximum number of skip levels. Smaller values result in 
   * slightly smaller indexes, but slower skipping in big posting lists.
   */
  public final int maxSkipLevels = 10;

  public SegmentWriteState(PrintStream infoStream, Directory directory, String segmentName, FieldInfos fieldInfos,
                           int numDocs, int termIndexInterval, BufferedDeletes segDeletes) {
    this.infoStream = infoStream;
    this.segDeletes = segDeletes;
    this.directory = directory;
    this.segmentName = segmentName;
    this.fieldInfos = fieldInfos;
    this.numDocs = numDocs;
    this.termIndexInterval = termIndexInterval;
  }
}

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