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Lucene example source code file (DocInverterPerThread.java)

This example Lucene source code file (DocInverterPerThread.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

docfieldconsumerperfield, docinverter, docinverterperfield, docinverterperthread, docinverterperthread, fieldinvertstate, inverteddocconsumerperthread, io, ioexception, ioexception, override, override, reusablestringreader, singletokenattributesource, singletokenattributesource

The Lucene DocInverterPerThread.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.IOException;

import org.apache.lucene.util.AttributeSource;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;

/** This is a DocFieldConsumer that inverts each field,
 *  separately, from a Document, and accepts a
 *  InvertedTermsConsumer to process those terms. */

final class DocInverterPerThread extends DocFieldConsumerPerThread {
  final DocInverter docInverter;
  final InvertedDocConsumerPerThread consumer;
  final InvertedDocEndConsumerPerThread endConsumer;
  final SingleTokenAttributeSource singleToken = new SingleTokenAttributeSource();
  
  static class SingleTokenAttributeSource extends AttributeSource {
    final CharTermAttribute termAttribute;
    final OffsetAttribute offsetAttribute;
    
    private SingleTokenAttributeSource() {
      termAttribute = addAttribute(CharTermAttribute.class);
      offsetAttribute = addAttribute(OffsetAttribute.class);
    }
    
    public void reinit(String stringValue, int startOffset,  int endOffset) {
      termAttribute.setEmpty().append(stringValue);
      offsetAttribute.setOffset(startOffset, endOffset);
    }
  }
  
  final DocumentsWriter.DocState docState;

  final FieldInvertState fieldState = new FieldInvertState();

  // Used to read a string value for a field
  final ReusableStringReader stringReader = new ReusableStringReader();

  public DocInverterPerThread(DocFieldProcessorPerThread docFieldProcessorPerThread, DocInverter docInverter) {
    this.docInverter = docInverter;
    docState = docFieldProcessorPerThread.docState;
    consumer = docInverter.consumer.addThread(this);
    endConsumer = docInverter.endConsumer.addThread(this);
  }

  @Override
  public void startDocument() throws IOException {
    consumer.startDocument();
    endConsumer.startDocument();
  }

  @Override
  public DocumentsWriter.DocWriter finishDocument() throws IOException {
    // TODO: allow endConsumer.finishDocument to also return
    // a DocWriter
    endConsumer.finishDocument();
    return consumer.finishDocument();
  }

  @Override
  void abort() {
    try {
      consumer.abort();
    } finally {
      endConsumer.abort();
    }
  }

  @Override
  public DocFieldConsumerPerField addField(FieldInfo fi) {
    return new DocInverterPerField(this, fi);
  }
}

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