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Lucene example source code file (DocInverter.java)

This example Lucene source code file (DocInverter.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

collection, collection, docinverter, docinverterperfield, docinverterperfield, docinverterperthread, docinverterperthread, hashmap, hashset, inverteddocendconsumer, io, ioexception, map, override, override, util

The Lucene DocInverter.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 java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;

import java.util.Map;


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

final class DocInverter extends DocFieldConsumer {

  final InvertedDocConsumer consumer;
  final InvertedDocEndConsumer endConsumer;

  public DocInverter(InvertedDocConsumer consumer, InvertedDocEndConsumer endConsumer) {
    this.consumer = consumer;
    this.endConsumer = endConsumer;
  }

  @Override
  void setFieldInfos(FieldInfos fieldInfos) {
    super.setFieldInfos(fieldInfos);
    consumer.setFieldInfos(fieldInfos);
    endConsumer.setFieldInfos(fieldInfos);
  }

  @Override
  void flush(Map<DocFieldConsumerPerThread, Collection threadsAndFields, SegmentWriteState state) throws IOException {

    Map<InvertedDocConsumerPerThread,Collection childThreadsAndFields = new HashMap>();
    Map<InvertedDocEndConsumerPerThread,Collection endChildThreadsAndFields = new HashMap>();

    for (Map.Entry<DocFieldConsumerPerThread,Collection entry : threadsAndFields.entrySet() ) {
      DocInverterPerThread perThread = (DocInverterPerThread) entry.getKey();

      Collection<InvertedDocConsumerPerField> childFields = new HashSet();
      Collection<InvertedDocEndConsumerPerField> endChildFields = new HashSet();
      for (final DocFieldConsumerPerField field: entry.getValue() ) {  
        DocInverterPerField perField = (DocInverterPerField) field;
        childFields.add(perField.consumer);
        endChildFields.add(perField.endConsumer);
      }

      childThreadsAndFields.put(perThread.consumer, childFields);
      endChildThreadsAndFields.put(perThread.endConsumer, endChildFields);
    }
    
    consumer.flush(childThreadsAndFields, state);
    endConsumer.flush(endChildThreadsAndFields, state);
  }

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

  @Override
  public boolean freeRAM() {
    return consumer.freeRAM();
  }

  @Override
  public DocFieldConsumerPerThread addThread(DocFieldProcessorPerThread docFieldProcessorPerThread) {
    return new DocInverterPerThread(docFieldProcessorPerThread, this);
  }
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene DocInverter.java source code file:



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