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Lucene example source code file (DocFieldProcessor.java)

This example Lucene source code file (DocFieldProcessor.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, docconsumerperthread, docfieldconsumer, docfieldprocessor, docfieldprocessorperthread, docfieldprocessorperthread, documentswriter, io, ioexception, ioexception, override, override, storedfieldswriter, storedfieldswriter, string, util

The Lucene DocFieldProcessor.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,
 * 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.Map;
import java.util.HashMap;

 * This is a DocConsumer that gathers all fields under the
 * same name, and calls per-field consumers to process field
 * by field.  This class doesn't doesn't do any "real" work
 * of its own: it just forwards the fields to a
 * DocFieldConsumer.

final class DocFieldProcessor extends DocConsumer {

  final DocumentsWriter docWriter;
  final FieldInfos fieldInfos;
  final DocFieldConsumer consumer;
  final StoredFieldsWriter fieldsWriter;

  public DocFieldProcessor(DocumentsWriter docWriter, DocFieldConsumer consumer) {
    this.docWriter = docWriter;
    this.consumer = consumer;
    fieldInfos = docWriter.getFieldInfos();
    fieldsWriter = new StoredFieldsWriter(docWriter, fieldInfos);

  public void flush(Collection<DocConsumerPerThread> threads, SegmentWriteState state) throws IOException {

    Map<DocFieldConsumerPerThread, Collection childThreadsAndFields = new HashMap>();
    for ( DocConsumerPerThread thread : threads) {
      DocFieldProcessorPerThread perThread = (DocFieldProcessorPerThread) thread;
      childThreadsAndFields.put(perThread.consumer, perThread.fields());

    consumer.flush(childThreadsAndFields, state);

    // Important to save after asking consumer to flush so
    // consumer can alter the FieldInfo* if necessary.  EG,
    // FreqProxTermsWriter does this with
    // FieldInfo.storePayload.
    final String fileName = IndexFileNames.segmentFileName(state.segmentName, IndexFileNames.FIELD_INFOS_EXTENSION);
    fieldInfos.write(state.directory, fileName);

  public void abort() {
    try {
    } finally {

  public boolean freeRAM() {
    return consumer.freeRAM();

  public DocConsumerPerThread addThread(DocumentsWriterThreadState threadState) throws IOException {
    return new DocFieldProcessorPerThread(threadState, this);

Other Lucene examples (source code examples)

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

my book on functional programming


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