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Lucene example source code file (FormatPostingsFieldsWriter.java)

This example Lucene source code file (FormatPostingsFieldsWriter.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

defaultskiplistwriter, fieldinfos, fieldinfos, formatpostingsfieldsconsumer, formatpostingsfieldswriter, formatpostingsfieldswriter, formatpostingstermsconsumer, formatpostingstermswriter, io, ioexception, ioexception, override, string, terminfoswriter, terminfoswriter

The Lucene FormatPostingsFieldsWriter.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.store.Directory;
import org.apache.lucene.util.IOUtils;

final class FormatPostingsFieldsWriter extends FormatPostingsFieldsConsumer {

  final Directory dir;
  final String segment;
  TermInfosWriter termsOut;
  final FieldInfos fieldInfos;
  FormatPostingsTermsWriter termsWriter;
  final DefaultSkipListWriter skipListWriter;
  final int totalNumDocs;

  public FormatPostingsFieldsWriter(SegmentWriteState state, FieldInfos fieldInfos) throws IOException {
    dir = state.directory;
    segment = state.segmentName;
    totalNumDocs = state.numDocs;
    this.fieldInfos = fieldInfos;
    boolean success = false;
    try {
      termsOut = new TermInfosWriter(dir, segment, fieldInfos, state.termIndexInterval);
      
      // TODO: this is a nasty abstraction violation (that we
      // peek down to find freqOut/proxOut) -- we need a
      // better abstraction here whereby these child consumers
      // can provide skip data or not
      skipListWriter = new DefaultSkipListWriter(termsOut.skipInterval,
          termsOut.maxSkipLevels, totalNumDocs, null, null);
      
      termsWriter = new FormatPostingsTermsWriter(state, this);
      success = true;
    } finally {
      if (!success) {
        IOUtils.closeSafely(true, termsOut, termsWriter);
      }
    }
  }

  /** Add a new field */
  @Override
  FormatPostingsTermsConsumer addField(FieldInfo field) {
    termsWriter.setField(field);
    return termsWriter;
  }

  /** Called when we are done adding everything. */
  @Override
  void finish() throws IOException {
    IOUtils.closeSafely(false, termsOut, termsWriter);
  }
}

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