org.apache.lucene.codecs.lucene60.Lucene60PointsReader Maven / Gradle / Ivy

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/*
 * 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.
 */
package org.apache.lucene.codecs.lucene60;


import java.io.Closeable;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.codecs.PointsReader;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.PointValues;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.store.ChecksumIndexInput;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.bkd.BKDReader;

/** Reads point values previously written with Lucene60PointsWriter */
public class Lucene60PointsReader extends PointsReader implements Closeable {
  final IndexInput dataIn;
  final SegmentReadState readState;
  final Map readers = new HashMap<>();

  /** Sole constructor */
  public Lucene60PointsReader(SegmentReadState readState) throws IOException {
    this.readState = readState;


    String indexFileName = IndexFileNames.segmentFileName(readState.segmentInfo.name,
                                                          readState.segmentSuffix,
                                                          Lucene60PointsFormat.INDEX_EXTENSION);

    Map fieldToFileOffset = new HashMap<>();

    // Read index file
    try (ChecksumIndexInput indexIn = readState.directory.openChecksumInput(indexFileName, readState.context)) {
      Throwable priorE = null;
      try {
        CodecUtil.checkIndexHeader(indexIn,
                                   Lucene60PointsFormat.META_CODEC_NAME,
                                   Lucene60PointsFormat.INDEX_VERSION_START,
                                   Lucene60PointsFormat.INDEX_VERSION_CURRENT,
                                   readState.segmentInfo.getId(),
                                   readState.segmentSuffix);
        int count = indexIn.readVInt();
        for(int i=0;i ent : fieldToFileOffset.entrySet()) {
        int fieldNumber = ent.getKey();
        long fp = ent.getValue();
        dataIn.seek(fp);
        BKDReader reader = new BKDReader(dataIn, dataIn, dataIn);
        readers.put(fieldNumber, reader);
      }

      success = true;
    } finally {
      if (success == false) {
        IOUtils.closeWhileHandlingException(this);
      }
    }
  }

  /** Returns the underlying {@link BKDReader}.
   *
   * @lucene.internal */
  @Override
  public PointValues getValues(String fieldName) {
    FieldInfo fieldInfo = readState.fieldInfos.fieldInfo(fieldName);
    if (fieldInfo == null) {
      throw new IllegalArgumentException("field=\"" + fieldName + "\" is unrecognized");
    }
    if (fieldInfo.getPointDimensionCount() == 0) {
      throw new IllegalArgumentException("field=\"" + fieldName + "\" did not index point values");
    }

    return readers.get(fieldInfo.number);
  }

  @Override
  public long ramBytesUsed() {
    return 0L;
  }

  @Override
  public void checkIntegrity() throws IOException {
    CodecUtil.checksumEntireFile(dataIn);
  }

  @Override
  public void close() throws IOException {
    dataIn.close();
    // Free up heap:
    readers.clear();
  }

}