org.apache.lucene.codecs.PointsWriter Maven / Gradle / Ivy

Go to download
/*
 * 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;


import java.io.Closeable;
import java.io.IOException;

import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.MergeState;
import org.apache.lucene.index.PointValues;

/** Abstract API to write points
 *
 * @lucene.experimental
 */

public abstract class PointsWriter implements Closeable {
  /** Sole constructor. (For invocation by subclass 
   *  constructors, typically implicit.) */
  protected PointsWriter() {
  }

  /** Write all values contained in the provided reader */
  public abstract void writeField(FieldInfo fieldInfo, PointsReader values) throws IOException;

  /** Default naive merge implementation for one field: it just re-indexes all the values
   *  from the incoming segment.  The default codec overrides this for 1D fields and uses
   *  a faster but more complex implementation. */
  protected void mergeOneField(MergeState mergeState, FieldInfo fieldInfo) throws IOException {
    long maxPointCount = 0;
    int docCount = 0;
    for (int i=0;i 0) {
          PointValues values = pointsReader.getValues(fieldInfo.name);
          if (values != null) {
            maxPointCount += values.size();
            docCount += values.getDocCount();
          }
        }
      }
    }
    final long finalMaxPointCount = maxPointCount;
    final int finalDocCount = docCount;
    writeField(fieldInfo,
        new PointsReader() {
          
          @Override
          public long ramBytesUsed() {
            return 0;
          }
          
          @Override
          public void close() throws IOException {}
          
          @Override
          public PointValues getValues(String fieldName) {
            if (fieldName.equals(fieldInfo.name) == false) {
              throw new IllegalArgumentException("field name must match the field being merged");
            }

            return new PointValues() {
              
              @Override
              public void intersect(IntersectVisitor mergedVisitor) throws IOException {
                for (int i=0;i