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Apache Lucene Java Core
There is a newer version: 9.10.0
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.util.Objects;

import org.apache.lucene.codecs.DocValuesProducer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.NormsProducer;
import org.apache.lucene.codecs.StoredFieldsReader;
import org.apache.lucene.codecs.TermVectorsReader;
import org.apache.lucene.util.Bits;

/** 
 * A FilterCodecReader contains another CodecReader, which it
 * uses as its basic source of data, possibly transforming the data along the
 * way or providing additional functionality.
 */
public class FilterCodecReader extends CodecReader {
  /** 
   * The underlying CodecReader instance. 
   */
  protected final CodecReader in;
  
  /**
   * Creates a new FilterCodecReader.
   * @param in the underlying CodecReader instance.
   */
  public FilterCodecReader(CodecReader in) {
    this.in = Objects.requireNonNull(in);
  }

  @Override
  public StoredFieldsReader getFieldsReader() {
    return in.getFieldsReader();
  }

  @Override
  public TermVectorsReader getTermVectorsReader() {
    return in.getTermVectorsReader();
  }

  @Override
  public NormsProducer getNormsReader() {
    return in.getNormsReader();
  }

  @Override
  public DocValuesProducer getDocValuesReader() {
    return in.getDocValuesReader();
  }

  @Override
  public FieldsProducer getPostingsReader() {
    return in.getPostingsReader();
  }

  @Override
  public Bits getLiveDocs() {
    return in.getLiveDocs();
  }

  @Override
  public FieldInfos getFieldInfos() {
    return in.getFieldInfos();
  }

  @Override
  public int numDocs() {
    return in.numDocs();
  }

  @Override
  public int maxDoc() {
    return in.maxDoc();
  }

  @Override
  public void addCoreClosedListener(CoreClosedListener listener) {
    in.addCoreClosedListener(listener);
  }

  @Override
  public void removeCoreClosedListener(CoreClosedListener listener) {
    in.removeCoreClosedListener(listener);
  }
}