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This is the highlighter for apache lucene java
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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.search.vectorhighlight;

import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.highlight.Encoder;

/**
 * {@link org.apache.lucene.search.vectorhighlight.FragmentsBuilder} is an interface for fragments
 * (snippets) builder classes. A {@link org.apache.lucene.search.vectorhighlight.FragmentsBuilder}
 * class can be plugged in to {@link
 * org.apache.lucene.search.vectorhighlight.FastVectorHighlighter}.
 */
public interface FragmentsBuilder {

  /**
   * create a fragment.
   *
   * @param reader IndexReader of the index
   * @param docId document id to be highlighted
   * @param fieldName field of the document to be highlighted
   * @param fieldFragList FieldFragList object
   * @return a created fragment or null when no fragment created
   * @throws IOException If there is a low-level I/O error
   */
  public String createFragment(
      IndexReader reader, int docId, String fieldName, FieldFragList fieldFragList)
      throws IOException;

  /**
   * create multiple fragments.
   *
   * @param reader IndexReader of the index
   * @param docId document id to be highlighter
   * @param fieldName field of the document to be highlighted
   * @param fieldFragList FieldFragList object
   * @param maxNumFragments maximum number of fragments
   * @return created fragments or null when no fragments created. size of the array can be less than
   *     maxNumFragments
   * @throws IOException If there is a low-level I/O error
   */
  public String[] createFragments(
      IndexReader reader,
      int docId,
      String fieldName,
      FieldFragList fieldFragList,
      int maxNumFragments)
      throws IOException;

  /**
   * create a fragment.
   *
   * @param reader IndexReader of the index
   * @param docId document id to be highlighted
   * @param fieldName field of the document to be highlighted
   * @param fieldFragList FieldFragList object
   * @param preTags pre-tags to be used to highlight terms
   * @param postTags post-tags to be used to highlight terms
   * @param encoder an encoder that generates encoded text
   * @return a created fragment or null when no fragment created
   * @throws IOException If there is a low-level I/O error
   */
  public String createFragment(
      IndexReader reader,
      int docId,
      String fieldName,
      FieldFragList fieldFragList,
      String[] preTags,
      String[] postTags,
      Encoder encoder)
      throws IOException;

  /**
   * create multiple fragments.
   *
   * @param reader IndexReader of the index
   * @param docId document id to be highlighter
   * @param fieldName field of the document to be highlighted
   * @param fieldFragList FieldFragList object
   * @param maxNumFragments maximum number of fragments
   * @param preTags pre-tags to be used to highlight terms
   * @param postTags post-tags to be used to highlight terms
   * @param encoder an encoder that generates encoded text
   * @return created fragments or null when no fragments created. size of the array can be less than
   *     maxNumFragments
   * @throws IOException If there is a low-level I/O error
   */
  public String[] createFragments(
      IndexReader reader,
      int docId,
      String fieldName,
      FieldFragList fieldFragList,
      int maxNumFragments,
      String[] preTags,
      String[] postTags,
      Encoder encoder)
      throws IOException;
}