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High-performance single-document index to compare against Query

There is a newer version: 10.1.0

/*
 * 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.monitor;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.lucene.search.Query;

class QueryCacheEntry {

  /** The (possibly partial due to decomposition) query */
  final Query matchQuery;

  /** The id of this query */
  final String cacheId;

  /**
   * The id of the MonitorQuery that produced this entry
   *
   * Note that this may be different to {@link #cacheId} due to decomposition
   */
  final String queryId;

  /** The metadata from the entry's parent {@link MonitorQuery} */
  final Map metadata;

  private QueryCacheEntry(
      String cacheId, String queryId, Query matchQuery, Map metadata) {
    this.cacheId = cacheId;
    this.queryId = queryId;
    this.matchQuery = matchQuery;
    this.metadata = metadata;
  }

  static List decompose(MonitorQuery mq, QueryDecomposer decomposer) {
    int upto = 0;
    List cacheEntries = new ArrayList<>();
    for (Query subquery : decomposer.decompose(mq.getQuery())) {
      cacheEntries.add(
          new QueryCacheEntry(mq.getId() + "_" + upto, mq.getId(), subquery, mq.getMetadata()));
      upto++;
    }
    return cacheEntries;
  }

  @Override
  public String toString() {
    return queryId + "/" + cacheId + "/" + matchQuery;
  }
}