lucene/core/src/test/org/apache/lucene/search/TestMaxScoreAccumulator.java

/*
 * 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;

import org.apache.lucene.util.LuceneTestCase;

public class TestMaxScoreAccumulator extends LuceneTestCase {
  public void testSimple() {
    MaxScoreAccumulator acc = new MaxScoreAccumulator();
    acc.accumulate(0, 0f);
    acc.accumulate(10, 0f);
    assertEquals(0f, acc.get().score, 0);
    assertEquals(10, acc.get().docID, 0);
    acc.accumulate(100, 1000f);
    assertEquals(1000f, acc.get().score, 0);
    assertEquals(100, acc.get().docID, 0);
    acc.accumulate(1000, 5f);
    assertEquals(1000f, acc.get().score, 0);
    assertEquals(100, acc.get().docID, 0);
    acc.accumulate(99, 1000f);
    assertEquals(1000f, acc.get().score, 0);
    assertEquals(100, acc.get().docID, 0);
    acc.accumulate(0, 1001f);
    assertEquals(1001f, acc.get().score, 0);
    assertEquals(0, acc.get().docID, 0);
  }

  public void testRandom() {
    MaxScoreAccumulator acc = new MaxScoreAccumulator();
    int numDocs = atLeast(100);
    int maxDocs = atLeast(10000);
    MaxScoreAccumulator.DocAndScore max = new MaxScoreAccumulator.DocAndScore(-1, -1);
    for (int i = 0; i < numDocs; i++) {
      MaxScoreAccumulator.DocAndScore res = new MaxScoreAccumulator.DocAndScore(random().nextInt(maxDocs), random().nextFloat());
      acc.accumulate(res.docID, res.score);
      if (res.compareTo(max) > 0) {
        max = res;
      }
    }
    assertEquals(max, acc.get());
  }
}