| /* |
| * 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 java.util.Objects; |
| |
| /** |
| * Description of the total number of hits of a query. The total hit count |
| * can't generally be computed accurately without visiting all matches, which |
| * is costly for queries that match lots of documents. Given that it is often |
| * enough to have a lower bounds of the number of hits, such as |
| * "there are more than 1000 hits", Lucene has options to stop counting as soon |
| * as a threshold has been reached in order to improve query times. |
| */ |
| public final class TotalHits { |
| |
| /** How the {@link TotalHits#value} should be interpreted. */ |
| public enum Relation { |
| /** |
| * The total hit count is equal to {@link TotalHits#value}. |
| */ |
| EQUAL_TO, |
| /** |
| * The total hit count is greater than or equal to {@link TotalHits#value}. |
| */ |
| GREATER_THAN_OR_EQUAL_TO |
| } |
| |
| /** |
| * The value of the total hit count. Must be interpreted in the context of |
| * {@link #relation}. |
| */ |
| public final long value; |
| |
| /** |
| * Whether {@link #value} is the exact hit count, in which case |
| * {@link #relation} is equal to {@link Relation#EQUAL_TO}, or a lower bound |
| * of the total hit count, in which case {@link #relation} is equal to |
| * {@link Relation#GREATER_THAN_OR_EQUAL_TO}. |
| */ |
| public final Relation relation; |
| |
| /** Sole constructor. */ |
| public TotalHits(long value, Relation relation) { |
| if (value < 0) { |
| throw new IllegalArgumentException("value must be >= 0, got " + value); |
| } |
| this.value = value; |
| this.relation = Objects.requireNonNull(relation); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| TotalHits totalHits = (TotalHits) o; |
| return value == totalHits.value && relation == totalHits.relation; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(value, relation); |
| } |
| |
| @Override |
| public String toString() { |
| return value + (relation == Relation.EQUAL_TO ? "" : "+") + " hits"; |
| } |
| |
| } |