1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.shardingsphere.sharding.merge.dql.groupby.aggregation; 19 20 import java.util.List; 21 22 /** 23 * Aggregation unit interface. 24 */ 25 public interface AggregationUnit { 26 27 /** 28 * Merge aggregation values. 29 * 30 * @param values aggregation values 31 */ 32 void merge(List<Comparable<?>> values); 33 34 /** 35 * Get aggregation result. 36 * 37 * @return aggregation result 38 */ 39 Comparable<?> getResult(); 40 }