/* * Copyright © 2015 Cask Data, Inc. * * Licensed 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 co.cask.cdap.dq.functions; import co.cask.cdap.dq.DataQualityWritable; /** * Basic Aggregation Function Interface: All aggregation function classes -- combinable or non-combinable * -- should implement these methods * @param <T> Type of the aggregation */ public interface BasicAggregationFunction<T> { /** * Incrementally add values to the aggregation */ void add(DataQualityWritable value); /** * Return the aggregation accumulated using add() in the form of a byte[] */ byte[] aggregate(); /** * Deserialize a given value appropriately */ T deserialize(byte[] value); }