| /* |
| * 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.iotdb.db.query.udf.example; |
| |
| import org.apache.iotdb.udf.api.State; |
| import org.apache.iotdb.udf.api.UDAF; |
| import org.apache.iotdb.udf.api.customizer.config.UDAFConfigurations; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameterValidator; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameters; |
| import org.apache.iotdb.udf.api.type.Type; |
| import org.apache.iotdb.udf.api.utils.ResultValue; |
| |
| import org.apache.tsfile.block.column.Column; |
| import org.apache.tsfile.utils.BitMap; |
| |
| import java.nio.ByteBuffer; |
| |
| public class UDAFCount implements UDAF { |
| static class CountState implements State { |
| long count; |
| |
| @Override |
| public void reset() { |
| count = 0; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES); |
| buffer.putLong(count); |
| |
| return buffer.array(); |
| } |
| |
| @Override |
| public void deserialize(byte[] bytes) { |
| ByteBuffer buffer = ByteBuffer.wrap(bytes); |
| count = buffer.getLong(); |
| } |
| } |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws Exception { |
| validator |
| .validateInputSeriesNumber(1) |
| .validateInputSeriesDataType( |
| 0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE, Type.BOOLEAN, Type.TEXT); |
| } |
| |
| @Override |
| public void beforeStart(UDFParameters parameters, UDAFConfigurations configurations) { |
| configurations.setOutputDataType(Type.INT64); |
| } |
| |
| @Override |
| public State createState() { |
| return new CountState(); |
| } |
| |
| @Override |
| public void addInput(State state, Column[] column, BitMap bitMap) { |
| CountState countState = (CountState) state; |
| |
| int count = column[0].getPositionCount(); |
| for (int i = 0; i < count; i++) { |
| if (bitMap != null && !bitMap.isMarked(i)) { |
| continue; |
| } |
| if (!column[0].isNull(i)) { |
| countState.count++; |
| } |
| } |
| } |
| |
| @Override |
| public void combineState(State state, State rhs) { |
| CountState countState = (CountState) state; |
| CountState countRhs = (CountState) rhs; |
| |
| countState.count += countRhs.count; |
| } |
| |
| @Override |
| public void outputFinal(State state, ResultValue resultValue) { |
| CountState countState = (CountState) state; |
| resultValue.setLong(countState.count); |
| } |
| |
| @Override |
| public void removeState(State state, State removed) { |
| CountState countState = (CountState) state; |
| CountState countRhs = (CountState) removed; |
| |
| countState.count -= countRhs.count; |
| } |
| } |