| /* |
| * 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.UDTF; |
| import org.apache.iotdb.udf.api.access.Row; |
| import org.apache.iotdb.udf.api.collector.PointCollector; |
| import org.apache.iotdb.udf.api.customizer.config.UDTFConfigurations; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameterValidator; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameters; |
| import org.apache.iotdb.udf.api.customizer.strategy.RowByRowAccessStrategy; |
| import org.apache.iotdb.udf.api.type.Type; |
| |
| import org.apache.tsfile.write.UnSupportedDataTypeException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| |
| public class Adder implements UDTF { |
| |
| private static final Logger logger = LoggerFactory.getLogger(Adder.class); |
| |
| private double addend; |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws Exception { |
| validator |
| .validateInputSeriesNumber(2) |
| .validateInputSeriesDataType(0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE) |
| .validateInputSeriesDataType(1, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE); |
| } |
| |
| @Override |
| public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations) { |
| logger.debug("Adder#beforeStart"); |
| addend = parameters.getFloatOrDefault("addend", 0); |
| configurations.setOutputDataType(Type.INT64).setAccessStrategy(new RowByRowAccessStrategy()); |
| } |
| |
| @Override |
| public void transform(Row row, PointCollector collector) throws Exception { |
| if (row.isNull(0) || row.isNull(1)) { |
| return; |
| } |
| collector.putLong( |
| row.getTime(), (long) (extractDoubleValue(row, 0) + extractDoubleValue(row, 1) + addend)); |
| } |
| |
| private double extractDoubleValue(Row row, int index) throws IOException { |
| double value; |
| switch (row.getDataType(index)) { |
| case INT32: |
| value = row.getInt(index); |
| break; |
| case INT64: |
| value = (double) row.getLong(index); |
| break; |
| case FLOAT: |
| value = row.getFloat(index); |
| break; |
| case DOUBLE: |
| value = row.getDouble(index); |
| break; |
| default: |
| throw new UnSupportedDataTypeException(row.getDataType(index).toString()); |
| } |
| return value; |
| } |
| |
| @Override |
| public void beforeDestroy() { |
| logger.debug("Adder#beforeDestroy"); |
| } |
| } |