| /* |
| * 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.commons.udf.builtin; |
| |
| import org.apache.iotdb.commons.udf.utils.UDFDataTypeTransformer; |
| 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.parameter.UDFParameterValidator; |
| import org.apache.iotdb.udf.api.exception.UDFException; |
| import org.apache.iotdb.udf.api.exception.UDFInputSeriesDataTypeNotValidException; |
| import org.apache.iotdb.udf.api.type.Type; |
| |
| import org.apache.tsfile.enums.TSDataType; |
| |
| import java.io.IOException; |
| |
| public abstract class UDTFValueTrend implements UDTF { |
| |
| protected boolean hasPrevious = false; |
| |
| protected int previousInt = 0; |
| protected long previousLong = 0; |
| protected float previousFloat = 0; |
| protected double previousDouble = 0; |
| |
| protected TSDataType dataType; |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws UDFException { |
| validator |
| .validateInputSeriesNumber(1) |
| .validateInputSeriesDataType(0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE); |
| } |
| |
| protected void updatePreviousValue(Row row) |
| throws UDFInputSeriesDataTypeNotValidException, IOException { |
| switch (dataType) { |
| case INT32: |
| previousInt = row.getInt(0); |
| break; |
| case INT64: |
| previousLong = row.getLong(0); |
| break; |
| case FLOAT: |
| previousFloat = row.getFloat(0); |
| break; |
| case DOUBLE: |
| previousDouble = row.getDouble(0); |
| break; |
| default: |
| // This will not happen. |
| throw new UDFInputSeriesDataTypeNotValidException( |
| 0, |
| UDFDataTypeTransformer.transformToUDFDataType(dataType), |
| Type.INT32, |
| Type.INT64, |
| Type.FLOAT, |
| Type.DOUBLE); |
| } |
| } |
| |
| protected abstract void doTransform(Row row, PointCollector collector) |
| throws UDFInputSeriesDataTypeNotValidException, IOException; |
| } |