| /* |
| * 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.exception.MetadataException; |
| 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.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.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 org.apache.tsfile.utils.Pair; |
| |
| import java.io.IOException; |
| import java.util.Comparator; |
| import java.util.PriorityQueue; |
| import java.util.stream.Collectors; |
| |
| public abstract class UDTFSelectK implements UDTF { |
| |
| protected int k; |
| protected TSDataType dataType; |
| protected PriorityQueue<Pair<Long, Integer>> intPQ; |
| protected PriorityQueue<Pair<Long, Long>> longPQ; |
| protected PriorityQueue<Pair<Long, Float>> floatPQ; |
| protected PriorityQueue<Pair<Long, Double>> doublePQ; |
| protected PriorityQueue<Pair<Long, String>> stringPQ; |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws UDFException { |
| validator |
| .validateInputSeriesNumber(1) |
| .validateInputSeriesDataType(0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE, Type.TEXT) |
| .validateRequiredAttribute("k") |
| .validate( |
| k -> 0 < (int) k && (int) k <= 1000, |
| "k has to be greater than 0 and less than or equal to 1000.", |
| validator.getParameters().getInt("k")); |
| } |
| |
| @Override |
| public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations) |
| throws MetadataException, UDFInputSeriesDataTypeNotValidException { |
| k = parameters.getInt("k"); |
| dataType = UDFDataTypeTransformer.transformToTsDataType(parameters.getDataType(0)); |
| constructPQ(); |
| configurations |
| .setAccessStrategy(new RowByRowAccessStrategy()) |
| .setOutputDataType(UDFDataTypeTransformer.transformToUDFDataType(dataType)); |
| } |
| |
| protected abstract void constructPQ() throws UDFInputSeriesDataTypeNotValidException; |
| |
| @Override |
| public void transform(Row row, PointCollector collector) |
| throws UDFInputSeriesDataTypeNotValidException, IOException { |
| switch (dataType) { |
| case INT32: |
| transformInt(row.getTime(), row.getInt(0)); |
| break; |
| case INT64: |
| transformLong(row.getTime(), row.getLong(0)); |
| break; |
| case FLOAT: |
| transformFloat(row.getTime(), row.getFloat(0)); |
| break; |
| case DOUBLE: |
| transformDouble(row.getTime(), row.getDouble(0)); |
| break; |
| case TEXT: |
| transformString(row.getTime(), row.getString(0)); |
| break; |
| default: |
| // This will not happen. |
| throw new UDFInputSeriesDataTypeNotValidException( |
| 0, |
| UDFDataTypeTransformer.transformToUDFDataType(dataType), |
| Type.INT32, |
| Type.INT64, |
| Type.FLOAT, |
| Type.DOUBLE, |
| Type.TEXT); |
| } |
| } |
| |
| protected abstract void transformInt(long time, int value); |
| |
| protected abstract void transformLong(long time, long value); |
| |
| protected abstract void transformFloat(long time, float value); |
| |
| protected abstract void transformDouble(long time, double value); |
| |
| protected abstract void transformString(long time, String value); |
| |
| @Override |
| public void terminate(PointCollector collector) |
| throws UDFInputSeriesDataTypeNotValidException, IOException { |
| switch (dataType) { |
| case INT32: |
| for (Pair<Long, Integer> pair : |
| intPQ.stream().sorted(Comparator.comparing(p -> p.left)).collect(Collectors.toList())) { |
| collector.putInt(pair.left, pair.right); |
| } |
| break; |
| case INT64: |
| for (Pair<Long, Long> pair : |
| longPQ.stream() |
| .sorted(Comparator.comparing(p -> p.left)) |
| .collect(Collectors.toList())) { |
| collector.putLong(pair.left, pair.right); |
| } |
| break; |
| case FLOAT: |
| for (Pair<Long, Float> pair : |
| floatPQ.stream() |
| .sorted(Comparator.comparing(p -> p.left)) |
| .collect(Collectors.toList())) { |
| collector.putFloat(pair.left, pair.right); |
| } |
| break; |
| case DOUBLE: |
| for (Pair<Long, Double> pair : |
| doublePQ.stream() |
| .sorted(Comparator.comparing(p -> p.left)) |
| .collect(Collectors.toList())) { |
| collector.putDouble(pair.left, pair.right); |
| } |
| break; |
| case TEXT: |
| for (Pair<Long, String> pair : |
| stringPQ.stream() |
| .sorted(Comparator.comparing(p -> p.left)) |
| .collect(Collectors.toList())) { |
| collector.putString(pair.left, pair.right); |
| } |
| break; |
| default: |
| // This will not happen. |
| throw new UDFInputSeriesDataTypeNotValidException( |
| 0, |
| UDFDataTypeTransformer.transformToUDFDataType(dataType), |
| Type.INT32, |
| Type.INT64, |
| Type.FLOAT, |
| Type.DOUBLE, |
| Type.TEXT); |
| } |
| } |
| } |