| /* |
| * 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.library.string; |
| |
| import org.apache.iotdb.tsfile.read.common.block.column.Column; |
| import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder; |
| import org.apache.iotdb.tsfile.utils.Binary; |
| 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.MappableRowByRowAccessStrategy; |
| import org.apache.iotdb.udf.api.type.Type; |
| |
| import java.io.IOException; |
| |
| /** This function splits string from an input series according to given regex. */ |
| public class UDTFRegexSplit implements UDTF { |
| |
| private String regex; |
| private int index; |
| |
| @Override |
| public void beforeStart(UDFParameters udfParameters, UDTFConfigurations udtfConfigurations) |
| throws Exception { |
| regex = udfParameters.getString("regex"); |
| index = udfParameters.getIntOrDefault("index", -1); |
| udtfConfigurations.setAccessStrategy(new MappableRowByRowAccessStrategy()); |
| if (index == -1) { |
| udtfConfigurations.setOutputDataType(Type.INT32); |
| } else { |
| udtfConfigurations.setOutputDataType(Type.TEXT); |
| } |
| } |
| |
| @Override |
| public void transform(Row row, PointCollector collector) throws Exception { |
| String[] splitResult = row.getString(0).split(regex); |
| if (index == -1) { |
| collector.putInt(row.getTime(), splitResult.length); |
| } else { |
| if (index < splitResult.length) { |
| collector.putString(row.getTime(), splitResult[index]); |
| } |
| } |
| } |
| |
| @Override |
| public Object transform(Row row) throws IOException { |
| if (row.isNull(0)) { |
| return null; |
| } |
| String str = row.getString(0); |
| String[] splitResult = str.split(regex); |
| |
| if (index == -1) { |
| return splitResult.length; |
| } else { |
| if (index < splitResult.length) { |
| return splitResult[index]; |
| } |
| |
| return null; |
| } |
| } |
| |
| @Override |
| public void transform(Column[] columns, ColumnBuilder builder) throws Exception { |
| Binary[] inputs = columns[0].getBinaries(); |
| boolean[] isNulls = columns[0].isNull(); |
| |
| int count = columns[0].getPositionCount(); |
| |
| if (index == -1) { |
| for (int i = 0; i < count; i++) { |
| if (isNulls[i]) { |
| builder.appendNull(); |
| } else { |
| String str = inputs[i].toString(); |
| |
| String[] splitResult = str.split(regex); |
| builder.writeInt(splitResult.length); |
| } |
| } |
| } else { |
| for (int i = 0; i < count; i++) { |
| if (isNulls[i]) { |
| builder.appendNull(); |
| } else { |
| String str = inputs[i].toString(); |
| |
| String[] splitResult = str.split(regex); |
| if (index < splitResult.length) { |
| builder.writeBinary(new Binary(splitResult[index].getBytes())); |
| } else { |
| builder.appendNull(); |
| } |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws Exception { |
| validator |
| .validateInputSeriesNumber(1) |
| .validateInputSeriesDataType(0, Type.TEXT) |
| .validate( |
| regex -> ((String) regex).length() > 0, |
| "regexp has to be a valid regular expression.", |
| validator.getParameters().getStringOrDefault("regex", "")) |
| .validate( |
| index -> (int) index >= -1, |
| "index must a non-negative integer to fetch split results or -1 to get length.", |
| validator.getParameters().getIntOrDefault("index", -1)); |
| } |
| } |