| /* |
| * 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.String; |
| |
| import org.apache.iotdb.tsfile.common.conf.TSFileConfig; |
| 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 returns if input series starts with the specified prefix.*/ |
| public class UDTFStartsWith implements UDTF { |
| private String target; |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws Exception { |
| validator.validateInputSeriesNumber(1).validateInputSeriesDataType(0, Type.TEXT); |
| } |
| |
| @Override |
| public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations) |
| throws Exception { |
| target = parameters.getString("target"); |
| configurations |
| .setAccessStrategy(new MappableRowByRowAccessStrategy()) |
| .setOutputDataType(Type.BOOLEAN); |
| } |
| |
| @Override |
| public void transform(Row row, PointCollector collector) throws Exception { |
| collector.putBoolean(row.getTime(), row.getString(0).startsWith(target)); |
| } |
| |
| @Override |
| public Object transform(Row row) throws IOException { |
| if (row.isNull(0)) { |
| return null; |
| } |
| return row.getString(0).startsWith(target); |
| } |
| |
| @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(); |
| for (int i = 0; i < count; i++) { |
| if (isNulls[i]) { |
| builder.appendNull(); |
| } else { |
| String str = inputs[i].getStringValue(TSFileConfig.STRING_CHARSET); |
| builder.writeBoolean(str.startsWith(target)); |
| } |
| } |
| } |
| } |