| /* |
| * 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.queryengine.plan.expression.multi.builtin.helper; |
| |
| import org.apache.iotdb.db.exception.sql.SemanticException; |
| import org.apache.iotdb.db.queryengine.plan.expression.multi.FunctionExpression; |
| import org.apache.iotdb.db.queryengine.plan.expression.multi.builtin.BuiltInScalarFunctionHelper; |
| import org.apache.iotdb.db.queryengine.transformation.api.LayerPointReader; |
| import org.apache.iotdb.db.queryengine.transformation.dag.column.ColumnTransformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.column.unary.scalar.ReplaceFunctionColumnTransformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.transformer.Transformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.transformer.unary.scalar.ReplaceFunctionTransformer; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.type.TypeFactory; |
| |
| import java.util.Map; |
| |
| import static org.apache.iotdb.db.utils.constant.SqlConstant.REPLACE_FROM; |
| import static org.apache.iotdb.db.utils.constant.SqlConstant.REPLACE_TO; |
| |
| public class ReplaceFunctionHelper implements BuiltInScalarFunctionHelper { |
| @Override |
| public void checkBuiltInScalarFunctionInputDataType(TSDataType tsDataType) |
| throws SemanticException { |
| if (tsDataType.equals(TSDataType.TEXT)) { |
| return; |
| } |
| throw new SemanticException( |
| "Input series of Scalar function [REPLACE] only support text data type."); |
| } |
| |
| @Override |
| public TSDataType getBuiltInScalarFunctionReturnType(FunctionExpression functionExpression) { |
| return TSDataType.TEXT; |
| } |
| |
| @Override |
| public ColumnTransformer getBuiltInScalarFunctionColumnTransformer( |
| FunctionExpression expression, ColumnTransformer columnTransformer) { |
| checkFromAndToAttributes(expression); |
| return new ReplaceFunctionColumnTransformer( |
| TypeFactory.getType(TSDataType.TEXT), |
| columnTransformer, |
| expression.getFunctionAttributes().get(REPLACE_FROM), |
| expression.getFunctionAttributes().get(REPLACE_TO)); |
| } |
| |
| @Override |
| public Transformer getBuiltInScalarFunctionTransformer( |
| FunctionExpression expression, LayerPointReader layerPointReader) { |
| checkFromAndToAttributes(expression); |
| return new ReplaceFunctionTransformer( |
| layerPointReader, |
| expression.getFunctionAttributes().get(REPLACE_FROM), |
| expression.getFunctionAttributes().get(REPLACE_TO)); |
| } |
| |
| @Override |
| public void appendFunctionAttributes( |
| boolean hasExpression, StringBuilder builder, Map<String, String> functionAttributes) { |
| builder.append(", '"); |
| builder.append(functionAttributes.get(REPLACE_FROM)); |
| builder.append("', '"); |
| builder.append(functionAttributes.get(REPLACE_TO)); |
| builder.append("'"); |
| } |
| |
| private void checkFromAndToAttributes(FunctionExpression expression) { |
| if (!expression.getFunctionAttributes().containsKey(REPLACE_FROM) |
| || !expression.getFunctionAttributes().containsKey(REPLACE_TO)) { |
| throw new SemanticException("Function REPLACE must specify from and to component."); |
| } |
| } |
| } |