| /* |
| * 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.drill.exec.planner.sql.parser; |
| |
| import org.apache.calcite.sql.SqlAggFunction; |
| import org.apache.calcite.sql.SqlFunction; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.drill.exec.planner.sql.DrillCalciteSqlWrapper; |
| |
| /** |
| * |
| * This utility contains the static functions to manipulate {@link DrillCalciteSqlWrapper}, {@link DrillCalciteSqlOperatorWrapper} |
| * {@link DrillCalciteSqlFunctionWrapper} and {@link DrillCalciteSqlAggFunctionWrapper}. |
| */ |
| public class DrillCalciteWrapperUtility { |
| /** |
| * This static method will extract the SqlOperator inside the given SqlOperator if the given SqlOperator is wrapped |
| * in DrillCalciteSqlWrapper and will just return the given SqlOperator if it is not wrapped. |
| */ |
| public static SqlOperator extractSqlOperatorFromWrapper(final SqlOperator sqlOperator) { |
| if(sqlOperator instanceof DrillCalciteSqlWrapper) { |
| return ((DrillCalciteSqlWrapper) sqlOperator).getOperator(); |
| } else { |
| return sqlOperator; |
| } |
| } |
| |
| /** |
| * This static method will extract the SqlFunction inside the given SqlFunction if the given SqlFunction is wrapped |
| * in DrillCalciteSqlFunctionWrapper and will just return the given SqlFunction if it is not wrapped. |
| */ |
| public static SqlFunction extractSqlOperatorFromWrapper(final SqlFunction sqlFunction) { |
| if(sqlFunction instanceof DrillCalciteSqlWrapper) { |
| return (SqlFunction) ((DrillCalciteSqlWrapper) sqlFunction).getOperator(); |
| } else { |
| return sqlFunction; |
| } |
| } |
| |
| /** |
| * This static method will extract the SqlAggFunction inside the given SqlAggFunction if the given SqlFunction is wrapped |
| * in DrillCalciteSqlAggFunctionWrapper and will just return the given SqlAggFunction if it is not wrapped. |
| */ |
| public static SqlAggFunction extractSqlOperatorFromWrapper(final SqlAggFunction sqlAggFunction) { |
| if(sqlAggFunction instanceof DrillCalciteSqlWrapper) { |
| return (SqlAggFunction) ((DrillCalciteSqlWrapper) sqlAggFunction).getOperator(); |
| } else { |
| return sqlAggFunction; |
| } |
| } |
| |
| /** |
| * This class is not intended to be instantiated |
| */ |
| private DrillCalciteWrapperUtility() { |
| } |
| } |