| /* |
| * 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.flink.table.api; |
| |
| import org.apache.flink.annotation.PublicEvolving; |
| |
| import java.util.Optional; |
| |
| /** The {@link PlannerConfig} holds parameters to configure the behavior of queries. */ |
| @PublicEvolving |
| public interface PlannerConfig { |
| |
| PlannerConfig EMPTY_CONFIG = new PlannerConfig() {}; |
| |
| @SuppressWarnings("unchecked") |
| default <T extends PlannerConfig> Optional<T> unwrap(Class<T> type) { |
| if (type.isInstance(this)) { |
| return Optional.of((T) this); |
| } else { |
| return Optional.empty(); |
| } |
| } |
| } |
