| /* |
| * 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.wayang.core.plan.wayangplan; |
| |
| import java.util.Collection; |
| |
| /** |
| * A composite operator can be decomposed into smaller operators. |
| */ |
| public interface CompositeOperator extends Operator { |
| |
| @Override |
| default boolean isElementary() { |
| return false; |
| } |
| |
| /** |
| * Acknowledge that the given old operator has been replaced with a new one. |
| * |
| * @param oldOperator the operator that has been replaced |
| * @param newOperator the new operator |
| */ |
| void noteReplaced(Operator oldOperator, Operator newOperator); |
| |
| /** |
| * Get the {@link OperatorContainer}s of this instance. |
| * |
| * @return the {@link OperatorContainer}s |
| */ |
| Collection<OperatorContainer> getContainers(); |
| |
| } |