| /* |
| * 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.physical.base; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * Describes an operator that expects more than one children operators as its input. |
| */ |
| public abstract class AbstractMultiple extends AbstractBase{ |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(AbstractMultiple.class); |
| |
| protected final List<PhysicalOperator> children; |
| |
| protected AbstractMultiple(List<PhysicalOperator> children) { |
| this.children = children; |
| } |
| |
| public List<PhysicalOperator> getChildren() { |
| return children; |
| } |
| |
| @Override |
| public Iterator<PhysicalOperator> iterator() { |
| return children.iterator(); |
| } |
| |
| |
| } |