| /* |
| * 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.common.logical.data.visitors; |
| |
| |
| import org.apache.drill.common.logical.data.Except; |
| import org.apache.drill.common.logical.data.Intersect; |
| import org.apache.drill.common.logical.data.LateralJoin; |
| import org.apache.drill.common.logical.data.Unnest; |
| import org.apache.drill.common.logical.data.Analyze; |
| import org.apache.drill.common.logical.data.Values; |
| import org.apache.drill.common.logical.data.Filter; |
| import org.apache.drill.common.logical.data.Flatten; |
| import org.apache.drill.common.logical.data.GroupingAggregate; |
| import org.apache.drill.common.logical.data.Join; |
| import org.apache.drill.common.logical.data.Limit; |
| import org.apache.drill.common.logical.data.Order; |
| import org.apache.drill.common.logical.data.Project; |
| import org.apache.drill.common.logical.data.RunningAggregate; |
| import org.apache.drill.common.logical.data.Scan; |
| import org.apache.drill.common.logical.data.Store; |
| import org.apache.drill.common.logical.data.Transform; |
| import org.apache.drill.common.logical.data.Union; |
| import org.apache.drill.common.logical.data.Window; |
| import org.apache.drill.common.logical.data.Writer; |
| |
| /** |
| * Visitor class designed to traversal of a operator tree. Basis for a number of operator manipulations including fragmentation and materialization. |
| * @param <RETURN> The class associated with the return of each visit method. |
| * @param <EXTRA> The class object associated with additional data required for a particular operator modification. |
| * @param <EXCEP> An optional exception class that can be thrown when a portion of a modification or traversal fails. Must extend Throwable. In the case where the visitor does not throw any caught exception, this can be set as RuntimeException. |
| */ |
| public interface LogicalVisitor<RETURN, EXTRA, EXCEP extends Throwable> { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(LogicalVisitor.class); |
| |
| |
| public RETURN visitScan(Scan scan, EXTRA value) throws EXCEP; |
| public RETURN visitStore(Store store, EXTRA value) throws EXCEP; |
| public RETURN visitGroupingAggregate(GroupingAggregate groupBy, EXTRA value) throws EXCEP; |
| public RETURN visitFilter(Filter filter, EXTRA value) throws EXCEP; |
| public RETURN visitFlatten(Flatten flatten, EXTRA value) throws EXCEP; |
| public RETURN visitAnalyze(Analyze analyze, EXTRA value) throws EXCEP; |
| |
| public RETURN visitProject(Project project, EXTRA value) throws EXCEP; |
| public RETURN visitValues(Values constant, EXTRA value) throws EXCEP; |
| public RETURN visitOrder(Order order, EXTRA value) throws EXCEP; |
| public RETURN visitJoin(Join join, EXTRA value) throws EXCEP; |
| public RETURN visitLimit(Limit limit, EXTRA value) throws EXCEP; |
| public RETURN visitRunningAggregate(RunningAggregate runningAggregate, EXTRA value) throws EXCEP; |
| public RETURN visitTransform(Transform transform, EXTRA value) throws EXCEP; |
| public RETURN visitUnion(Union union, EXTRA value) throws EXCEP; |
| public RETURN visitExcept(Except except, EXTRA value) throws EXCEP; |
| public RETURN visitIntersect(Intersect intersect, EXTRA value) throws EXCEP; |
| public RETURN visitWindow(Window window, EXTRA value) throws EXCEP; |
| public RETURN visitWriter(Writer writer, EXTRA value) throws EXCEP; |
| |
| public RETURN visitUnnest(Unnest unnest, EXTRA value) throws EXCEP; |
| public RETURN visitLateralJoin(LateralJoin lateralJoin, EXTRA value) throws EXCEP; |
| } |