| /** |
| * 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.pig.newplan.logical.rules; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.optimizer.Rule; |
| |
| /** |
| * Super class for all rules that operates on the whole plan. It doesn't look for |
| * a specific pattern. An example of such kind rule is ColumnPrune. |
| * |
| */ |
| public abstract class WholePlanRule extends Rule { |
| |
| public WholePlanRule(String n, boolean mandatory) { |
| super(n, mandatory); |
| } |
| |
| public List<OperatorPlan> match(OperatorPlan plan) { |
| currentPlan = plan; |
| List<OperatorPlan> ll = new ArrayList<OperatorPlan>(); |
| ll.add(plan); |
| return ll; |
| } |
| |
| @Override |
| protected OperatorPlan buildPattern() { |
| return null; |
| } |
| } |