| /* |
| * 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.visitor; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.DependencyOrderWalker; |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.PlanWalker; |
| import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan; |
| import org.apache.pig.newplan.logical.expression.LogicalExpressionVisitor; |
| import org.apache.pig.newplan.logical.expression.UserFuncExpression; |
| import org.apache.pig.newplan.logical.relational.LOForEach; |
| import org.apache.pig.newplan.logical.relational.LOGenerate; |
| import org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor; |
| |
| public class UDFFinder extends LogicalRelationalNodesVisitor { |
| |
| private List<UserFuncExpression> mUDFList = new ArrayList<UserFuncExpression>(); |
| |
| public UDFFinder(OperatorPlan plan) |
| throws FrontendException { |
| super(plan, new DependencyOrderWalker(plan)); |
| } |
| |
| @Override |
| public void visit(LOForEach foreach) throws FrontendException { |
| OperatorPlan innerPlan = foreach.getInnerPlan(); |
| PlanWalker newWalker = currentWalker.spawnChildWalker(innerPlan); |
| pushWalker(newWalker); |
| currentWalker.walk(this); |
| popWalker(); |
| } |
| |
| @Override |
| public void visit(LOGenerate generate) throws FrontendException { |
| for (LogicalExpressionPlan plan : generate.getOutputPlans()) { |
| UDFExpFinder udfExpFinder = new UDFExpFinder(plan); |
| udfExpFinder.visit(); |
| mUDFList.addAll(udfExpFinder.getUDFList()); |
| } |
| } |
| |
| /** |
| * |
| * @return true if the plan had any UDFs; false otherwise |
| */ |
| public List<UserFuncExpression> getUDFList() { |
| return mUDFList; |
| } |
| } |
| |
| class UDFExpFinder extends LogicalExpressionVisitor { |
| |
| List<UserFuncExpression> mUDFList = new ArrayList<UserFuncExpression>(); |
| |
| UDFExpFinder(OperatorPlan plan) |
| throws FrontendException { |
| super(plan, new DependencyOrderWalker(plan)); |
| } |
| |
| @Override |
| public void visit(UserFuncExpression userFunc) { |
| mUDFList.add(userFunc); |
| } |
| |
| public List<UserFuncExpression> getUDFList() { |
| return mUDFList; |
| } |
| } |