/*
* 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;
}
}