/*
* 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.backend.hadoop.executionengine.mapReduceLayer.plans;
import java.util.ArrayList;
import java.util.List;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.impl.plan.DepthFirstWalker;
import org.apache.pig.impl.plan.VisitorException;
public class ScalarPhyFinder extends PhyPlanVisitor {
List<PhysicalOperator> scalars = new ArrayList<PhysicalOperator>();
public ScalarPhyFinder(PhysicalPlan plan) {
super(plan, new DepthFirstWalker<PhysicalOperator, PhysicalPlan>(plan));
}
public List<PhysicalOperator> getScalars() {
return scalars;
}
@Override
public void visitUserFunc(POUserFunc userFunc) throws VisitorException {
if(userFunc.getReferencedOperator() != null) {
scalars.add(userFunc.getReferencedOperator());
}
}
}