| /* |
| * 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.test; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.pig.data.DataBag; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.plan.OperatorKey; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| /** |
| * This operator is used to read tuples from a databag in memory. Used mostly |
| * for testing. It'd also be useful for the example generator |
| * |
| */ |
| public class PORead extends PhysicalOperator { |
| private static final long serialVersionUID = 1L; |
| DataBag bag; |
| transient Iterator<Tuple> it; |
| |
| public PORead(OperatorKey k) { |
| super(k); |
| // TODO Auto-generated constructor stub |
| } |
| |
| public PORead(OperatorKey k, int rp, List<PhysicalOperator> inp) { |
| super(k, rp, inp); |
| // TODO Auto-generated constructor stub |
| } |
| |
| public PORead(OperatorKey k, int rp) { |
| super(k, rp); |
| // TODO Auto-generated constructor stub |
| } |
| |
| public PORead(OperatorKey k, List<PhysicalOperator> inp) { |
| super(k, inp); |
| // TODO Auto-generated constructor stub |
| } |
| |
| public PORead(OperatorKey k, DataBag bag) { |
| super(k); |
| this.bag = bag; |
| } |
| |
| @Override |
| public Result getNextTuple() { |
| if (it == null) { |
| it = bag.iterator(); |
| } |
| Result res = new Result(); |
| if (it.hasNext()) { |
| res.returnStatus = POStatus.STATUS_OK; |
| res.result = it.next(); |
| } else { |
| res.returnStatus = POStatus.STATUS_EOP; |
| } |
| return res; |
| } |
| |
| @Override |
| public String name() { |
| // TODO Auto-generated method stub |
| return "PORead - " + mKey.toString(); |
| } |
| |
| @Override |
| public boolean supportsMultipleInputs() { |
| // TODO Auto-generated method stub |
| return false; |
| } |
| |
| @Override |
| public boolean supportsMultipleOutputs() { |
| // TODO Auto-generated method stub |
| return false; |
| } |
| |
| @Override |
| public void visit(PhyPlanVisitor v) throws VisitorException { |
| // TODO Auto-generated method stub |
| throw new VisitorException("Vistor not accepted !"); |
| } |
| |
| @Override |
| public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex) { |
| return null; |
| } |
| } |