Coverage Report - datafu.pig.bags.NullToEmptyBag
 
Classes in this File Line Coverage Branch Coverage Complexity
NullToEmptyBag
87%
7/8
66%
4/6
4
 
 1  
 /*
 2  
  * Copyright 2010 LinkedIn, Inc
 3  
  * 
 4  
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5  
  * use this file except in compliance with the License. You may obtain a copy of
 6  
  * the License at
 7  
  * 
 8  
  * http://www.apache.org/licenses/LICENSE-2.0
 9  
  * 
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 12  
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 13  
  * License for the specific language governing permissions and limitations under
 14  
  * the License.
 15  
  */
 16  
  
 17  
 package datafu.pig.bags;
 18  
 
 19  
 import java.io.IOException;
 20  
 
 21  
 import org.apache.pig.EvalFunc;
 22  
 import org.apache.pig.data.BagFactory;
 23  
 import org.apache.pig.data.DataBag;
 24  
 import org.apache.pig.data.Tuple;
 25  
 import org.apache.pig.impl.logicalLayer.schema.Schema;
 26  
 
 27  
 /**
 28  
  * UDF that, if the input is null, returns an empty bag; otherwise,
 29  
  * returns the input bag unchanged.
 30  
  */
 31  856
 public class NullToEmptyBag extends EvalFunc<DataBag>
 32  
 {
 33  
   @Override
 34  
   public DataBag exec(Tuple tuple) throws IOException
 35  
   {
 36  9
     if (tuple.size() == 0 || tuple.get(0) == null)
 37  3
       return BagFactory.getInstance().newDefaultBag();
 38  6
     Object o = tuple.get(0);
 39  6
     if (o instanceof DataBag)
 40  6
       return (DataBag)o;
 41  
     else
 42  0
       throw new IllegalArgumentException("expected a null or a bag");
 43  
   }
 44  
 
 45  
   @Override
 46  
   public Schema outputSchema(Schema input)
 47  
   {
 48  135
     return input;
 49  
   }
 50  
 }