Coverage Report - datafu.pig.bags.AppendToBag
 
Classes in this File Line Coverage Branch Coverage Complexity
AppendToBag
66%
4/6
N/A
2
 
 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.data.DataBag;
 22  
 import org.apache.pig.data.DataType;
 23  
 import org.apache.pig.data.Tuple;
 24  
 import org.apache.pig.impl.logicalLayer.FrontendException;
 25  
 import org.apache.pig.impl.logicalLayer.schema.Schema;
 26  
 
 27  
 import datafu.pig.util.SimpleEvalFunc;
 28  
 
 29  
 /**
 30  
  * Appends a tuple to a bag.
 31  
  * <p>
 32  
  * Example:
 33  
  * <pre>
 34  
  * {@code
 35  
  * define AppendToBag datafu.pig.bags.AppendToBag();
 36  
  * 
 37  
  * -- input:
 38  
  * -- ({(1),(2),(3)},(4))
 39  
  * -- ({(10),(20),(30),(40),(50)},(60))
 40  
  * input = LOAD 'input' AS (B: bag{T: tuple(v:INT)}, T: tuple(v:INT));
 41  
 
 42  
  * -- output:
 43  
  * -- ({(1),(2),(3),(4)})
 44  
  * -- ({(10),(20),(30),(40),(50),(60)})
 45  
  * output = FOREACH input GENERATE AppendToBag(B,T) as B;
 46  
  * }
 47  
  * </pre>
 48  
  */
 49  1279
 public class AppendToBag extends SimpleEvalFunc<DataBag>
 50  
 {
 51  
   public DataBag call(DataBag inputBag, Tuple t) throws IOException
 52  
   {
 53  2
     inputBag.add(t);
 54  2
     return inputBag;
 55  
   }
 56  
 
 57  
   @Override
 58  
   public Schema outputSchema(Schema input)
 59  
   {
 60  
     try {
 61  277
       return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input),
 62  
               input.getField(0).schema, DataType.BAG));
 63  
     }
 64  0
     catch (FrontendException e) {
 65  0
       return null;
 66  
     }
 67  
   }
 68  
 }