A simple performant implementation of the DataBag interface which only holds a single tuple. This will be used from POPreCombinerLocalRearrange and wherever else a single Tuple non-serializable DataBag is required.
| 36 | * a single Tuple non-serializable DataBag is required. |
| 37 | */ |
| 38 | public class SingleTupleBag implements DataBag { |
| 39 | |
| 40 | private static final long serialVersionUID = 1L; |
| 41 | Tuple item; |
| 42 | |
| 43 | public SingleTupleBag(Tuple t) { |
| 44 | item = t; |
| 45 | } |
| 46 | |
| 47 | /* (non-Javadoc) |
| 48 | * @see org.apache.pig.data.DataBag#add(org.apache.pig.data.Tuple) |
| 49 | * NOTE: It is the user's responsibility to ensure only a single |
| 50 | * Tuple is ever added into a SingleTupleBag |
| 51 | */ |
| 52 | @Override |
| 53 | public void add(Tuple t) { |
| 54 | item = t; |
| 55 | } |
| 56 | |
| 57 | /* (non-Javadoc) |
| 58 | * @see org.apache.pig.data.DataBag#addAll(org.apache.pig.data.DataBag) |
| 59 | */ |
| 60 | @Override |
| 61 | public void addAll(DataBag b) { |
| 62 | throw new RuntimeException("Cannot create SingleTupleBag from another DataBag"); |
| 63 | } |
| 64 | |
| 65 | /* (non-Javadoc) |
| 66 | * @see org.apache.pig.data.DataBag#clear() |
| 67 | */ |
| 68 | @Override |
| 69 | public void clear() { |
| 70 | throw new RuntimeException("Cannot clear SingleTupleBag"); |
| 71 | } |
| 72 | |
| 73 | /* (non-Javadoc) |
| 74 | * @see org.apache.pig.data.DataBag#isDistinct() |
| 75 | */ |
| 76 | @Override |
| 77 | public boolean isDistinct() { |
| 78 | return false; |
| 79 | } |
| 80 | |
| 81 | /* (non-Javadoc) |
| 82 | * @see org.apache.pig.data.DataBag#isSorted() |
| 83 | */ |
| 84 | @Override |
| 85 | public boolean isSorted() { |
| 86 | return false; |
| 87 | } |
| 88 | |
| 89 | /* (non-Javadoc) |
| 90 | * @see org.apache.pig.data.DataBag#iterator() |
| 91 | */ |
| 92 | @Override |
| 93 | public Iterator<Tuple> iterator() { |
| 94 | return new TBIterator(); |
| 95 | } |
nothing calls this directly
no outgoing calls
no test coverage detected