KvSwap (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

com.google.cloud.dataflow.sdk.transforms

Class KvSwap<K,V>

  • Type Parameters:
    K - the type of the keys in the input PCollection and the values in the output PCollection
    V - the type of the values in the input PCollection and the keys in the output PCollection
    All Implemented Interfaces:
    HasDisplayData, Serializable


    public class KvSwap<K,V>
    extends PTransform<PCollection<KV<K,V>>,PCollection<KV<V,K>>>
    KvSwap<K, V> takes a PCollection<KV<K, V>> and returns a PCollection<KV<V, K>>, where all the keys and values have been swapped.

    Example of use:

     
     PCollection<String, Long> wordsToCounts = ...;
     PCollection<Long, String> countsToWords =
         wordToCounts.apply(KvSwap.<String, Long>create());
      

    Each output element has the same timestamp and is in the same windows as its corresponding input element, and the output PCollection has the same WindowFn associated with it as the input.

    See Also:
    Serialized Form
    • Method Detail

      • create

        public static <K,V> KvSwap<K,V> create()
        Returns a KvSwap<K, V> PTransform.
        Type Parameters:
        K - the type of the keys in the input PCollection and the values in the output PCollection
        V - the type of the values in the input PCollection and the keys in the output PCollection


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