Class GroupingState


  • public final class GroupingState
    extends java.lang.Object
    GroupMaker state.

    The state contains the primary key of the last row that has been processed by the previous GroupMaker used. It can be passed to a GroupMaker to allow to resuming the grouping.

    GroupingState is only used for internal paging. When a new page is requested by a client the initial state will always be empty.

    If the state has a partition key but no clustering, it means that the previous group ended at the end of the previous partition. If the clustering is not null it means that we are in the middle of a group.

    • Constructor Summary

      Constructors 
      Constructor Description
      GroupingState​(java.nio.ByteBuffer partitionKey, Clustering<?> clustering)  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Clustering<?> clustering()
      Returns the last row clustering or null if either no rows has been processed yet or the last row was a static row.
      boolean hasClustering()
      Checks if the state contains a Clustering for the last row that has been processed.
      java.nio.ByteBuffer partitionKey()
      Returns the last row partition key or null if no rows has been processed yet.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • GroupingState

        public GroupingState​(java.nio.ByteBuffer partitionKey,
                             Clustering<?> clustering)
    • Method Detail

      • partitionKey

        public java.nio.ByteBuffer partitionKey()
        Returns the last row partition key or null if no rows has been processed yet.
        Returns:
        the last row partition key or null if no rows has been processed yet
      • clustering

        public Clustering<?> clustering()
        Returns the last row clustering or null if either no rows has been processed yet or the last row was a static row.
        Returns:
        he last row clustering or null if either no rows has been processed yet or the last row was a static row
      • hasClustering

        public boolean hasClustering()
        Checks if the state contains a Clustering for the last row that has been processed.
        Returns:
        true if the state contains a Clustering for the last row that has been processed, false otherwise.