Interface ColumnStore

  • All Known Implementing Classes:
    IndexedStreamColumnStore, StreamColumnStore

    public interface ColumnStore
    Defines an object which can store the data of a column, that is, an array of homogeneous objects. The store is populated sequentially, and when ready provides random access.

    The sequence of calls must be as follows:

    1. Zero or more calls of acceptCell(java.lang.Object)
    2. A call of endCells()
    3. Zero or more calls of createReader()
    Behaviour will be undefined if you violate this sequence.
    Since:
    21 Jun 2006
    Author:
    Mark Taylor
    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      void acceptCell​(java.lang.Object value)
      Writes a datum to this store.
      ColumnReader createReader()
      Returns an object that can provide random access to the cells written to this store.
      void endCells()
      Signals that no more calls to acceptCell will be made, and that calls to createReader may be made.
    • Method Detail

      • acceptCell

        void acceptCell​(java.lang.Object value)
                 throws java.io.IOException
        Writes a datum to this store.
        Parameters:
        value - the value to add
        Throws:
        java.io.IOException
      • endCells

        void endCells()
               throws java.io.IOException
        Signals that no more calls to acceptCell will be made, and that calls to createReader may be made.
        Throws:
        java.io.IOException
      • createReader

        ColumnReader createReader()
        Returns an object that can provide random access to the cells written to this store.
        Returns:
        column cell reader