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

    Modifier and Type
    Method
    Description
    void
    Writes a datum to this store.
    Returns an object that can provide random access to the cells written to this store.
    void
    Signals that no more calls to acceptCell will be made, and that calls to createReader may be made.
  • Method Details

    • acceptCell

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

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

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