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:

Zero or more calls of acceptCell(Object)
A call of endCells()
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

acceptCell(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 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

Interface ColumnStore

Method Summary

Method Details

acceptCell

endCells

createReader