uk.ac.starlink.table.storage

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 and 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 Detail

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