adams.flow.source
Class SpreadSheetDbReader.ChunkReader

java.lang.Object
  adams.flow.source.SpreadSheetDbReader.ChunkReader

All Implemented Interfaces:

Serializable

Enclosing class:

SpreadSheetDbReader

public static class SpreadSheetDbReader.ChunkReader
extends Object
implements Serializable

For reading data from the database in chunks.

Version:

$Revision: 6549 $

Author:

fracpete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Field Summary

protected int	m_ChunkSize the chunk size.
protected SpreadSheet	m_Header the header.
protected SpreadSheetDbReader	m_Owner the owner.
protected ResultSet	m_ResultSet the resultset in use.
protected int[]	m_Type the column types.

Constructor Summary

SpreadSheetDbReader.ChunkReader(SpreadSheetDbReader owner)
Initializes the reader.

Method Summary

boolean	hasNext() Returns whether there is more data to be read.
SpreadSheet	next() Reads the next chunk.
SpreadSheet	read(ResultSet rs, int chunkSize) Reads the first chunk.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_Owner

protected SpreadSheetDbReader m_Owner

the owner.

m_ChunkSize

protected int m_ChunkSize

the chunk size.

m_ResultSet

protected ResultSet m_ResultSet

the resultset in use.

m_Header

protected SpreadSheet m_Header

the header.

m_Type

protected int[] m_Type

the column types.

Constructor Detail

SpreadSheetDbReader.ChunkReader

public SpreadSheetDbReader.ChunkReader(SpreadSheetDbReader owner)

Initializes the reader.

Parameters:

owner - the owning DB reader

Method Detail

read

public SpreadSheet read(ResultSet rs,
                        int chunkSize)

Reads the first chunk.

Parameters:

rs - the resultset to read from

chunkSize - the size of the chunks, -1 for infinity

Returns:

the first chunk

hasNext

public boolean hasNext()

Returns whether there is more data to be read.

Returns:

true if more data available

next

public SpreadSheet next()

Reads the next chunk.

Returns:

the next chunk