Package adams.data.io.input

Class SqlDumpSpreadSheetReader.ChunkReader

java.lang.Object

adams.data.io.input.SqlDumpSpreadSheetReader.ChunkReader

All Implemented Interfaces:

Serializable

Enclosing class:

SqlDumpSpreadSheetReader

public static class SqlDumpSpreadSheetReader.ChunkReader
extends Object
implements Serializable

Reads CSV files chunk by chunk.

Version:

$Revision$

Author:

fracpete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	m_ChunkSize	the chunk size.
protected SpreadSheet	m_Header	the header.
protected List<String>	m_HeaderCells	the header cells to use.
protected SqlDumpSpreadSheetReader	m_Owner	the owning reader.
protected BufferedReader	m_Reader	the reader in use.
protected boolean	m_UseBackslashes	whether to backslashes are used for escaping single quotes.

Constructor Summary

Constructors

Constructor	Description
ChunkReader(SqlDumpSpreadSheetReader owner)	Initializes the low-level reader.

Method Summary

Modifier and Type	Method	Description
boolean	hasNext()	Returns whether there is more data to be read.
SpreadSheet	next()	Reads the next chunk.
SpreadSheet	read(Reader r, int chunkSize)	Reads the spreadsheet content from the specified reader.
protected List<String>	readCells(Reader reader)	Reads a row and breaks it up into cells.
protected void	removeTrailingCR(StringBuilder current)	Removes a trailing CR.
protected String	unquote(String s)	Unquotes the given string.

Methods inherited from class java.lang.Object

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

Field Detail

m_Owner

protected SqlDumpSpreadSheetReader m_Owner

the owning reader.

m_Reader

protected BufferedReader m_Reader

the reader in use.

m_Header

protected SpreadSheet m_Header

the header.

m_ChunkSize

protected int m_ChunkSize

the chunk size.

m_UseBackslashes

protected boolean m_UseBackslashes

whether to backslashes are used for escaping single quotes.

m_HeaderCells

protected List<String> m_HeaderCells

the header cells to use.

Constructor Detail

ChunkReader

public ChunkReader(SqlDumpSpreadSheetReader owner)

Initializes the low-level reader.

Parameters:

owner - the owning reader

Method Detail

unquote

protected String unquote(String s)

Unquotes the given string.

Parameters:

s - the string to unquote, if necessary

Returns:

the processed string

removeTrailingCR

protected void removeTrailingCR(StringBuilder current)

Removes a trailing CR.

Parameters:

current - the current buffer

readCells

protected List<String> readCells(Reader reader)
                          throws IOException

Reads a row and breaks it up into cells.

Parameters:

reader - the reader to read from

Returns:

the cells, null if nothing could be read (EOF)

Throws:

IOException - if reading fails, e.g., due to IO error

next

public SpreadSheet next()

Reads the next chunk.

Returns:

the next chunk

hasNext

public boolean hasNext()

Returns whether there is more data to be read.

Returns:

true if more data available

read

public SpreadSheet read(Reader r,
                        int chunkSize)

Reads the spreadsheet content from the specified reader.

Parameters:

r - the reader to read from

chunkSize - the number of rows to read at a time

Returns:

the spreadsheet or null in case of an error