StreamColumnStore (Starjava Table API)

java.lang.Object

uk.ac.starlink.table.storage.StreamColumnStore

All Implemented Interfaces:: ColumnStore

public class StreamColumnStore extends Object implements ColumnStore

ColumnStore implementation which uses a streamed file to store a variable number of fixed-length data items.

Since:: 21 Jun 2006
Author:: Mark Taylor

Constructor Summary

Constructors

Constructor

Description

StreamColumnStore(Codec codec, File dataFile)

Constructor.
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.

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- StreamColumnStore
  
  public StreamColumnStore(Codec codec, File dataFile) throws IOException
  
  Constructor.
  
  Parameters:
  
  codec - encoder/decoder for the type of data stored in this column
  
  dataFile - filename used for storing the data; it is the caller's responsibility to clear this up
  
  Throws:
  
  IOException
Method Details
- acceptCell
  
  public void acceptCell(Object value) throws IOException
  
  Description copied from interface: ColumnStore
  
  Writes a datum to this store.
  
  Specified by:
  
  acceptCell in interface ColumnStore
  
  Parameters:
  
  value - the value to add
  
  Throws:
  
  IOException
- endCells
  
  public void endCells() throws IOException
  
  Description copied from interface: ColumnStore
  
  Signals that no more calls to acceptCell will be made, and that calls to createReader may be made.
  
  Specified by:
  
  endCells in interface ColumnStore
  
  Throws:
  
  IOException
- createReader
  
  public ColumnReader createReader()
  
  Description copied from interface: ColumnStore
  
  Returns an object that can provide random access to the cells written to this store.
  
  Specified by:
  
  createReader in interface ColumnStore
  
  Returns:
  
  column cell reader