org.maverickdbms.basic
Class SequentialFile

java.lang.Object
  org.maverickdbms.basic.SequentialFile

All Implemented Interfaces:

Variable

public class SequentialFile

extends java.lang.Object

implements Variable

SequentialFile provides an implementartion of a MV sequential file.

Field Summary

protected java.io.RandomAccessFile

file

Constructor Summary

SequentialFile()

Method Summary

ConstantString	CLOSESEQ() Close sequential file.
mvString	FILEINFO(mvString result, ConstantString code)
ConstantString	OPENSEQ(ConstantString name, boolean readonly) Open sequential file.
ConstantString	OPENSEQ(ConstantString dir, ConstantString name, boolean readonly) Open sequential file.
ConstantString	READBLK(mvString var, ConstantString blksize) Read a set number of bytes from current file position.
ConstantString	READSEQ(mvString var) Read record from current file position.
ConstantString	SEEK(ConstantString offset, ConstantString relto)
ConstantString	WRITEBLK(mvString var)
ConstantString	WRITESEQ(ConstantString var, boolean append) Write record at current filepostion.
ConstantString	WRITESEQF(ConstantString var, boolean append) Write record and flush.

Methods inherited from class java.lang.Object

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

Field Detail

file

protected java.io.RandomAccessFile file

Constructor Detail

SequentialFile

public SequentialFile()

Method Detail

CLOSESEQ

public ConstantString CLOSESEQ()
                        throws mvException

Close sequential file.

Throws:

mvException

FILEINFO

public mvString FILEINFO(mvString result,
                         ConstantString code)
                  throws mvException

Throws:

mvException

OPENSEQ

public ConstantString OPENSEQ(ConstantString name,
                              boolean readonly)
                       throws mvException

Open sequential file.

Throws:

mvException

OPENSEQ

public ConstantString OPENSEQ(ConstantString dir,
                              ConstantString name,
                              boolean readonly)
                       throws mvException

Open sequential file.

Throws:

mvException

READBLK

public ConstantString READBLK(mvString var,
                              ConstantString blksize)

Read a set number of bytes from current file position.

Parameters:

var - variable to hold the read data

blksize - length of data to read

Returns:

SUCCESS if successful ELSE if error

READSEQ

public ConstantString READSEQ(mvString var)

Read record from current file position.

SEEK

public ConstantString SEEK(ConstantString offset,
                           ConstantString relto)

WRITEBLK

public ConstantString WRITEBLK(mvString var)

WRITESEQ

public ConstantString WRITESEQ(ConstantString var,
                               boolean append)
                        throws mvException

Write record at current filepostion.

Throws:

mvException

WRITESEQF

public ConstantString WRITESEQF(ConstantString var,
                                boolean append)
                         throws mvException

Write record and flush.

Throws:

mvException