org.basex.data
Class DiskData

java.lang.Object
  org.basex.data.Data
      org.basex.data.DiskData

public final class DiskData
extends Data

This class stores and organizes the database table and the index structures for textual content in a compressed disk structure. The table mapping is documented in Data.

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen, Tim Petrowsky

Nested Class Summary

Nested classes/interfaces inherited from class org.basex.data.Data

Data.Type

Field Summary

Fields inherited from class org.basex.data.Data

ATTR, atts, COMM, DOC, ELEM, fs, meta, nameID, ns, path, PI, sizeID, tags, TEXT

Constructor Summary

DiskData(MetaData md, Names nm, Names at, PathSummary ps, Namespaces n)
Internal constructor, specifying all meta data.

DiskData(String db, Prop pr)
Default constructor.

Method Summary

void	closeIndex(Data.Type type) Closes the specified index.
void	cls() Internal method to close the database.
void	flush() Flushes the table data.
void	init() Dissolves the references to often used tag names and attributes.
void	setIndex(Data.Type type, Index index) Assigns the specified index.
byte[]	text(int pre, boolean text) Returns a text (text, comment, pi) or attribute value.
int	textLen(int pre, boolean text) Returns a text (text, comment, pi) length.
double	textNum(int pre, boolean text) Returns a text (text, comment, pi) as double value.

Methods inherited from class org.basex.data.Data

atom, attr, attSize, buffer, close, delete, doc, doc, elem, id, ids, info, insert, insert, insertAttr, kind, name, name, nrIDs, ns, nsFlag, parent, pre, rename, replace, size, size, text, toString, toString, uri

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DiskData

public DiskData(String db,
                Prop pr)
         throws IOException

Default constructor.

Parameters:

db - name of database

pr - database properties

Throws:

IOException - IO Exception

DiskData

public DiskData(MetaData md,
                Names nm,
                Names at,
                PathSummary ps,
                Namespaces n)
         throws IOException

Internal constructor, specifying all meta data.

Parameters:

md - meta data

nm - tags

at - attributes

ps - path summary

n - namespaces

Throws:

IOException - IO Exception

Method Detail

init

public void init()
          throws IOException

Description copied from class: Data

Dissolves the references to often used tag names and attributes.

Overrides:

init in class Data

Throws:

IOException - I/O exception

flush

public void flush()

Description copied from class: Data

Flushes the table data.

Specified by:

flush in class Data

cls

public void cls()
         throws IOException

Description copied from class: Data

Internal method to close the database.

Throws:

IOException - I/O exception

closeIndex

public void closeIndex(Data.Type type)
                throws IOException

Description copied from class: Data

Closes the specified index.

Specified by:

closeIndex in class Data

Parameters:

type - index to be closed

Throws:

IOException - I/O exception

setIndex

public void setIndex(Data.Type type,
                     Index index)

Description copied from class: Data

Assigns the specified index.

Specified by:

setIndex in class Data

Parameters:

type - index to be opened

index - index instance

text

public byte[] text(int pre,
                   boolean text)

Description copied from class: Data

Returns a text (text, comment, pi) or attribute value.

Specified by:

text in class Data

Parameters:

pre - pre value

text - text/attribute flag

Returns:

atomized value

textNum

public double textNum(int pre,
                      boolean text)

Description copied from class: Data

Returns a text (text, comment, pi) as double value.

Specified by:

textNum in class Data

Parameters:

pre - pre value

text - text/attribute flag

Returns:

numeric value

textLen

public int textLen(int pre,
                   boolean text)

Description copied from class: Data

Returns a text (text, comment, pi) length.

Specified by:

textLen in class Data

Parameters:

pre - pre value

text - text/attribute flag

Returns:

length