Package com.mckoi.database

Class GTStatisticsDataSource

java.lang.Object

com.mckoi.database.GTDataSource

com.mckoi.database.GTStatisticsDataSource

All Implemented Interfaces:

MutableTableDataSource, TableDataSource

final class GTStatisticsDataSource
extends GTDataSource

An implementation of MutableTableDataSource that presents database statistical information.

NOTE: This is not designed to be a long kept object. It must not last beyond the lifetime of a transaction.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static DataTableDef	DEF_DATA_TABLE_DEF	The data table def that describes this table of data source.
private java.lang.String[]	statistics_info	Contains all the statistics information for this session.
private Stats	stats	The system database stats.

Constructor Summary

Constructors

Constructor	Description
GTStatisticsDataSource(DatabaseConnection connection)	Constructor.

Method Summary

Modifier and Type	Method	Description
void	dispose()	Disposes this table data source.
TObject	getCellContents(int column, int row)	Returns an object that represents the information in the given cell in the table.
DataTableDef	getDataTableDef()	Returns a DataTableDef object that defines the layout of the table that this data is in.
int	getRowCount()	Returns the number of rows in this data source.
GTStatisticsDataSource	init()	Initialize the data source.

Methods inherited from class com.mckoi.database.GTDataSource

addRootLock, addRow, booleanColumn, columnValue, constraintIntegrityCheck, dateColumn, flushIndexChanges, getColumnScheme, getJournal, getSystem, numericColumn, removeRootLock, removeRow, rowEnumeration, stringColumn, updateRow

Methods inherited from class java.lang.Object

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

Field Detail

statistics_info

private java.lang.String[] statistics_info

Contains all the statistics information for this session.

stats

private Stats stats

The system database stats.

DEF_DATA_TABLE_DEF

static final DataTableDef DEF_DATA_TABLE_DEF

The data table def that describes this table of data source.

Constructor Detail

GTStatisticsDataSource

public GTStatisticsDataSource(DatabaseConnection connection)

Constructor.

Method Detail

init

public GTStatisticsDataSource init()

Initialize the data source.

getDataTableDef

public DataTableDef getDataTableDef()

Description copied from interface: TableDataSource

Returns a DataTableDef object that defines the layout of the table that this data is in.

This may return 'null' if there is no table definition.

Specified by:

getDataTableDef in interface TableDataSource

Specified by:

getDataTableDef in class GTDataSource

getRowCount

public int getRowCount()

Description copied from interface: TableDataSource

Returns the number of rows in this data source.

NOTE: Returns 'n' - getCellContents(column, row) is not necessarily valid for row = [0..n]. Use 'rowEnumerator' to generate an iterator for valid row values over this data source.

Specified by:

getRowCount in interface TableDataSource

Specified by:

getRowCount in class GTDataSource

getCellContents

public TObject getCellContents(int column,
                               int row)

Description copied from interface: TableDataSource

Returns an object that represents the information in the given cell in the table. This may be an expensive operation, so calls to it should be kept to a minimum. Note that the offset between two rows is not necessarily 1. Use 'rowEnumeration' to create a row iterator.

Specified by:

getCellContents in interface TableDataSource

Specified by:

getCellContents in class GTDataSource

dispose

public void dispose()

Description copied from interface: MutableTableDataSource

Disposes this table data source. After this method is called, most use of this object is undefined, except for the 'getCellContent' and 'compareCellContent' methods which are valid provided the source is under a root lock.

Specified by:

dispose in interface MutableTableDataSource

Overrides:

dispose in class GTDataSource