mdbtools.dbengine

Class MemoryData

java.lang.Object

mdbtools.dbengine.MemoryData

All Implemented Interfaces:

Data

Direct Known Subclasses:

RewindableData

public class MemoryData
extends Object
implements Data

An implementation of Data that stores the complete result in memory

Field Summary

Fields

Modifier and Type	Field and Description
protected int	currentRow
private ArrayList	rows

Constructor Summary

Constructors

Constructor and Description
MemoryData()
MemoryData(Data data, int numColumns)

Method Summary

Methods

Modifier and Type	Method and Description
void	addRow(Object[] row) Add a row of data
void	dump()
private int	findDifferent(int column, int start)
Object	get(int index) get the data at a certain column
Object[]	getRow(int index)
boolean	next() goto the next (or first) row
void	sort(int[] sortBy, boolean[] ascending) sort the data set by the given columns each column is sorted seperate
private void	sort(int columnToSort, int startAt, int endAt, boolean ascending) sort the data by the given column using only the given rows insertion sort is used for the sort todo: replace with a better sorting algorithm

Methods inherited from class java.lang.Object

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

Field Detail

currentRow

protected int currentRow

rows

private ArrayList rows

Constructor Detail

MemoryData

public MemoryData()

MemoryData

public MemoryData(Data data,
          int numColumns)
           throws SQLException

Throws:

SQLException

Method Detail

next

public boolean next()
             throws SQLException

goto the next (or first) row

Specified by:

next in interface Data

Returns:

true if row exits, false if not

Throws:

SQLException

get

public Object get(int index)

get the data at a certain column

Specified by:

get in interface Data

Parameters:

index - the column to get

getRow

public Object[] getRow(int index)

addRow

public void addRow(Object[] row)

Add a row of data

sort

public void sort(int[] sortBy,
        boolean[] ascending)
          throws SQLException

sort the data set by the given columns each column is sorted seperate

Throws:

SQLException

findDifferent

private int findDifferent(int column,
                int start)

sort

private void sort(int columnToSort,
        int startAt,
        int endAt,
        boolean ascending)

sort the data by the given column using only the given rows insertion sort is used for the sort todo: replace with a better sorting algorithm

Parameters:

columnToSort - the column to sort

startAt - the row to start sorting at

endAt - the row to end sorting at

ascending - true for ascending order, false for descending order

dump

public void dump()