edu.udo.cs.yale.datatable
Class SimpleDataTable

java.lang.Object
  edu.udo.cs.yale.datatable.AbstractDataTable
      edu.udo.cs.yale.datatable.SimpleDataTable

All Implemented Interfaces:

DataTable

public class SimpleDataTable
extends AbstractDataTable

A simple data table implementation which stores the data itself.

Version:

$Id: SimpleDataTable.java,v 1.11 2006/08/03 14:39:33 ingomierswa Exp $

Author:

Ingo Mierswa, Simon Fischer

Field Summary

private java.lang.String[]	columns
private java.util.List<DataTableRow>	data
private java.util.Map<java.lang.Integer,java.util.Map<java.lang.Integer,java.lang.String>>	index2StringMap
private java.lang.String	name
private boolean[]	specialColumns
private java.util.Map<java.lang.Integer,java.util.Map<java.lang.String,java.lang.Integer>>	string2IndexMap
private double[]	weights

Constructor Summary

SimpleDataTable(java.lang.String name, java.lang.String[] columns)

SimpleDataTable(java.lang.String name, java.lang.String[] columns, double[] weights)

Method Summary

void	add(DataTableRow row) Adds the given DataTableRow to the table.
void	clear()
int	getColumnIndex(java.lang.String name) Returns the column index of the column with the given name.
java.lang.String	getColumnName(int i) Returns the name of the i-th column.
java.lang.String[]	getColumnNames() Returns an array of all column names.
double	getColumnWeight(int column) Returns the weight of the column or Double.NaN if no weight is available.
java.lang.String	getName() Returns the name of this data table.
int	getNumberOfColumns() Returns the total number of columns.
int	getNumberOfRows() Returns the total number of rows.
int	getNumberOfSpecialColumns() Returns the total number of special columns.
int	getNumberOfValues(int column) Returns the number of different values for the i-th column.
DataTableRow	getRow(int index) Returns the data table row with the given index.
boolean	isNominal(int column) Indicates if the column with the given index is nominal.
boolean	isSpecial(int index) Returns true if this column is a special column which might usually not be used for some plotters, for example weights or labels.
boolean	isSupportingColumnWeights() Returns true if this data table is supporting column weights.
java.util.Iterator<DataTableRow>	iterator() Returns an iterator over all DataTableRows.
java.lang.String	mapIndex(int column, int index) If a column is nominal, the index value must be mapped to the nominal value by this method.
int	mapString(int column, java.lang.String value) If a column is nominal, the nominal value must be mapped to a (new) index by this method.
void	sample(int newSize) Performs a sampling of this data table.
void	setSpecial(int index, boolean special)

Methods inherited from class edu.udo.cs.yale.datatable.AbstractDataTable

addDataTableListener, containsMissingValues, fireEvent, getValueAsString, removeDataTableListener, write

Methods inherited from class java.lang.Object

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

Field Detail

data

private java.util.List<DataTableRow> data

name

private java.lang.String name

columns

private java.lang.String[] columns

weights

private double[] weights

specialColumns

private boolean[] specialColumns

index2StringMap

private java.util.Map<java.lang.Integer,java.util.Map<java.lang.Integer,java.lang.String>> index2StringMap

string2IndexMap

private java.util.Map<java.lang.Integer,java.util.Map<java.lang.String,java.lang.Integer>> string2IndexMap

Constructor Detail

SimpleDataTable

public SimpleDataTable(java.lang.String name,
                       java.lang.String[] columns)

SimpleDataTable

public SimpleDataTable(java.lang.String name,
                       java.lang.String[] columns,
                       double[] weights)

Method Detail

getNumberOfSpecialColumns

public int getNumberOfSpecialColumns()

Description copied from interface: DataTable

Returns the total number of special columns. Please note that these columns do not need to be in an ordered sequence. In order to make sure that a column is a special column the method DataTable.isSpecial(int) should be used.

isSpecial

public boolean isSpecial(int index)

Description copied from interface: DataTable

Returns true if this column is a special column which might usually not be used for some plotters, for example weights or labels.

setSpecial

public void setSpecial(int index,
                       boolean special)

isNominal

public boolean isNominal(int column)

Description copied from interface: DataTable

Indicates if the column with the given index is nominal. For numerical columns, the value false should be returned.

mapIndex

public java.lang.String mapIndex(int column,
                                 int index)

Description copied from interface: DataTable

If a column is nominal, the index value must be mapped to the nominal value by this method. If the given column is not nominal, this method might throw a NullPointerException.

mapString

public int mapString(int column,
                     java.lang.String value)

Description copied from interface: DataTable

If a column is nominal, the nominal value must be mapped to a (new) index by this method. If the given column is not nominal, this method might throw a NullPointerException.

getNumberOfValues

public int getNumberOfValues(int column)

Description copied from interface: DataTable

Returns the number of different values for the i-th column. Might return -1 or throw an exception if the specific column is not nominal.

isSupportingColumnWeights

public boolean isSupportingColumnWeights()

Description copied from interface: DataTable

Returns true if this data table is supporting column weights.

getColumnWeight

public double getColumnWeight(int column)

Description copied from interface: DataTable

Returns the weight of the column or Double.NaN if no weight is available.

getColumnName

public java.lang.String getColumnName(int i)

Description copied from interface: DataTable

Returns the name of the i-th column.

getColumnIndex

public int getColumnIndex(java.lang.String name)

Description copied from interface: DataTable

Returns the column index of the column with the given name.

getNumberOfColumns

public int getNumberOfColumns()

Description copied from interface: DataTable

Returns the total number of columns.

getColumnNames

public java.lang.String[] getColumnNames()

Description copied from interface: DataTable

Returns an array of all column names.

Specified by:

getColumnNames in interface DataTable

Overrides:

getColumnNames in class AbstractDataTable

getName

public java.lang.String getName()

Description copied from interface: DataTable

Returns the name of this data table.

add

public void add(DataTableRow row)

Description copied from interface: DataTable

Adds the given DataTableRow to the table.

getRow

public DataTableRow getRow(int index)

Description copied from interface: DataTable

Returns the data table row with the given index. Please note that this method is not guaranteed to be efficiently implemented. If you want to scan the complete data table you should use the iterator() method instead.

iterator

public java.util.Iterator<DataTableRow> iterator()

Description copied from interface: DataTable

Returns an iterator over all DataTableRows.

getNumberOfRows

public int getNumberOfRows()

Description copied from interface: DataTable

Returns the total number of rows.

clear

public void clear()

sample

public void sample(int newSize)

Description copied from interface: DataTable

Performs a sampling of this data table. Following operations should only work on the sample.