de.erichseifert.gral.data

Interface DataSource

All Superinterfaces:

java.lang.Iterable<java.lang.Comparable<?>>

All Known Subinterfaces:

MutableDataSource

All Known Implementing Classes:

AbstractDataSource, AbstractHistogram2D, Convolution, DataSeries, DataTable, DummyData, EnumeratedData, Filter2D, Histogram2D, JdbcData, Median, Resize, RowSubset

public interface DataSource
extends java.lang.Iterable<java.lang.Comparable<?>>

Interface for an immutable access to tabular data.

See Also:

MutableDataSource

Method Summary

Modifier and Type	Method and Description
void	addDataListener(DataListener dataListener) Adds the specified DataListener to this data source.
java.lang.Comparable<?>	get(int col, int row) Returns the value with the specified row and column index.
Column<?>	getColumn(int col) Returns the column with the specified index.
int	getColumnCount() Returns the number of columns of the data source.
DataSource	getColumnStatistics(java.lang.String key)
java.lang.Class<? extends java.lang.Comparable<?>>[]	getColumnTypes() Returns the data types of all columns.
java.lang.String	getName() Returns the name of this series.
Record	getRecord(int row)
Row	getRow(int row) Returns the row with the specified index.
int	getRowCount() Returns the number of rows of the data source.
DataSource	getRowStatistics(java.lang.String key)
Statistics	getStatistics() Retrieves a object instance that contains various statistical information on the current data source.
boolean	isColumnNumeric(int columnIndex) Returns whether the column at the specified index contains numbers.
void	removeDataListener(DataListener dataListener) Removes the specified DataListener from this data source.

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

Method Detail

getColumn

Column<?> getColumn(int col)

Returns the column with the specified index.

Parameters:

col - index of the column to return

Returns:

the specified column of the data source

getColumnTypes

java.lang.Class<? extends java.lang.Comparable<?>>[] getColumnTypes()

Returns the data types of all columns.

Returns:

The data types of all column in the data source

getRow

Row getRow(int row)

Returns the row with the specified index.

Parameters:

row - index of the row to return

Returns:

the specified row of the data source

get

java.lang.Comparable<?> get(int col,
                            int row)

Returns the value with the specified row and column index.

Parameters:

col - index of the column to return

row - index of the row to return

Returns:

the specified value of the data cell

getStatistics

Statistics getStatistics()

Retrieves a object instance that contains various statistical information on the current data source.

Returns:

statistical information

getColumnStatistics

DataSource getColumnStatistics(java.lang.String key)

getRowStatistics

DataSource getRowStatistics(java.lang.String key)

getRowCount

int getRowCount()

Returns the number of rows of the data source.

Returns:

number of rows in the data source.

getName

java.lang.String getName()

Returns the name of this series.

Returns:

a name string

getColumnCount

int getColumnCount()

Returns the number of columns of the data source.

Returns:

number of columns in the data source.

isColumnNumeric

boolean isColumnNumeric(int columnIndex)

Returns whether the column at the specified index contains numbers.

Parameters:

columnIndex - Index of the column to test.

Returns:

true if the column is numeric, otherwise false.

addDataListener

void addDataListener(DataListener dataListener)

Adds the specified DataListener to this data source.

Parameters:

dataListener - listener to be added.

removeDataListener

void removeDataListener(DataListener dataListener)

Removes the specified DataListener from this data source.

Parameters:

dataListener - listener to be removed.

getRecord

Record getRecord(int row)