de.erichseifert.gral.data

Class AbstractDataSource

java.lang.Object

de.erichseifert.gral.data.AbstractDataSource

All Implemented Interfaces:

DataSource, java.io.Serializable, java.lang.Iterable<java.lang.Comparable<?>>

Direct Known Subclasses:

AbstractHistogram2D, DataSeries, DataTable, DummyData, EnumeratedData, Filter2D, JdbcData, RowSubset

public abstract class AbstractDataSource
extends java.lang.Object
implements DataSource, java.io.Serializable

Abstract implementation of the DataSource interface. This class provides access to statistical information, administration and notification of listeners and supports iteration of data values.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AbstractDataSource()
AbstractDataSource(java.lang.Class<? extends java.lang.Comparable<?>>... types) Initializes a new instance with the specified number of columns and column types.
AbstractDataSource(Column... remainingColumns)
AbstractDataSource(java.lang.String name, java.lang.Class<? extends java.lang.Comparable<?>>... types) Initializes a new instance with the specified name, number of columns, and column types.

Method Summary

Modifier and Type	Method and Description
void	addDataListener(DataListener dataListener) Adds the specified DataListener to this data source.
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.
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.
java.util.Iterator<java.lang.Comparable<?>>	iterator() Returns an iterator over a set of elements of type T.
void	removeDataListener(DataListener dataListener) Removes the specified DataListener from this data source.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.erichseifert.gral.data.DataSource

get, getRowCount

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

AbstractDataSource

public AbstractDataSource()

AbstractDataSource

public AbstractDataSource(java.lang.String name,
                          java.lang.Class<? extends java.lang.Comparable<?>>... types)

Initializes a new instance with the specified name, number of columns, and column types.

Parameters:

name - name of the DataSource

types - type for each column

AbstractDataSource

public AbstractDataSource(java.lang.Class<? extends java.lang.Comparable<?>>... types)

Initializes a new instance with the specified number of columns and column types.

Parameters:

types - type for each column

AbstractDataSource

public AbstractDataSource(Column... remainingColumns)

Method Detail

getStatistics

public Statistics getStatistics()

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

Specified by:

getStatistics in interface DataSource

Returns:

statistical information

getColumnStatistics

public DataSource getColumnStatistics(java.lang.String key)

Specified by:

getColumnStatistics in interface DataSource

getRowStatistics

public DataSource getRowStatistics(java.lang.String key)

Specified by:

getRowStatistics in interface DataSource

addDataListener

public void addDataListener(DataListener dataListener)

Adds the specified DataListener to this data source.

Specified by:

addDataListener in interface DataSource

Parameters:

dataListener - listener to be added.

removeDataListener

public void removeDataListener(DataListener dataListener)

Removes the specified DataListener from this data source.

Specified by:

removeDataListener in interface DataSource

Parameters:

dataListener - listener to be removed.

iterator

public java.util.Iterator<java.lang.Comparable<?>> iterator()

Returns an iterator over a set of elements of type T.

Specified by:

iterator in interface java.lang.Iterable<java.lang.Comparable<?>>

Returns:

an Iterator.

getColumn

public Column<?> getColumn(int col)

Returns the column with the specified index.

Specified by:

getColumn in interface DataSource

Parameters:

col - index of the column to return

Returns:

the specified column of the data source

getName

public java.lang.String getName()

Description copied from interface: DataSource

Returns the name of this series.

Specified by:

getName in interface DataSource

Returns:

a name string

getRecord

public Record getRecord(int row)

Specified by:

getRecord in interface DataSource

getColumnCount

public int getColumnCount()

Returns the number of columns of the data source.

Specified by:

getColumnCount in interface DataSource

Returns:

number of columns in the data source.

getColumnTypes

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

Returns the data types of all columns.

Specified by:

getColumnTypes in interface DataSource

Returns:

The data types of all column in the data source

isColumnNumeric

public boolean isColumnNumeric(int columnIndex)

Returns whether the column at the specified index contains numbers.

Specified by:

isColumnNumeric in interface DataSource

Parameters:

columnIndex - Index of the column to test.

Returns:

true if the column is numeric, otherwise false.

getRow

public Row getRow(int row)

Returns the row with the specified index.

Specified by:

getRow in interface DataSource

Parameters:

row - Index of the row to return

Returns:

the Specified row of the data source