Module platform

Package org.jfree.data.category

Class CategoryToPieDataset

java.lang.Object

org.jfree.data.general.AbstractDataset

org.jfree.data.category.CategoryToPieDataset

All Implemented Interfaces:

ObjectInputValidation, Serializable, Cloneable, EventListener, Dataset, DatasetChangeListener, PieDataset, KeyedValues, Values

public class CategoryToPieDataset
extends AbstractDataset
implements PieDataset, DatasetChangeListener

A PieDataset implementation that obtains its data from one row or column of a CategoryDataset.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
CategoryToPieDataset(CategoryDataset source, TableOrder extract, int index)	An adaptor class that converts any CategoryDataset into a PieDataset, by taking the values from a single row or column.

Method Summary

Modifier and Type	Method	Description
void	datasetChanged(DatasetChangeEvent event)	Sends a DatasetChangeEvent to all registered listeners, with this (not the underlying) dataset as the source.
boolean	equals(Object obj)	Tests this dataset for equality with an arbitrary object, returning true if obj is a dataset containing the same keys and values in the same order as this dataset.
int	getExtractIndex()	Returns the index of the row or column from which to extract the data.
TableOrder	getExtractType()	Returns the extract type, which determines whether data is read from one row or one column of the underlying dataset.
int	getIndex(Comparable key)	Returns the index for a given key, or -1 if there is no such key.
int	getItemCount()	Returns the number of items (values) in the collection.
Comparable	getKey(int index)	Returns the key at the specified index.
List	getKeys()	Returns the keys for the dataset.
CategoryDataset	getUnderlyingDataset()	Returns the underlying dataset.
Number	getValue(int item)	Returns a value from the dataset.
Number	getValue(Comparable key)	Returns the value for a given key.

Methods inherited from class org.jfree.data.general.AbstractDataset

addChangeListener, clone, fireDatasetChanged, getGroup, getNotify, hasListener, notifyListeners, removeChangeListener, setGroup, setNotify, validateObject

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jfree.data.general.Dataset

addChangeListener, getGroup, removeChangeListener, setGroup

Constructor Details

CategoryToPieDataset

public CategoryToPieDataset(CategoryDataset source,
 TableOrder extract,
 int index)

An adaptor class that converts any CategoryDataset into a PieDataset, by taking the values from a single row or column.

If source is null, the created dataset will be empty.

Parameters:

source - the source dataset (null permitted).

extract - extract data from rows or columns? (null not permitted).

index - the row or column index.

Method Details

getUnderlyingDataset

public CategoryDataset getUnderlyingDataset()

Returns the underlying dataset.

Returns:

The underlying dataset (possibly null).

getExtractType

public TableOrder getExtractType()

Returns the extract type, which determines whether data is read from one row or one column of the underlying dataset.

Returns:

The extract type.

getExtractIndex

public int getExtractIndex()

Returns the index of the row or column from which to extract the data.

Returns:

The extract index.

getItemCount

public int getItemCount()

Returns the number of items (values) in the collection. If the underlying dataset is null, this method returns zero.

Specified by:

getItemCount in interface Values

Returns:

The item count.

getValue

public Number getValue(int item)

Returns a value from the dataset.

Specified by:

getValue in interface Values

Parameters:

item - the item index (zero-based).

Returns:

The value (possibly null).

Throws:

IndexOutOfBoundsException - if item is not in the range 0 to getItemCount() -1.

getKey

public Comparable getKey(int index)

Returns the key at the specified index.

Specified by:

getKey in interface KeyedValues

Parameters:

index - the item index (in the range 0 to getItemCount() -1).

Returns:

The key.

Throws:

IndexOutOfBoundsException - if index is not in the specified range.

getIndex

public int getIndex(Comparable key)

Returns the index for a given key, or -1 if there is no such key.

Specified by:

getIndex in interface KeyedValues

Parameters:

key - the key.

Returns:

The index for the key, or -1.

getKeys

public List getKeys()

Returns the keys for the dataset.

If the underlying dataset is null, this method returns an empty list.

Specified by:

getKeys in interface KeyedValues

Returns:

The keys.

getValue

public Number getValue(Comparable key)

Returns the value for a given key. If the key is not recognised, the method should return null (but note that null can be associated with a valid key also).

Specified by:

getValue in interface KeyedValues

Parameters:

key - the key.

Returns:

The value (possibly null).

datasetChanged

public void datasetChanged(DatasetChangeEvent event)

Sends a DatasetChangeEvent to all registered listeners, with this (not the underlying) dataset as the source.

Specified by:

datasetChanged in interface DatasetChangeListener

Parameters:

event - the event (ignored, a new event with this dataset as the source is sent to the listeners).

equals

public boolean equals(Object obj)

Tests this dataset for equality with an arbitrary object, returning true if obj is a dataset containing the same keys and values in the same order as this dataset.

Overrides:

equals in class Object

Parameters:

obj - the object to test (null permitted).

Returns:

A boolean.