org.jfree.data
Class CategoryToPieDataset

java.lang.Object
  |
  +--org.jfree.data.AbstractDataset
        |
        +--org.jfree.data.CategoryToPieDataset

All Implemented Interfaces:

Dataset, KeyedValues, PieDataset, java.io.Serializable, Values

public class CategoryToPieDataset

extends AbstractDataset

implements PieDataset

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

Author:

David Gilbert

See Also:

Serialized Form

Field Summary

static int	COLUMN A constant indicating that data should be extracted from a column.
static int	ROW A constant indicating that data should be extracted from a row.

Constructor Summary

CategoryToPieDataset(CategoryDataset source, int 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

int	getIndex(java.lang.Comparable key) Returns the index for a given key.
int	getItemCount() Returns the number of items (values) in the collection.
java.lang.Comparable	getKey(int index) Returns a key.
java.util.List	getKeys() Returns the keys.
java.lang.Number	getValue(java.lang.Comparable key) Returns the value (possibly null) for a given key.
java.lang.Number	getValue(int item) Returns a value.

Methods inherited from class org.jfree.data.AbstractDataset

addChangeListener, fireDatasetChanged, getGroup, notifyListeners, removeChangeListener, setGroup

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jfree.data.Dataset

addChangeListener, getGroup, removeChangeListener, setGroup

Field Detail

ROW

public static final int ROW

A constant indicating that data should be extracted from a row.

See Also:

Constant Field Values

COLUMN

public static final int COLUMN

A constant indicating that data should be extracted from a column.

See Also:

Constant Field Values

Constructor Detail

CategoryToPieDataset

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

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

Parameters:

source - the source dataset.

extract - ROW or COLUMN.

index - the row or column index.

Method Detail

getItemCount

public int getItemCount()

Returns the number of items (values) in the collection.

Specified by:

getItemCount in interface Values

Returns:

the item count.

getValue

public java.lang.Number getValue(int item)

Returns a value.

Specified by:

getValue in interface Values

Parameters:

item - the item index (zero-based).

Returns:

the value.

getKey

public java.lang.Comparable getKey(int index)

Returns a key.

Specified by:

getKey in interface KeyedValues

Parameters:

index - the item index (zero-based).

Returns:

the key.

getIndex

public int getIndex(java.lang.Comparable key)

Returns the index for a given key.

Specified by:

getIndex in interface KeyedValues

Parameters:

key - the key.

Returns:

the index.

getKeys

public java.util.List getKeys()

Returns the keys.

Specified by:

getKeys in interface KeyedValues

Returns:

the keys.

getValue

public java.lang.Number getValue(java.lang.Comparable key)

Returns the value (possibly null) for a given key.

If the key is not recognised, the method should return null.

Specified by:

getValue in interface KeyedValues

Parameters:

key - the key.

Returns:

the value.