Module platform

Package org.jfree.data

Class KeyToGroupMap

java.lang.Object

org.jfree.data.KeyToGroupMap

All Implemented Interfaces:

Serializable, Cloneable, PublicCloneable

public class KeyToGroupMap
extends Object
implements Cloneable, PublicCloneable, Serializable

A class that maps keys (instances of Comparable) to groups.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
KeyToGroupMap()	Creates a new map with a default group named 'Default Group'.
KeyToGroupMap(Comparable defaultGroup)	Creates a new map with the specified default group.

Method Summary

Modifier and Type	Method	Description
Object	clone()	Returns a clone of the map.
boolean	equals(Object obj)	Tests the map for equality against an arbitrary object.
Comparable	getGroup(Comparable key)	Returns the group that a key is mapped to.
int	getGroupCount()	Returns the number of groups in the map.
int	getGroupIndex(Comparable group)	Returns the index for the group.
List	getGroups()	Returns a list of the groups (always including the default group) in the map.
int	getKeyCount(Comparable group)	Returns the number of keys mapped to the specified group.
void	mapKeyToGroup(Comparable key, Comparable group)	Maps a key to a group.

Methods inherited from class java.lang.Object

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

Constructor Details

KeyToGroupMap

public KeyToGroupMap()

Creates a new map with a default group named 'Default Group'.

KeyToGroupMap

public KeyToGroupMap(Comparable defaultGroup)

Creates a new map with the specified default group.

Parameters:

defaultGroup - the default group (null not permitted).

Method Details

getGroupCount

public int getGroupCount()

Returns the number of groups in the map.

Returns:

The number of groups in the map.

getGroups

public List getGroups()

Returns a list of the groups (always including the default group) in the map. The returned list is independent of the map, so altering the list will have no effect.

Returns:

The groups (never null).

getGroupIndex

public int getGroupIndex(Comparable group)

Returns the index for the group.

Parameters:

group - the group.

Returns:

The group index (or -1 if the group is not represented within the map).

getGroup

public Comparable getGroup(Comparable key)

Returns the group that a key is mapped to.

Parameters:

key - the key (null not permitted).

Returns:

The group (never null, returns the default group if there is no mapping for the specified key).

mapKeyToGroup

public void mapKeyToGroup(Comparable key,
 Comparable group)

Maps a key to a group.

Parameters:

key - the key (null not permitted).

group - the group (null permitted, clears any existing mapping).

getKeyCount

public int getKeyCount(Comparable group)

Returns the number of keys mapped to the specified group. This method won't always return an accurate result for the default group, since explicit mappings are not required for this group.

Parameters:

group - the group (null not permitted).

Returns:

The key count.

equals

public boolean equals(Object obj)

Tests the map for equality against an arbitrary object.

Overrides:

equals in class Object

Parameters:

obj - the object to test against (null permitted).

Returns:

A boolean.

clone

public Object clone()
             throws CloneNotSupportedException

Returns a clone of the map.

Specified by:

clone in interface PublicCloneable

Overrides:

clone in class Object

Returns:

A clone.

Throws:

CloneNotSupportedException - if there is a problem cloning the map.