Class PreferencesModel

java.lang.Object
  java.util.Observable
      PreferencesModel

All Implemented Interfaces:

java.util.EventListener, java.util.prefs.NodeChangeListener, java.util.prefs.PreferenceChangeListener

public class PreferencesModel

extends java.util.Observable

implements java.util.prefs.NodeChangeListener, java.util.prefs.PreferenceChangeListener

The model where all modifications to the preferences store are done. Uses the Observer pattern to notify the views when the model changes. This singleton class effectively adds the idea of a 'current node' to the java preferences node heirarchy.

Method Summary

void	childAdded(java.util.prefs.NodeChangeEvent evt)
void	childRemoved(java.util.prefs.NodeChangeEvent evt)
java.util.prefs.Preferences	deleteNode() Deletes the current node and its children
java.util.prefs.Preferences	getCurrentNode() Gets the current preferences node
static PreferencesModel	Instance() Singleton accessor
java.util.prefs.Preferences	newNode(java.lang.String sNodeName) Creates a new node as a child of the current node
void	preferenceChange(java.util.prefs.PreferenceChangeEvent evt)
void	removeAttribute(java.lang.String sKey) Removes the attribute sKey of the current node
void	renameAttribute(java.lang.String sOldKey, java.lang.String sNewKey) Renames the attribute sOldKey of the current node
void	setAttribute(java.lang.String sKey, java.lang.String sValue) Sets the attribute sKey of the current node
void	setCurrentNode(java.util.prefs.Preferences oNode) Sets the current preferences node and notifies observers if the new node is not the same as the previous current node.

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Method Detail

Instance

public static PreferencesModel Instance()

Singleton accessor

Returns:

PreferencesModel

getCurrentNode

public java.util.prefs.Preferences getCurrentNode()

Gets the current preferences node

Returns:

java.util.prefs.Preferences

setCurrentNode

public void setCurrentNode(java.util.prefs.Preferences oNode)

Sets the current preferences node and notifies observers if the new node is not the same as the previous current node.

Parameters:

oNode - new current node

setAttribute

public void setAttribute(java.lang.String sKey,
                         java.lang.String sValue)

Sets the attribute sKey of the current node

Parameters:

sKey - node key name

sValue - node key value

removeAttribute

public void removeAttribute(java.lang.String sKey)

Removes the attribute sKey of the current node

Parameters:

sKey - node key to remove

renameAttribute

public void renameAttribute(java.lang.String sOldKey,
                            java.lang.String sNewKey)

Renames the attribute sOldKey of the current node

Parameters:

sOldKey - node key old name

sNewKey - node key new name

newNode

public java.util.prefs.Preferences newNode(java.lang.String sNodeName)

Creates a new node as a child of the current node

Parameters:

sNodeName - new node name

Returns:

java.util.prefs.Preferences the new node

deleteNode

public java.util.prefs.Preferences deleteNode()

Deletes the current node and its children

Returns:

java.util.prefs.Preferences the parent of the deleted node

childAdded

public void childAdded(java.util.prefs.NodeChangeEvent evt)

Specified by:

childAdded in interface java.util.prefs.NodeChangeListener

See Also:

NodeChangeListener.childAdded(java.util.prefs.NodeChangeEvent)

childRemoved

public void childRemoved(java.util.prefs.NodeChangeEvent evt)

Specified by:

childRemoved in interface java.util.prefs.NodeChangeListener

See Also:

NodeChangeListener.childRemoved(java.util.prefs.NodeChangeEvent)

preferenceChange

public void preferenceChange(java.util.prefs.PreferenceChangeEvent evt)

Specified by:

preferenceChange in interface java.util.prefs.PreferenceChangeListener

See Also:

PreferenceChangeListener.preferenceChange(java.util.prefs.PreferenceChangeEvent)