Package org.eclipse.core.runtime.preferences

Interface IEclipsePreferences

All Superinterfaces:

Preferences

All Known Subinterfaces:

IExportedPreferences

public interface IEclipsePreferences
extends Preferences

This interface describes Eclipse extensions to the preference story. It provides means for both preference and node change listeners.

Clients may implement this interface.

Since:

3.0

See Also:

• Preferences

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	IEclipsePreferences.INodeChangeListener	A listener to be used to receive preference node change events.
static interface	IEclipsePreferences.IPreferenceChangeListener	A listener used to receive changes to preference values in the preference store.
static final class	IEclipsePreferences.NodeChangeEvent	An event object which describes the details of a change in the preference node hierarchy.
static final class	IEclipsePreferences.PreferenceChangeEvent	An event object describing the details of a change to a preference in the preference store.

Method Summary

Modifier and Type	Method	Description
void	accept(IPreferenceNodeVisitor visitor)	Accepts the given visitor.
void	addNodeChangeListener(IEclipsePreferences.INodeChangeListener listener)	Register the given listener for changes to this node.
void	addPreferenceChangeListener(IEclipsePreferences.IPreferenceChangeListener listener)	Register the given listener for notification of preference changes to this node.
Preferences	node(String path)	Return the preferences node with the given path.
void	removeNode()	Remove this node from the preference hierarchy.
void	removeNodeChangeListener(IEclipsePreferences.INodeChangeListener listener)	De-register the given listener from receiving event change notifications for this node.
void	removePreferenceChangeListener(IEclipsePreferences.IPreferenceChangeListener listener)	De-register the given listener from receiving notification of preference changes to this node.

Methods inherited from interface org.osgi.service.prefs.Preferences

absolutePath, childrenNames, clear, flush, get, getBoolean, getByteArray, getDouble, getFloat, getInt, getLong, keys, name, nodeExists, parent, put, putBoolean, putByteArray, putDouble, putFloat, putInt, putLong, remove, sync

Method Details

addNodeChangeListener

void addNodeChangeListener(IEclipsePreferences.INodeChangeListener listener)

Register the given listener for changes to this node. Duplicate calls to this method with the same listener will have no effect. The given listener argument must not be null.

Parameters:

listener - the node change listener to add

Throws:

IllegalStateException - if this node or an ancestor has been removed

See Also:

• removeNodeChangeListener(IEclipsePreferences.INodeChangeListener)
• IEclipsePreferences.INodeChangeListener

removeNodeChangeListener

void removeNodeChangeListener(IEclipsePreferences.INodeChangeListener listener)

De-register the given listener from receiving event change notifications for this node. Calling this method with a listener which is not registered has no effect. The given listener argument must not be null.

Parameters:

listener - the node change listener to remove

Throws:

IllegalStateException - if this node or an ancestor has been removed

See Also:

• addNodeChangeListener(IEclipsePreferences.INodeChangeListener)
• IEclipsePreferences.INodeChangeListener

addPreferenceChangeListener

void addPreferenceChangeListener(IEclipsePreferences.IPreferenceChangeListener listener)

Register the given listener for notification of preference changes to this node. Calling this method multiple times with the same listener has no effect. The given listener argument must not be null.

Parameters:

listener - the preference change listener to register

Throws:

IllegalStateException - if this node or an ancestor has been removed

See Also:

• removePreferenceChangeListener(IEclipsePreferences.IPreferenceChangeListener)
• IEclipsePreferences.IPreferenceChangeListener

removePreferenceChangeListener

void removePreferenceChangeListener(IEclipsePreferences.IPreferenceChangeListener listener)

De-register the given listener from receiving notification of preference changes to this node. Calling this method multiple times with the same listener has no effect. The given listener argument must not be null.

Parameters:

listener - the preference change listener to remove

Throws:

IllegalStateException - if this node or an ancestor has been removed

See Also:

• addPreferenceChangeListener(IEclipsePreferences.IPreferenceChangeListener)
• IEclipsePreferences.IPreferenceChangeListener

removeNode

void removeNode()
         throws BackingStoreException

Remove this node from the preference hierarchy. If this node is the scope root, then do not remove this node, only remove this node's children.

Functionally equivalent to calling Preferences.removeNode(). See the spec of Preferences.removeNode() for more details.

Implementors must send the appropriate IEclipsePreferences.NodeChangeEvent to listeners who are registered on this node's parent.

When this node is removed, its associated preference and node change listeners should be removed as well.

Specified by:

removeNode in interface Preferences

Throws:

BackingStoreException - if there was a problem removing this node

See Also:

• Preferences.removeNode()
• IEclipsePreferences.NodeChangeEvent

node

Preferences node(String path)

Return the preferences node with the given path. The given path must not be null.

See the spec of Preferences.node(String) for more details.

Note that if the node does not yet exist and is created, then the appropriate IEclipsePreferences.NodeChangeEvent must be sent to listeners who are registered at this node.

Specified by:

node in interface Preferences

Parameters:

path - the path of the node

Returns:

the node

See Also:

• Preferences.node(String)
• IEclipsePreferences.NodeChangeEvent

accept

void accept(IPreferenceNodeVisitor visitor)
     throws BackingStoreException

Accepts the given visitor. The visitor's visit method is called with this node. If the visitor returns true, this method visits this node's children.

Parameters:

visitor - the visitor

Throws:

BackingStoreException - if this operation cannot be completed due to a failure in the backing store, or inability to communicate with it.

See Also:

• IPreferenceNodeVisitor.visit(IEclipsePreferences)