Eclipse Platform
Release 3.7

org.eclipse.core.runtime.preferences
Class DefaultScope

java.lang.Object
  extended by org.eclipse.core.internal.preferences.AbstractScope
      extended by org.eclipse.core.runtime.preferences.DefaultScope
All Implemented Interfaces:
IScopeContext

public final class DefaultScope
extends org.eclipse.core.internal.preferences.AbstractScope

Object representing the default scope in the Eclipse preferences hierarchy. Can be used as a context for searching for preference values (in the IPreferencesService APIs) or for determining the correct preference node to set values in the store.

Default preferences are not persisted to disk.

The path for preferences defined in the default scope hierarchy is as follows: /default/<qualifier>

Note about product preference customization: Clients who define their own org.eclipse.core.runtime.IProduct are able to specify a product key of "preferenceCustomization". (defined as a constant in org.eclipse.ui.branding.IProductConstants) Its value is either a URL or a file-system path to a file whose contents are used to customize default preferences.

This class is not intended to be subclassed. This class may be instantiated.

Since:
3.0

Field Summary
static IScopeContext INSTANCE
          Singleton instance of a Default Scope object.
static String SCOPE
          String constant (value of "default") used for the scope name for the default preference scope.
 
Constructor Summary
DefaultScope()
          Deprecated. use DefaultScope.INSTANCE instead
 
Method Summary
 IPath getLocation()
          Return a path to a location in the file-system where clients are able to write files that will have the same sharing/scope properties as preferences defined in this scope.
 String getName()
          Return the name of the scope that this context is associated with.
 IEclipsePreferences getNode(String qualifier)
          Return the preferences node that contains the preferences for the given qualifier or null if the node cannot be determined.
 
Methods inherited from class org.eclipse.core.internal.preferences.AbstractScope
equals, hashCode
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

SCOPE

public static final String SCOPE
String constant (value of "default") used for the scope name for the default preference scope.

See Also:
Constant Field Values

INSTANCE

public static final IScopeContext INSTANCE
Singleton instance of a Default Scope object. Typical usage is: DefaultScope.INSTANCE.getNode(...);

Since:
3.4
Constructor Detail

DefaultScope

public DefaultScope()
Deprecated. use DefaultScope.INSTANCE instead

Create and return a new default scope instance.

Method Detail

getName

public String getName()
Description copied from interface: IScopeContext
Return the name of the scope that this context is associated with. Must not be null.

Specified by:
getName in interface IScopeContext
Specified by:
getName in class org.eclipse.core.internal.preferences.AbstractScope
Returns:
the name of the scope

getNode

public IEclipsePreferences getNode(String qualifier)
Description copied from interface: IScopeContext
Return the preferences node that contains the preferences for the given qualifier or null if the node cannot be determined. The given qualifier must not be null but may be a path to a sub-node within the scope.

An example of a qualifier in Eclipse 2.1 would be the plug-in identifier that the preference is associated with (e.g. the "org.eclipse.core.resources" plug-in defines the "description.autobuild" preference).

This method can be used to determine the appropriate preferences node to aid in setting key/value pairs. For instance: new InstanceScope().getNode("org.eclipse.core.resources"); returns the preference node in the instance scope where the preferences for "org.eclipse.core.resources" are stored.

Specified by:
getNode in interface IScopeContext
Overrides:
getNode in class org.eclipse.core.internal.preferences.AbstractScope
Parameters:
qualifier - a qualifier for the preference name
Returns:
the node containing the plug-in preferences or null
See Also:
IPreferencesService

getLocation

public IPath getLocation()
Description copied from interface: IScopeContext
Return a path to a location in the file-system where clients are able to write files that will have the same sharing/scope properties as preferences defined in this scope.

Implementors may return null if the location is not known, is unavailable, or is not applicable to this scope.

Specified by:
getLocation in interface IScopeContext
Specified by:
getLocation in class org.eclipse.core.internal.preferences.AbstractScope
Returns:
a writable location in the file system or null

Eclipse Platform
Release 3.7

Guidelines for using Eclipse APIs.

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