Time for action – injecting preferences

The top-level preferences store can be injected into the object by using standard dependency injection techniques, using the IEclipsePreferences interface. The underlying nodes can also be injected by using an @Preferences annotation, specifying the node path of interest.

1. Add the org.eclipse.e4.core.di.extensions package to the manifest of the com.packtpub.e4.clock.ui project, which contains the @Preferences annotation.

2. In the TimeZoneTreeView class, add a new field of type IEclipsePreferences called preferences. Annotate it with @Inject and @Preferences(nodePath = "com.packtpub.e4.clock.ui"):

   @Preference(nodePath = "com.packtpub.e4.clock.ui")
   @Inject
   IEclipsePreferences preferences;

   Note

   The IEclipsePreferences interface is a subtype of the Preferences interface used in the previous section. However, the @Preference annotation requires that the IEclipsePreferences type be used here; otherwise a runtime exception will occur.

3. In the create method, print a...