RFWS Considerations in Java

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Synchronize with the Outline view
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User Interface Guideline #24 is a best practice that states: Notification about location between an Editor and the Outline view should be two-way Context menus should be available in the Outline view as appropriate Select an item in the Outline view and show that it selects the corresponding item in the editor Next, select an item in the editor and show that it selects the corresponding item in the Outline view
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Synchronize with external changes
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User Interface Guideline #25 is a requirement that states: If modifications to a resource are made outside of the workbench, users should be prompted to either override the changes made outside of the workbench, or back out of the Save operation when the Save action is invoked in the editor Open your editor on a file and make a change Next, modify the file outside of Eclipse Finally, switch back to Eclipse and attempt to save the
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TT 8 Editors
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file Show that you are prompted to override the external changes or cancel the save operation If you implement your editor using the editor framework described in this chapter, then the framework automatically enforces this guideline
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86 SUMMARY
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In this chapter, we went into detail about how to create new editors for editing and browsing resources in the workbench We showed how to set up a multi-page editor, handle the editor lifecycle and create various editor actions
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C H A P T E R
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Resource change tracking
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The Eclipse system generates resource change events indicating, for
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example, the files and folders that have been added, modified, and removed during the course of an operation Interested objects can subscribe to these events and take whatever action is necessary to keep themselves synchronized with Eclipse To demonstrate resource change tracking, we shall modify our Favorites view (see 7) so that whenever a resource is deleted, we can remove the corresponding element from the Favorites view
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TT 9 Resource change tracking
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IRESOURCECHANGELISTENER
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Eclipse uses the orgeclipsecoreresourcesIResourceChangeListener interface to notify registered listeners when a resource has changed The FavoritesManager
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(see Section 723) needs keep its list of favorite items synchro-
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nized with Eclipse This is done by implementing the
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orgeclipsecoreresourcesIResourceChangeListener
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interface and registershutdown()
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ing for resource change events In addition, the FavoritesPlugin method must be modified to call the new FavoritesManager
shutdown()
method so that the manager is no longer notified of resource changes once the plug-in has been shutdown Now, whenever a resource change occurs, Eclipse will call the resourceChanged( ) method
public class FavoritesManager implements IResourceChangeListener { private FavoritesManager() { ResourcesPlugin getWorkspace() addResourceChangeListener( this, IResourceChangeEventPOST_CHANGE); } public static void shutdown() { if (manager != null) { ResourcesPlugin
IResourceChangeListener
getWorkspace() removeResourceChangeListener( manager); manager = null; } } public void resourceChanged(IResourceChangeEvent e) { // process events here } existing code from Section 723 here }
911 IResourceChangeEvent The FavoritesManager is only interested in changes that have already occurred and therefore uses the IResourceChangeEventPOST_CHANGE constant when subscribing to change events Eclipse provides several IResourceChangeEvent
constants that can be used in combination to specify when the inter-
ested object should be notified of resource changes Below is the list of valid constants as they appear in the IResourceChangeEvent Javadoc
POST_CHANGE
- After-the-fact report of creations, deletions, and
modifications to one or more resources expressed as a hierarchical resource delta as returned by getDelta()
PRE_CLOSE
- Before-the-fact report of the impending closure of
TT 9 Resource change tracking
a single project as returned by getResource()
PRE_DELETE
- Before-the-fact report of the impending deletion
of a single project as returned by getResource()
PRE_AUTO_BUILD
- Before-the-fact report of builder activity (see
Section 141)
POST_AUTO_BUILD
- After-the-fact report of builder activity (see
Section 141)
The IResourceChangeEvent class also defines several methods that can be used to query its state:
findMarkerDeltas(String, boolean)
- Returns all marker deltas
of the specified type that are associated with resource deltas for this event
getDelta()
- Returns a resource delta, rooted at the workspace,
describing the set of changes that happened to resources in the workspace
getResource()
- Returns the resource in question
IResourceChangeListener
getSource()
- Returns an object identifying the source of this
event
getType()
- Returns the type of event being reported
912 IResourceDelta Each individual change is encoded as an instance of a resource delta that is represented by the IResourceDelta interface Eclipse provides several different constants that can be used in combination to identify the resource deltas handled by the system Below is the list of valid constants as they appear in the IResourceDelta Javadoc