Package org.eclipse.core.runtime.dynamichelpers

Class ExtensionTracker

java.lang.Object
org.eclipse.core.runtime.dynamichelpers.ExtensionTracker
All Implemented Interfaces:
EventListener, IExtensionTracker, IRegistryChangeListener
public class ExtensionTracker extends Object implements IExtensionTracker, IRegistryChangeListener
Implementation of the IExtensionTracker.

This class can be used without OSGi running.

Since:
3.1
See Also:

  • Constructor Details

    • ExtensionTracker

      public ExtensionTracker()
      Construct a new instance of the extension tracker.

    • ExtensionTracker

      public ExtensionTracker(IExtensionRegistry theRegistry)
      Construct a new instance of the extension tracker using the given registry containing tracked extensions and extension points.
      Parameters:
      theRegistry - the extension registry to track
      Since:
      org.eclipse.equinox.registry 3.2

  • Method Details

    • registerHandler

      public void registerHandler(IExtensionChangeHandler handler, IFilter filter)
      Description copied from interface: IExtensionTracker
      Register an extension change handler with this tracker using the given filter.
      Specified by:
      registerHandler in interface IExtensionTracker
      Parameters:
      handler - the handler to be registered
      filter - the filter to use to choose interesting changes

    • unregisterHandler

      public void unregisterHandler(IExtensionChangeHandler handler)
      Description copied from interface: IExtensionTracker
      Unregister the given extension change handler previously registered with this tracker.
      Specified by:
      unregisterHandler in interface IExtensionTracker
      Parameters:
      handler - the handler to be unregistered

    • registerObject

      public void registerObject(IExtension element, Object object, int referenceType)
      Description copied from interface: IExtensionTracker
      Create an association between the given extension and the given object. The referenceType indicates how strongly the object is being kept in memory. There is 3 possible values: IExtensionTracker.REF_STRONG, IExtensionTracker.REF_SOFT, IExtensionTracker.REF_WEAK.
      Specified by:
      registerObject in interface IExtensionTracker
      Parameters:
      element - the extension
      object - the object to associate with the extension
      referenceType - one of REF_STRONG, REF_SOFT, REF_WEAK
      See Also:

    • registryChanged

      public void registryChanged(IRegistryChangeEvent event)
      Implementation of IRegistryChangeListener interface.

      This method must not be called by clients.

      Specified by:
      registryChanged in interface IRegistryChangeListener
      Parameters:
      event - the registry change event
      See Also:

    • applyAdd

      protected void applyAdd(IExtensionChangeHandler handler, IExtension extension)

    • applyRemove

      protected void applyRemove(IExtensionChangeHandler handler, IExtension removedExtension, Object[] removedObjects)

    • getObjects

      public Object[] getObjects(IExtension element)
      Description copied from interface: IExtensionTracker
      Return all the objects that have been associated with the given extension. All objects registered strongly will be return unless they have been unregistered. The objects registered softly or weakly may not be returned if they have been garbage collected. Return an empty array if no associations exist.
      Specified by:
      getObjects in interface IExtensionTracker
      Parameters:
      element - the extension for which the object must be returned
      Returns:
      the array of associated objects

    • close

      public void close()
      Description copied from interface: IExtensionTracker
      Close the tracker. All registered objects are freed and all handlers are being automatically removed.
      Specified by:
      close in interface IExtensionTracker

    • unregisterObject

      public void unregisterObject(IExtension extension, Object object)
      Description copied from interface: IExtensionTracker
      Remove an association between the given extension and the given object.
      Specified by:
      unregisterObject in interface IExtensionTracker
      Parameters:
      extension - the extension under which the object has been registered
      object - the object to unregister

    • unregisterObject

      public Object[] unregisterObject(IExtension extension)
      Description copied from interface: IExtensionTracker
      Remove all the objects associated with the given extension. Return the removed objects.
      Specified by:
      unregisterObject in interface IExtensionTracker
      Parameters:
      extension - the extension for which the objects are removed
      Returns:
      the objects that were associated with the extension

    • createExtensionPointFilter

      public static IFilter createExtensionPointFilter(IExtensionPoint xpt)
      Return an instance of filter matching all changes for the given extension point.
      Parameters:
      xpt - the extension point
      Returns:
      a filter

    • createExtensionPointFilter

      public static IFilter createExtensionPointFilter(IExtensionPoint[] xpts)
      Return an instance of filter matching all changes for the given extension points.
      Parameters:
      xpts - the extension points used to filter
      Returns:
      a filter

    • createNamespaceFilter

      public static IFilter createNamespaceFilter(String id)
      Return an instance of filter matching all changes from a given plugin.
      Parameters:
      id - the plugin id
      Returns:
      a filter