Package org.eclipse.core.resources

Interface IResourceChangeEvent

  • public interface IResourceChangeEvent
    Resource change events describe changes to resources.

    There are currently five different types of resource change events:

    • Before-the-fact batch reports of arbitrary creations, deletions and modifications to one or more resources expressed as a hierarchical resource delta. Event type is PRE_BUILD, and getDelta returns the hierarchical delta rooted at the workspace root. The getBuildKind method returns the kind of build that is about to occur, and the getSource method returns the scope of the build (either the workspace or a single project). These events are broadcast to interested parties immediately before each build operation. If autobuilding is not enabled, these events still occur at times when autobuild would have occurred. The workspace is open for change during notification of these events. The delta reported in this event cycle is identical across all listeners registered for this type of event. Resource changes attempted during a PRE_BUILD callback must be done in the thread doing the notification.
    • After-the-fact batch reports of arbitrary creations, deletions and modifications to one or more resources expressed as a hierarchical resource delta. Event type is POST_BUILD, and getDelta returns the hierarchical delta rooted at the workspace root. The getBuildKind method returns the kind of build that occurred, and the getSource method returns the scope of the build (either the workspace or a single project). These events are broadcast to interested parties at the end of every build operation. If autobuilding is not enabled, these events still occur at times when autobuild would have occurred. The workspace is open for change during notification of these events. The delta reported in this event cycle is identical across all listeners registered for this type of event. Resource changes attempted during a POST_BUILD callback must be done in the thread doing the notification.
    • After-the-fact batch reports of arbitrary creations, deletions and modifications to one or more resources expressed as a hierarchical resource delta. Event type is POST_CHANGE, and getDelta returns the hierarchical delta. The resource delta is rooted at the workspace root. These events are broadcast to interested parties after a set of resource changes and happen whether or not autobuilding is enabled. The workspace is closed for change during notification of these events. The delta reported in this event cycle is identical across all listeners registered for this type of event.
    • Before-the-fact reports of the impending closure of a single project. Event type is PRE_CLOSE, and getResource returns the project being closed. The workspace is closed for change during notification of these events.
    • Before-the-fact reports of the impending deletion of a single project. Event type is PRE_DELETE, and getResource returns the project being deleted. The workspace is closed for change during notification of these events.
    • Before-the-fact reports of the impending refresh of a single project or the workspace. Event type is PRE_REFRESH and the getSource method returns the scope of the refresh (either the workspace or a single project). If the event is fired by a project refresh the getResource method returns the project being refreshed. The workspace is closed for changes during notification of these events.

    In order to handle additional event types that may be introduced in future releases of the platform, clients should do not write code that presumes the set of event types is closed.

    Restriction:
    This interface is not intended to be implemented by clients.
    Restriction:
    This interface is not intended to be extended by clients.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int POST_AUTO_BUILD
      Deprecated.
      This event type has been renamed to POST_BUILD
      static int POST_BUILD
      Event type constant (bit mask) indicating an after-the-fact report of a build.
      static int POST_CHANGE
      Event type constant (bit mask) indicating an after-the-fact report of creations, deletions, and modifications to one or more resources expressed as a hierarchical resource delta as returned by getDelta.
      static int PRE_AUTO_BUILD
      Deprecated.
      This event type has been renamed to PRE_BUILD
      static int PRE_BUILD
      Event type constant (bit mask) indicating a before-the-fact report of a build.
      static int PRE_CLOSE
      Event type constant (bit mask) indicating a before-the-fact report of the impending closure of a single project as returned by getResource.
      static int PRE_DELETE
      Event type constant (bit mask) indicating a before-the-fact report of the impending deletion of a single project as returned by getResource.
      static int PRE_REFRESH
      Event type constant (bit mask) indicating a before-the-fact report of refreshing the workspace or a project.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      IMarkerDelta[] findMarkerDeltas​(String type, boolean includeSubtypes)
      Returns all marker deltas of the specified type that are associated with resource deltas for this event.
      int getBuildKind()
      Returns the kind of build that caused this event, or 0 if not applicable to this type of event.
      IResourceDelta getDelta()
      Returns a resource delta, rooted at the workspace, describing the set of changes that happened to resources in the workspace.
      IResource getResource()
      Returns the resource in question or null if not applicable to this type of event.
      Object getSource()
      Returns an object identifying the source of this event.
      int getType()
      Returns the type of event being reported.

    • Field Detail

      • POST_CHANGE

        static final int POST_CHANGE
        Event type constant (bit mask) indicating an after-the-fact report of creations, deletions, and modifications to one or more resources expressed as a hierarchical resource delta as returned by getDelta. See class comments for further details.
        See Also:
        getType(), getDelta(), Constant Field Values

      • PRE_CLOSE

        static final int PRE_CLOSE
        Event type constant (bit mask) indicating a before-the-fact report of the impending closure of a single project as returned by getResource. See class comments for further details.
        See Also:
        getType(), getResource(), Constant Field Values

      • PRE_DELETE

        static final int PRE_DELETE
        Event type constant (bit mask) indicating a before-the-fact report of the impending deletion of a single project as returned by getResource. See class comments for further details.
        See Also:
        getType(), getResource(), Constant Field Values

      • PRE_BUILD

        static final int PRE_BUILD
        Event type constant (bit mask) indicating a before-the-fact report of a build. The event contains a hierarchical resource delta as returned by getDelta. See class comments for further details.
        Since:
        3.0
        See Also:
        getBuildKind(), getSource(), Constant Field Values

      • POST_BUILD

        static final int POST_BUILD
        Event type constant (bit mask) indicating an after-the-fact report of a build. The event contains a hierarchical resource delta as returned by getDelta. See class comments for further details.
        Since:
        3.0
        See Also:
        getBuildKind(), getSource(), Constant Field Values

      • PRE_REFRESH

        static final int PRE_REFRESH
        Event type constant (bit mask) indicating a before-the-fact report of refreshing the workspace or a project. See class comments for further details.
        Since:
        3.4
        See Also:
        getType(), getSource(), getResource(), Constant Field Values

    • Method Detail

      • findMarkerDeltas

        IMarkerDelta[] findMarkerDeltas​(String type,
                                boolean includeSubtypes)
        Returns all marker deltas of the specified type that are associated with resource deltas for this event. If includeSubtypes is false, only marker deltas whose type exactly matches the given type are returned. Returns an empty array if there are no matching marker deltas.

        Calling this method is equivalent to walking the entire resource delta for this event, and collecting all marker deltas of a given type. The speed of this method will be proportional to the number of changed markers, regardless of the size of the resource delta tree.

        Parameters:
        type - the type of marker to consider, or null to indicate all types
        includeSubtypes - whether or not to consider sub-types of the given type
        Returns:
        an array of marker deltas
        Since:
        2.0

      • getDelta

        IResourceDelta getDelta()
        Returns a resource delta, rooted at the workspace, describing the set of changes that happened to resources in the workspace. Returns null if not applicable to this type of event.
        Returns:
        the resource delta, or null if not applicable

      • getResource

        IResource getResource()
        Returns the resource in question or null if not applicable to this type of event.

        If the event is of type PRE_CLOSE, PRE_DELETE, or PRE_REFRESH, then the resource will be the affected project. Otherwise the resource will be null.

        Returns:
        the resource, or null if not applicable

      • getSource

        Object getSource()
        Returns an object identifying the source of this event.

        If the event is a PRE_BUILD, POST_BUILD, or PRE_REFRESH then this will be the scope of the build (either the IWorkspace or a single IProject).

        Returns:
        an object identifying the source of this event
        See Also:
        EventObject