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## org.eclipse.team.core.variants
Class ResourceVariantTreeSubscriber

    java.lang.Object
      org.eclipse.team.core.subscribers.Subscriber
          org.eclipse.team.core.variants.ResourceVariantTreeSubscriber

Direct Known Subclasses:
  ThreeWaySubscriber

public abstract class ResourceVariantTreeSubscriber
extends Subscriber

A specialization of Subscriber that uses `IResourceVariantTree` objects to manage the base (for three-way) and remote trees. Refreshing and obtaining the subscriber members and resource variants is delegated to the resource variant trees.

Since:
  3.0

Constructor Summary
`ResourceVariantTreeSubscriber()`

Method Summary
`protected abstract IResourceVariantTree` | `getBaseTree()` Return the base resource variant tree.
`protected abstract IResourceVariantTree` | `getRemoteTree()` Return the remote resource variant tree.
`SyncInfo` | `getSyncInfo(IResource resource)` Returns synchronization info for the given resource, or `null` if there is no synchronization info because the subscriber does not apply to this resource.
`protected SyncInfo` | `getSyncInfo(IResource local, IResourceVariant base, IResourceVariant remote)` Method that creates an instance of SyncInfo for the provided local, base and remote resource variants.
`IResource[]` | `members(IResource resource)` Returns all non-transient member resources of the given resource.
`void` | `refresh(IResource[] resources, int depth, IProgressMonitor monitor)` Refreshes the resource hierarchy from the given resources and their children (to the specified depth) from the corresponding resources in the remote location.

Methods inherited from class org.eclipse.team.core.subscribers.Subscriber
`addListener, collectOutOfSync, fireTeamResourceChange, getName, getResourceComparator, isSupervised, removeListener, roots`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ResourceVariantTreeSubscriber

    public ResourceVariantTreeSubscriber()

Method Detail

### getSyncInfo

    public SyncInfo getSyncInfo(IResource resource)
                         throws TeamException

  Description copied from class: `Subscriber`
  Returns synchronization info for the given resource, or `null` if there is no synchronization info because the subscriber does not apply to this resource.

  Note that sync info may be returned for non-existing or for resources which have no corresponding remote resource.

  This method will be quick. If synchronization calculation requires content from the server it must be cached when the subscriber is refreshed. A client should call refresh before calling this method to ensure that the latest information is available for computing the sync state.

  Specified by:
    `getSyncInfo` in class `Subscriber`
  Parameters:
    `resource` - the resource of interest
  Returns:
    sync info
  Throws:
    `TeamException`

### getSyncInfo

    protected SyncInfo getSyncInfo(IResource local,
                                   IResourceVariant base,
                                   IResourceVariant remote)
                            throws TeamException

  Method that creates an instance of SyncInfo for the provided local, base and remote resource variants. Can be overiden by subclasses.

  Parameters:
    `local` - the local resource
    `base` - the base resource variant or `null`
    `remote` - the remote resource variant or `null`
  Returns:
    the `SyncInfo` containing the provided resources
  Throws:
    `TeamException`

### members

    public IResource[] members(IResource resource)
                        throws TeamException

  Description copied from class: `Subscriber`
  Returns all non-transient member resources of the given resource. The result will include entries for resources that exist either in the workspace or are implicated in an incoming change. Returns an empty list if the given resource exists neither in the workspace nor in the corresponding subscriber location, or if the given resource is transient.

  This is a fast operation; the repository is not contacted.

  Specified by:
    `members` in class `Subscriber`
  Parameters:
    `resource` - the resource
  Returns:
    a list of member resources
  Throws:
    `TeamException`

### refresh

    public void refresh(IResource[] resources,
                        int depth,
                        IProgressMonitor monitor)
                 throws TeamException

  Description copied from class: `Subscriber`
  Refreshes the resource hierarchy from the given resources and their children (to the specified depth) from the corresponding resources in the remote location. Resources are ignored in the following cases:
  - if they do not exist either in the workspace or in the corresponding remote location
  - if the given resource is not supervised by this subscriber
  - if the given resource is a closed project (they are ineligible for synchronization)

  Typical synchronization operations use the statuses computed by this method as the basis for determining what to do. It is possible for the actual sync status of the resource to have changed since the current local sync status was refreshed. Operations typically skip resources with stale sync information. The chances of stale information being used can be reduced by running this method (where feasible) before doing other operations. Note that this will of course affect performance.

  The depth parameter controls whether refreshing is performed on just the given resource (depth= `DEPTH_ZERO`), the resource and its children (depth= `DEPTH_ONE`), or recursively to the resource and all its descendents (depth= `DEPTH_INFINITE`). Use depth `DEPTH_ONE`, rather than depth `DEPTH_ZERO`, to ensure that new members of a project or folder are detected.

  This method might change resources; any changes will be reported in a subsequent subscriber resource change event indicating changes to server sync status.

  This method contacts the server and is therefore long-running; progress and cancellation are provided by the given progress monitor.

  Specified by:
    `refresh` in class `Subscriber`
  Parameters:
    `resources` - the resources
    `depth` - valid values are `DEPTH_ZERO`, `DEPTH_ONE`, or `DEPTH_INFINITE`
    `monitor` - progress monitor, or `null` if progress reporting and cancellation are not desired
  Returns:
    status with code `OK` if there were no problems; otherwise a description (possibly a multi-status) consisting of low-severity warnings or informational messages.
  Throws:
    `TeamException` - if this method fails. Reasons include:
    - The server could not be contacted.

### getBaseTree

    protected abstract IResourceVariantTree getBaseTree()

  Return the base resource variant tree.

### getRemoteTree

    protected abstract IResourceVariantTree getRemoteTree()

  Return the remote resource variant tree.

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