public class SynchronizationStateTester
A state change tester is used by logical models to communicate the
synchronization state of their logical model elements to
the lightweight label decorator of a team provider.
There are two different types of elements being decorated: those
that have a one-to-one mapping to a resource and those that do not.
Those that do should adapt to their corresponding resource. Doing
so will ensure that label updates occur when the state of that
resource changes (i.e. the team provider will generate label updates
for those resources and the model can translate them to appropriate
label updates of their model elements).
For those elements that do not have a one-to-one mapping to resources,
the model must do extra work. The purpose of this class is to allow
the model to decide when a label update for a logical model element is
required and to communicate the dirty state of their logical model
elements to the team decorator.
Model providers need to re-evaluate the state of a
model element whenever a change in the resources occurs by listening
to both resource deltas and change events from the team state provider
Decoration enablement changes and decoration configuration changes
are handled by the
A call to this method will result in label changes to all elements.
isDecorationEnabled(Object) API on this class can
be used to determine if an element will receive team decorations.
If decoration is disabled. team state changes on the element can
Clients may subclass this class.
Methods inherited from class java.lang.
public static final
- Constant that is used as the property key on an
IDecorationContext. Model based views can assign their state
test to this property in the decoration context. If a context passed to a
team decorator has this property, the associated state tester will be
used by the decorator to determine the team state of the elements being
Constant Field Values
- Create a synchronization state tester.
public boolean isStateDecorationEnabled()
- Return whether state decoration is enabled for the context
to which this tester is associated. If
is returned, a team decorator will use the state methods provided
on this class to calculate the synchronization state of model
elements for the purpose of decoration. If
is returned, a team decorator will not decorate the elements with any
synchronization related decorations. Subclasses will want to disable
state decoration if state decoration is being provided another way
(e.g. by a
SynchronizationLabelProvider). By default,
trueis returned. Subclasses may override.
- whether state decoration is enabled
public boolean isDecorationEnabled(
- Return whether decoration is enabled for the given model element in the
context to which this tester is associated. By default, the value
isStateDecorationEnabled() is used but subclasses
may override to disable decoration of particular elements.
A team decorator should call this method before decorating a model
element. If the method returns
true, no team state
decorations should be applied to the model element. Otherwise, the
getState(Object, int, IProgressMonitor) should be consulted in
order to determine what state to decorate.
element - the model element
- whether decoration is enabled for the given model element
public int getState(
- Return the synchronization state of the given element. Only the portion
of the synchronization state covered by
returned. By default, this method calls
Subscriber.getState(ResourceMapping, int, IProgressMonitor).
A team decorator will use this method to determine how to decorate the
provided element. The
ITeamStateProvider.getDecoratedStateMask(Object) returns the
state that the corresponding team decorator is capable of decorating but
the decorator may be configured to decorate only a portion of that state.
When the team decorator invokes this method, it will pass the stateMask that
it is currently configured to show. If a mask of zero is provided, this indicates
that the team decorator is not configured to decorate the synchronization state
of model elements.
Subclasses may want to override this method in the following cases:
- The subclass wishes to fire appropriate label change events when the
decorated state of a model element changes. In this case the subclass
can override this method to record the stateMask and returned state. It can
use this recorded information to determine whether local changes or subscriber changes
result in a change in the decorated state of the model element.
- The subclasses wishes to provide a more accurate change description for a model
element that represents only a portion of the file. In this case, the subclass can
use the remote file contents available from the provider to determine the proper
state for the element.
element - the model element
stateMask - the mask that identifies which state flags are desired if
monitor - a progress monitor
- the synchronization state of the given element
- Return a team state provider that delegates to the appropriate team
- a team state provider that delegates to the appropriate team
public void elementDecorated(
- A callback to the tester made from the team decorator to notify the
tester that the given element has been decorated with the given state.
The purpose of the callback is to allow the owner of the tester to
cache the decorated state in order to detect whether a future state
change requires a label update for the element.
element - the element that was decorated
description - a description of the decorated state of the element
Guidelines for using Eclipse APIs.
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