Github user okram commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/310#issuecomment-218266032
CHANGELOG
```
* `GraphFilter` helper methods are now more intelligent when determining
edge direction/label legality.
* Added `GraphFilterStrategy` to automatically construct `GraphFilters` via
traversal introspection.
```
UPDATE
```
GraphFilter and GraphFilterStrategy
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
`GraphFilter` has been significantly advanced where the determination of an
edge direction/label legality is more stringent. Along with this,
`GraphFilter.getLegallyPositiveEdgeLabels()` has been added as a helper method
to make it easier for providers to know the space of labels being accessed by
the traversal.
Note that `GraphFilterStrategy` is a default `TraversalStrategy` registered
with `GraphComputer.` If `GraphFilter` is expensive for the underlying
`GraphComputer` implementation, it can be deactivated accordingly as is done
for `TinkerGraphComputer`.
[source,java]
----
static {
TraversalStrategies.GlobalCache.registerStrategies(TinkerGraphComputer.class,
TraversalStrategies.GlobalCache.getStrategies(GraphComputer.class).clone().removeStrategies(GraphFilterStrategy.class));
}
----
```
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