Consider the Law of Demeter here and push the retrieval of these extents down into the `Job` class.

```
def temporalExtent = job.getTemporalExtent()
def spatialExtent = job.getSpatialExtent()
```

Actually with Groovy once the `get` methods are written you could just reference them as;

```
def temporalExtent = job.temporalExtent
def spatialExtent = job.spatialExtent
```