Access Aggregator From Custom Vertex Output Format

[Puneet Agarwal]

I needed to access the aggregator from my custom vertex output format class.
Following is how I did this, feel like sharing with the community.
getAggregatedValue does not work from the custome vertex output class, so I 
have overridden getValue method in the vertex class. In the getValue method I 
access the aggregator. Now I am able to print only a selected few vertexes in 
the output file based on what is present in the aggregated value.
RegardsPuneet