@Override
    public void writeGraph(final String file) throws IOException {
        throw new UnsupportedOperationException("GraphBinaryIo is only used to support IoRegistry configuration - it's methods are not implemented");
    }
This is a dummy implementation of {@link Io} which is only used in the context of helping to configure a
GraphBinary {@code MessageSerializer} with an {@link IoRegistry}. It's methods are not implemented.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/binary/GraphBinaryIo.java