@Override
    public int nextConditionalValue(final Random random, final int otherValue) {
        return otherValue;
    }
CopyDistribution returns the conditional value.
<p/>
Hence, this class can be used as the in-degree distribution to ensure that
the in-degree of a vertex is equal to the out-degree.

@author Matthias Broecheler (me@matthiasb.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/algorithm/generator/CopyDistribution.java