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<Creating custom sorting types for Apache Cassandra ⁄ >




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In part three of Installing and using Apache Cassandra With Java we already talked about sorting and the various sorting types that are available by default. this time we are going to have a look as to what is needed to create your very own sorting type. In this example we will create a sorting type which will sort the data as if they are dates. Now to clarify already, i use the european notation style (dd-MM-yyyy) so don't get confused by that.

Also what is very important to know, the sorting types are used when you are storing data (i mentioned this in part three), however, the sorting types are also used when you are using the get_slice method of the Cassandra Client.

As i mentioned in part three Cassandra provides us with an abstract class org.apache.cassandra.db.marshal.AbstractType which we must extend to define our sorting behavior. When we extend this class we need to provide two methods, first is the getString(byte[] bytes) method, this method is actually not that important, it is used by Cassandra so that it can display logging information with the actual data at hand. Another method that needs to be implemented is the compare(byte[] value1, byte[] value2) method of the Comparator interface.



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