@Override
		public Path resolvePath(Message<?> partitionKey) {
			return new Path(methods.getValue(expression, partitionKey, String.class));
		}
A {@link PartitionResolver} which uses an {@link Expression} together with
{@link MessageExpressionMethods} to evaluate new {@link Path}s.
spring-xd-hadoop/src/main/java/org/springframework/xd/integration/hadoop/partition/MessagePartitionStrategy.java