Java library for building Streaming Expressions

[Pratik Patel]

Hello Everyone,

Is there any java library for building Streaming Expressions? Currently, I
am using solr's java client and building Streaming Expressions as follows.

StreamFactory factory = new StreamFactory().withCollectionZkHost( collName,
zkHost )
                    .withFunctionName("gatherNodes",
GatherNodesStream.class)
                    .withFunctionName("search", CloudSolrStream.class)
                    .withFunctionName("count", CountMetric.class)
                    .withFunctionName("having", HavingStream.class)
                    .withFunctionName("gt", GreaterThanOperation.class)
                    .withFunctionName("eq", EqualsOperation.class);
            HavingStream cs = (HavingStream) factory.constructStream(
<streaming_expression_str> );

In this approach, I still have to build  streaming_expression_str in code.
Is there any better approach for this or is there any java library to do
this? My search for it didn't yield anything so I was wondering if anyone
here has an idea.

Thanks,
Pratik