GeServer CQL query using Java

I have two layers of a shape file (the shape file contains geographic information of a specific area) in GeoServer, I can filter a specific location like california with this CQL query:

(INTERSECTS(col1,querySingle('layerName','col1','filterParam=value'))) 

      

        
        
        
      

    

in the GeoServer user interface. I want to do the same using Java / REST API. Any help / suggestion would be much appreciated.