This can be achieved using convert function[1]. [1] https://docs.wso2.com/display/CEP400/Inbuilt+Functions#InbuiltFunctions-convertconvert
On Tue, Dec 6, 2016 at 9:18 AM, Megala Uthayakumar <meg...@wso2.com> wrote: > > Hi All, > > In IOT analytics, we have a requirement of writing siddhi extension to get > the value for a particular json property when the json string and property > name are passed as parameters. The extension can be used as below, > > *json:getProperty("jsonString","property_name")* > > Since the above function is capable of returning any type > (Bool/long/string/..) as return values. Initially we tried it without > defining the return types. In that case, siddhi engine threw and exception > saying that return type of above is null and stream definitions does not > match. After that we tried to set the return type in execute method based > on the value. but seems like it is required to use the init method in > siddhi extension to set the return type. Finally what we did is to use the > third parameter which would indicate the type required for the return type > as follow, > > if we need a double > > *json.getProperty("jsonString", "latitude", 0.0d);* > > if we need a long, > > *json.getProperty(("jsonString", "timestamp", 0l);* > > Is there any better way of achieving this ? or do we have a cast function > for string, so that we can later cast the value to a desired type? > > Thanks. > > Regards, > Megala > -- > Megala Uthayakumar > > Software Engineer > Mobile : 0779967122 > -- Megala Uthayakumar Software Engineer Mobile : 0779967122
_______________________________________________ Dev mailing list Dev@wso2.org http://wso2.org/cgi-bin/mailman/listinfo/dev