FilterQuery only allows one type of filter.

[ClemsonGIS]

When creating a Twitter Input you can specify the following Filters: "Follow","Track", and "Locations". In the TwitterInbountTransport.java file the following code snippet only allows for one filter to be used.

> 
> FilterQuery fq = new FilterQuery();
> 
>           String keywords[] = tracks;
> 
>           if(follows != null && follows.length>0)
>               fq.follow(follows);
>           else if(keywords != null && keywords.length>0)
>               fq.track(keywords);
>           else if(locations != null)
>               fq.locations(locations);
>           else
>               throw new Exception("INBOUND_TRANSPORT_NOFILTER_ERROR");
>           
>           fq.count(count);

Is that intentional? I thought more than one filter was allowed? Shouldn't these checks be individual IF statements?

ie.

>                     boolean inFilterSpecified = false;            
> 
>           if(follows != null && follows.length>0) {
>               fq.follow(follows);
>               inFilterSpecified = true;
>         }
>           if(keywords != null && keywords.length>0) {
>               fq.track(keywords);
>               inFilterSpecified = true;
>           }
>           if(locations != null) {
>               fq.locations(locations);
>               inFilterSpecified = true;
>           }
>           if (!inFilterSpecified)
>               throw new Exception("INBOUND_TRANSPORT_NOFILTER_ERROR");

[mzesri]

My understanding is that when you specify follow, track and location filters, they are not applied on top of each other. In other words, they are an "OR" type of relation, not "AND" type of relation. See this documentation here https://dev.twitter.com/streaming/reference/post/statuses/filter. So, the use case for specifying different types of filters simultaneously is very limited. That is probably why the connector only supports one filter at a time.

[ClemsonGIS]

Even if it is an OR operator that combines the predicate parameters, the
code should allow you to use more than one field. As it stands, the code
currently in there doesn't allow that.

Thanks for listening,
Patrick

Though from looking at the site it does seem to support more
On 10/11/2016 1:25 PM, Ming Zhao wrote:

My understanding is that when you specify follow, track and location
filters, they are not applied on top of each other. In other words,
they are an "OR" type of relation, not "AND" type of relation. See
this documentation here
https://dev.twitter.com/streaming/reference/post/statuses/filter
https://urldefense.proofpoint.com/v2/url?u=https-3A__dev.twitter.com_streaming_reference_post_statuses_filter&d=CwMFaQ&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=ZnwTT5r1poLYiHcxL8Afbw&m=dT08NDDMcQeuRUBi5Blq8Fdz9O_MikmUA6-EQl-YzIQ&s=z5InPQ5FCfJ-nlZ4uxr8fBNHIz3mYrOFbMnmOjv_CHk&e=.
So, the use case for specifying different types of filters
simultaneously is very limited. That is probably why the connector
only supports one filter at a time.

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/Patrick Claflin
GIS Sys Admin/Developer
Clemson University (CCGT)
(864) 656-7462
[email protected]
/