Throw error for Clustered Features with filters

[geographika]

Feature Request

Add a warning or throw an error if an OL feature is clustered when trying to apply a filter similar to below.

var pointSimplePoint = {
    name: "OL Style",
    rules: [{
        name: "OL Style Rule 0",
        filter: [">=", "MyProp", "10"],
        symbolizers: [{
            kind: "Mark",
            wellKnownName: "Circle",
            color: "#FF0000",
            radius: 6
        }]
    }]
};

Is your feature request related to a problem? Please describe.

Spent several hours trying to work out why a style wasn't being applied to features before realising the layer had clustering. The features weren't displayed at all, rather than a default or non-style.

Describe the solution you'd like

In geoStylerFilterToOlParserFilter throw an error if a clustered feature is passed.

Check with t.get('features') or check the source for ol.source.Cluster?

Describe alternatives you've considered

Add a sourcemap to the npm release package, or a single file debug build (in node_modules/geostyler-openlayers-parser/browser)
This highlighted the problem quite quickly and allowed easy debugging.
This may be the better solution as it may be possible to style clustered filters using functions?

A single file debug build would be very useful for many situations when developing.

[jansule]

@geographika thanks for creating this issue.

In geoStylerFilterToOlParserFilter throw an error if a clustered feature is passed.
Check with t.get('features') or check the source for ol.source.Cluster?

Personally, I would rather refer from that, as this logic should be handled by users of the parser. The purpose of the parser is to provide a style object/function, the handling of when to apply such a style is not part of that.

@KaiVolland what do you think about that?

A single file debug build would be very useful for many situations when developing.

When developing/debugging we usually use our local react builds instead of the browser build. But I agree, for users that are not directly developing the parser and just want to see why something is not working as expected, having a debug browser build can be useful.

Would you be willing to provide a PR for that? This would mainly require an additional config file that extends browser-build.config.js and a corresponding build script in package.json.

[raitisbe]

I would prefer having a possibility to style clustered features instead. It's almost possible even right now if we provide

filter: ["!=", "features", "[object Object]"]

for the rule and use TextSymbolizer with {{features}} template.

The missing thing seems to be a way how to pass valueAdjust function to
OlStyleUtil.resolveAttributeTemplate = function (feature, template, noValueFoundText, valueAdjust) { .
Its never set anywhere or maybe I'm missing something.