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https://issues.apache.org/jira/browse/PLC4X-113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118470#comment-17118470
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Alessandro Rossignoli commented on PLC4X-113:
---------------------------------------------
Thank you [~julian.feinauer], looking here:
[https://github.com/apache/plc4x/blob/4a74ff526aeb57e978005e37c878fe55021462aa/plc4j/spi/src/main/java/org/apache/plc4x/java/spi/messages/DefaultPlcWriteRequest.java#L255]
I get back a null on plcFieldPlcValueBiFunction, so there are not handlers
available.
To be completely honest I am using plc4j in Scala and using an Avro
GenericData.Array instead of a plain array or a java.util.ArrayList, I will try
those basic types first to get into a more basic and known situation.
> Implement support for complex field types in the PLC4X API
> ----------------------------------------------------------
>
> Key: PLC4X-113
> URL: https://issues.apache.org/jira/browse/PLC4X-113
> Project: Apache PLC4X
> Issue Type: New Feature
> Components: API
> Reporter: Julian Feinauer
> Priority: Critical
>
> *This is a (possibly) incompatible change.*
> Currently we have support for primitives as well as lists (arrays) as first
> class "ciitzens" of the PLC4X model.
> Especially, when thinking about OPC UA, but also other protocols like ADS
> (and even S7) support complex objects in their programming model.
> Thus, it is necessary to refactor / extend the API to support these complex
> objects.
> I guess we need at least
> * primitives
> * lists
> * maps (should be equal to "structs")
> Basically, this should be roughly equivalent to what one can represent with
> JSON.
> Thus, the API could be structured i two ways.. first, we could use an
> internal Node Tree to represent the objects, but we could also provide to use
> someone elses NodeTree or structure to represent the Objects.
> For example Jackson.. this would even allow us to directly map these objects
> to POJOs via Jackson.
> As example for such a model, one can look at that of Apache Calcite:
> https://github.com/apache/calcite/blob/3fa29455664bec0056c436491b369e0cd72242ea/core/src/main/java/org/apache/calcite/rel/type/RelDataType.java
> They have an interface with methods
> {code:java}
> public interface DataType
> {
> // Checker
> boolean isMap();
> boolean isList();
> boolean isPrimitive();
> // Getter for complex types
> DataType get(String key);
> DataType get(Long i);
>
> // Primitive getters
> long getLong();
> String getString();
> //...
> }
> {code}
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