Antea IFC Export

Library to convert .eywa files to .ifc files.
Class tech.antea.ifc.Main contains an example of usage.

Usage

.eywa files can be deserialized with:

import buildingsmart.ifc.IfcProject;
import com.fasterxml.jackson.databind.ObjectMapper;
import it.imc.persistence.po.eytukan.EywaRoot;
//...
    ObjectMapper objectMapper = new ObjectMapper();
    EywaRoot eywaRoot = objectMapper.readValue(eywaFile, EywaRoot.class);

The conversion between EywaRoot and IfcProject is done this way:

    EywaToIfcConverter builder = new EywaToIfcConverter();
    EywaReader director = new EywaReader(builder);
    director.convert(eywaRoot);
    IfcProject result = builder.getResult();

Finally, .ifc files can be serialized with:

    EywaToIfcConverter.writeToFile(result, outputFile);

Tests and deterministic output

The content of .ifc files generated from the same input .eywa won't always be the same, because of timestamps and random UUIDs. These are removed before comparing output files and expected output files in tests, so there are no issues there.
Another issue could arise from elements of Sets being serialized in different orders (because when iterating through a Set the order is generally unpredictable), so at the moment LinkedHashSets are used, and they should keep being used in future modifications for all Sets to avoid test failures.
Another way to solve this issue would be writing a parser to create an IfcProject from each expected output file, and then compare that to the IfcProject generated from the actual output file (after removing timestamps and UUIDs).

Useful links

IFC 2x3 documentation
CoordinationView 2.0
Implementation agreements
EXPRESS specification (it's a more recent version than the one used in IFC, but they're similar)
Implementation guidance