Terra/common/implementation/src/test/java/MetaTest.java

import com.dfsek.tectonic.annotations.Value;
import com.dfsek.tectonic.config.ConfigTemplate;
import com.dfsek.tectonic.config.Configuration;
import com.dfsek.tectonic.loading.ConfigLoader;
import com.dfsek.tectonic.yaml.YamlConfiguration;
import com.dfsek.terra.api.config.meta.Meta;
import com.dfsek.terra.config.preprocessor.MetaListLikePreprocessor;
import com.dfsek.terra.config.preprocessor.MetaMapPreprocessor;
import com.dfsek.terra.config.preprocessor.MetaValuePreprocessor;
import org.junit.jupiter.api.Test;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MetaTest {
    @Test
    public void testMetaList() {
        Configuration meta = new YamlConfiguration(MetaTest.class.getResourceAsStream("/meta.yml"), "meta.yml");
        Configuration metaTarget = new YamlConfiguration(MetaTest.class.getResourceAsStream("/metaTarget.yml"), "metaTarget.yml");

        Map<String, Configuration> configurationMap = new HashMap<>();

        configurationMap.put(meta.getName(), meta);
        configurationMap.put(metaTarget.getName(), metaTarget);

        ConfigLoader loader = new ConfigLoader();
        loader.registerPreprocessor(Meta.class, new MetaValuePreprocessor(configurationMap));
        loader.registerPreprocessor(Meta.class, new MetaListLikePreprocessor(configurationMap));
        loader.registerPreprocessor(Meta.class, new MetaMapPreprocessor(configurationMap));

        loader.load(new MetaListConfig(), meta).list.forEach(System.out::println);
    }

    private static final class MetaListConfig implements ConfigTemplate {
        @Value("list")
        private @Meta List<@Meta String> list;
    }

    @Test
    public void testMetaMap() {
        Configuration meta = new YamlConfiguration(MetaTest.class.getResourceAsStream("/meta.yml"), "meta.yml");
        Configuration metaTarget = new YamlConfiguration(MetaTest.class.getResourceAsStream("/metaTarget.yml"), "metaTarget.yml");

        Map<String, Configuration> configurationMap = new HashMap<>();

        configurationMap.put(meta.getName(), meta);
        configurationMap.put(metaTarget.getName(), metaTarget);

        ConfigLoader loader = new ConfigLoader();
        loader.registerPreprocessor(Meta.class, new MetaValuePreprocessor(configurationMap));
        loader.registerPreprocessor(Meta.class, new MetaListLikePreprocessor(configurationMap));
        loader.registerPreprocessor(Meta.class, new MetaMapPreprocessor(configurationMap));

        loader.load(new MetaMapConfig(), meta).map.forEach((k, v) -> System.out.println(k + ": " + v));
    }

    private static final class MetaMapConfig implements ConfigTemplate {
        @Value("map")
        private @Meta Map<@Meta String, @Meta String> map;
    }
}