add IdentifierProvider and wrapper implementations

lib/src/main/java/net/tomatentum/marinara/wrapper/IdentifierProvider.java

@@ -0,0 +1,72 @@
+package net.tomatentum.marinara.wrapper;
+
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.logging.log4j.Logger;
+
+import io.leangen.geantyref.GenericTypeReflector;
+import net.tomatentum.marinara.interaction.ident.InteractionIdentifier;
+import net.tomatentum.marinara.util.LoggerUtil;
+import net.tomatentum.marinara.util.ReflectionUtil;
+
+public class IdentifierProvider {
+
+    public static IdentifierProvider of(Converter<?>... converter) {
+        return new IdentifierProvider(Arrays.asList(converter));
+    }
+
+    private Map<Class<?>, Converter<?>> converter;
+    private Logger logger = LoggerUtil.getLogger(getClass());
+
+    private IdentifierProvider(List<Converter<?>> converter) {
+        this.converter = new HashMap<>();
+        for (Converter<?> conv : converter) {
+            if (conv.getClass().getName().contains("$$Lambda"))
+                throw new IllegalArgumentException("Lambdas cannot be used for IdentifierConverter because of Type erasure.");
+            Type type = GenericTypeReflector.getExactSuperType(conv.getClass(), Converter.class);
+            Type parameterType = (Class<?>) ((ParameterizedType) type).getActualTypeArguments()[0];
+            if (!(parameterType instanceof Class))
+                throw new IllegalArgumentException("Only full Class types are supported by IdentiferConverters");
+            this.converter.put((Class<?>) parameterType, conv);
+        }
+    }
+
+    public InteractionIdentifier provide(Object context) {
+        Type type = ReflectionUtil.getMostSpecificClass(
+            converter.keySet().stream().filter(x -> x.isAssignableFrom(context.getClass())).toArray(Class<?>[]::new), 
+            context.getClass());
+
+        if (type == null)
+            logger.debug("No Identifier converter found for context {}", context.getClass().toString());
+
+        @SuppressWarnings("unchecked")
+        Converter<Object> conv = (Converter<Object>) converter.get(type);
+
+        return conv.convert(context);
+    }
+
+    @FunctionalInterface
+    public interface Converter<T extends Object> {
+        InteractionIdentifier convert(T context);
+    }
+
+    public static class LambdaWrapper<T extends Object> implements Converter<T> {
+
+        private Converter<T> converter;
+
+        LambdaWrapper(Converter<T> converter) {
+            this.converter = converter;
+        }
+
+        @Override
+        public InteractionIdentifier convert(T context) {
+            return this.converter.convert(context);
+        }
+
+    }
+}