Actually allow numeric indices for sides like api doc claims. Fixes #165

.

src/main/java/li/cil/oc2/common/bus/RPCDeviceBusAdapter.java

@@ -8,6 +8,7 @@
 import li.cil.oc2.api.bus.DeviceBusController;
 import li.cil.oc2.api.bus.device.Device;
 import li.cil.oc2.api.bus.device.rpc.*;
+import li.cil.oc2.api.util.Side;
 import li.cil.oc2.common.Constants;
 import li.cil.oc2.common.bus.device.rpc.RPCDeviceList;
 import li.cil.oc2.common.bus.device.rpc.RPCMethodParameterTypeAdapters;
@@ -67,6 +68,7 @@ public RPCDeviceBusAdapter(final SerialDevice serialDevice, final int maxMessage
             .registerTypeAdapter(RPCDeviceWithIdentifier.class, new RPCDeviceWithIdentifierJsonSerializer())
             .registerTypeHierarchyAdapter(RPCMethod.class, new RPCMethodJsonSerializer())
             .registerTypeAdapter(EmptyMethodGroup.class, new EmptyRPCMethodGroupSerializer())
+            .registerTypeAdapter(Side.class, new SideJsonDeserializer())
             .create();
     }
 

src/main/java/li/cil/oc2/common/serialization/gson/SideJsonDeserializer.java

@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: MIT */
+
+package li.cil.oc2.common.serialization.gson;
+
+import com.google.gson.*;
+import com.google.gson.internal.bind.TypeAdapters;
+import com.google.gson.reflect.TypeToken;
+import li.cil.oc2.api.util.Side;
+
+import java.lang.reflect.Type;
+
+public final class SideJsonDeserializer implements JsonDeserializer<Side> {
+    @Override
+    public Side deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context) throws JsonParseException {
+        if (json.isJsonPrimitive()) {
+            final JsonPrimitive jsonPrimitive = json.getAsJsonPrimitive();
+            if (jsonPrimitive.isNumber()) {
+                return Side.values()[jsonPrimitive.getAsNumber().intValue()];
+            }
+        }
+
+        return (Side) TypeAdapters.ENUM_FACTORY.create(null, TypeToken.get(typeOfT)).fromJsonTree(json);
+    }
+}