src/main/java/moe/ymc/acron/c2s/ReqCmd.java


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package moe.ymc.acron.c2s;

import com.google.gson.*;
import com.google.gson.annotations.SerializedName;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.lang.reflect.Type;

public record ReqCmd(@SerializedName("id") int id,
                     @SerializedName("cmd") @NotNull String cmd,
                     @SerializedName("config") @Nullable ReqSetConfig config)
        implements Request {
    @Override
    public void validate() {
        if (cmd == null) {
            throw new IllegalArgumentException("Property 'cmd' cannot be null.");
        }
    }

    @Override
    public int getId() {
        return id;
    }

    public static class ReqCmdDeserializer implements JsonDeserializer<ReqCmd> {
        @Override
        public ReqCmd deserialize(JsonElement json,
                                  Type typeOfT,
                                  JsonDeserializationContext context) throws JsonParseException {
            final JsonObject object = json.getAsJsonObject();
            final int id = object.has("id") ?
                    object.get("id").getAsInt() :
                    -1;
            final String cmd = object.has("cmd") ?
                    object.get("cmd").getAsString() :
                    null;
            // We cannot use context#deserialize here
            // because RuntimeTypeAdapterFactory keeps kicking in
            // and asking for the 'type' property
            // which is obviously redundant for an inner field.
            // Thus, I pass it directly to the deserializer
            // to bypass the RuntimeTypeAdapterFactory.
            final ReqSetConfig reqSetConfig = object.has("config") ?
                    new ReqSetConfig.ReqSetConfigDeserializer()
                            .deserialize(object.get("config"), ReqSetConfig.class, context) :
                    null;
            return new ReqCmd(id, cmd, reqSetConfig);
        }
    }
}