estonlabs.cxtl.exchanges.mexc.spot.v3.MEXCDeserializer Maven / Gradle / Ivy

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package estonlabs.cxtl.exchanges.mexc.spot.v3;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import estonlabs.cxtl.common.stream.managed.AbstractInboundDeserializer;
import estonlabs.cxtl.common.stream.managed.InboundMessage;
import estonlabs.cxtl.exchanges.mexc.spot.v3.domain.*;
import lombok.NonNull;

import java.io.IOException;
import java.util.List;
import java.util.Map;

public class MEXCDeserializer extends AbstractInboundDeserializer {
    public MEXCDeserializer() {
        super(List.of(
                new MEXCCompositeTarget(),
                new ContainsTarget("c", Map.of(
                        "increase", MEXCOrderBook.class,
                        "limit", MEXCOrderBook.class,
                        "bookTicker", Ticker.class,
                        "miniTicker", MiniTicker.class,
                        "deals", AccountDeal.class,
                        "orders", OrderUpdate.class,
                        "account", AccountUpdate.class
                ))
        ));
    }

    @Override
    protected MEXCInboundContainer wrap(InboundMessage message) {
        return new MEXCInboundContainer(message);
    }


    static final class MEXCCompositeTarget implements AbstractInboundDeserializer.Target {

        private static final List FIELDS_TO_MATCH = List.of("code", "msg");
        private static final String DISCRIMINATOR_FIELD = "msg";
        private static final String DISCRIMINATOR_VALUE = "PONG";
        private static final Class EQ_CLASS = Pong.class;
        private static final Class ELSE_CLASS = EitherSubscribeOrUnsubscribe.class;

        @Override
        public boolean matches(JsonNode root, ObjectMapper mapper) {
            for (var f : FIELDS_TO_MATCH){
                if (root.get(f) == null) return false;
            }
            return true;
        }

        @Override
        public @NonNull Class getType(JsonNode root, ObjectMapper mapper) throws IOException {
            JsonNode jsonNode = root.get(DISCRIMINATOR_FIELD);
            if (jsonNode == null) throw new IOException("Unknown field: " + DISCRIMINATOR_FIELD);
            String type = jsonNode.asText();
            if (DISCRIMINATOR_VALUE.equals(type)){
                return EQ_CLASS;
            } else return ELSE_CLASS;
        }
    }

}