binancej/src/main/java/com/sigmaflare/binancej/entities/transform/CandlestickDeserializer.java

package com.sigmaflare.binancej.entities.transform;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.sigmaflare.binancej.entities.Candlestick;

import java.io.IOException;
import java.math.BigDecimal;

/**
 * A custom deserializer for OrderBookDepth. Binance returns some non-standard looking data
 * in it's array, so we convert the entire thing into our own representation here to make
 * it easier to use.
 */
public class CandlestickDeserializer extends StdDeserializer<Candlestick> {

    public CandlestickDeserializer() {
        this(null);
    }

    public CandlestickDeserializer(Class<?> vc) {
        super(vc);
    }

    @Override
    public Candlestick deserialize(JsonParser jp, DeserializationContext context) throws IOException {
        JsonNode n = jp.getCodec().readTree(jp);

        return Candlestick
                    .builder()
                    .openTime(n.get(0).asLong())
                    .open(new BigDecimal(n.get(1).asText()))
                    .high(new BigDecimal(n.get(2).asText()))
                    .low(new BigDecimal(n.get(3).asText()))
                    .close(new BigDecimal(n.get(4).asText()))
                    .volume(new BigDecimal(n.get(5).asText()))
                    .closeTime(n.get(6).asLong())
                    .quoteAssetVolume(new BigDecimal(n.get(7).asText()))
                    .numberOfTrades(n.get(8).asLong())
                    .takerBuyBaseAssetVolume(new BigDecimal(n.get(9).asText()))
                    .takerBuyQuoteAssetVolume(new BigDecimal(n.get(10).asText()))
                    .build();
    }
}