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Library that provides client access to the FIT-Connect api-endpoints for sending, subscribing and routing

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package dev.fitko.fitconnect.client.zbp;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;
import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;

public class ObjectMapperProvider {

    public static ObjectMapper createObjectMapper() {
        return new ObjectMapper()
                .registerModule(new SimpleModule().addSerializer(new CreateDateSerializer()))
                .setSerializationInclusion(JsonInclude.Include.NON_NULL);
    }

    private static class CreateDateSerializer extends StdSerializer {
        private static final DateTimeFormatter formatter = new DateTimeFormatterBuilder().appendInstant(3).toFormatter();

        protected CreateDateSerializer() {
            super(Instant.class);
        }

        @Override
        public void serialize(Instant instant, JsonGenerator jsonGenerator, SerializerProvider provider) throws IOException {
            String formattedInstant = formatter.format(instant);
            jsonGenerator.writeString(formattedInstant);
        }
    }
}