server/protocols/jmap-draft/src/main/java/org/apache/james/jmap/draft/json/OptionalZonedDateTimeSerializer.java

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package org.apache.james.jmap.draft.json;

import java.io.IOException;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Optional;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

public class OptionalZonedDateTimeSerializer extends JsonSerializer<Optional<ZonedDateTime>> {

    @Override
    public void serialize(Optional<ZonedDateTime> optionalZonedDateTime, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeString(
            optionalZonedDateTime.map(zonedDateTime -> zonedDateTime.format(DateTimeFormatter.ISO_DATE_TIME))
                .orElse(null));
    }
}