Not able to map String to Integer via Enum

[Jagadeesh Sadashiv]

Source Object

Request {

    public String classification;

}

Destination Object

DTO {

    public Long classificationId;

}

There is an ENUM that maps classification text to its Id.

Classification {

    POWER(3, "Power")

    private final Integer code;
    private final String  name;

    ProblemReproducible(final int code, final String name) {
       this.code = code;
       this.name = name;
    }

    getCodeByName(context.getSource()){
       Optional< Classification > classification = Arrays.asList(Classification.values()).stream()
        .filter(item -> item.getName().equalsIgnoreCase(name))
        .findFirst();
       return classification.isPresent() ? classification.get().getCode() : null;
    }

}

ModelMapper is not mapping values. I have added converted like below.

Converter<String, Integer> converter = context -> (context.getSource() == null) ? null : Classification.getCodeByName(context.getSource());