Java custom annotation for a behaviour like trim

Question

I have to write the trim functionality like below.

public void setUserComment (String value) {
    this.userComment  = (value != null) ? value.trim() : value;
}

But this needs to apply this in lots of places in our existing place. any idea that uses custom annotation for this behavior. like.

@MyCustomTrim
public void setUserComment (String value) {
    this.userComment  = value;
}

Answer 1

yes we can easily done by

@JsonDeserialize(using = CustomDeSerializer.class)
private String name;

Now Implement your the customDeSerializer as below

public class CustomDeSerializer extends JsonDeserializer<String> {
@Override
public String deserialize(JsonParser p, DeserializationContext ctx)
        throws IOException {
    String str = p.getText();
    try {
        return str.trim();
    } catch (Exception e) {
        System.err.println(e);
        return null;
    }
}

}