[SOLVED] Java custom annotation for a behaviour like trim

Java custom annotation for a behaviour like trim

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;
}

Solution

Yes, we can easily do it with

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

Now implement your TrimDeserializer as below

public class TrimDeserializer extends JsonDeserializer<String> {
    @Override
    public String deserialize(JsonParser parser, DeserializationContext ctx) throws IOException {
        String str = parser.getText();

        if (str == null) {
            return null;
        }

        return str.trim();
    }
}