sPFShared/src/main/java/it/polimi/spf/shared/model/ProfileField.java
public static ProfileField<?> lookup(String identifier) {
		for (ProfileField<?> field : sFields) {
			if (field.getIdentifier().equals(identifier)) {
				return field;
			}
		}

		return null;
	}
public static ProfileField<?> lookup(String identifier) {
		for (ProfileField<?> field : sFields) {
			if (field.getIdentifier().equals(identifier)) {
				return field;
			}
		}

		return null;
	}
Lookups the {@link ProfileField} identified by the given identifier

@param identifier
- the identifier of the field to lookup
@return the {@link ProfileField} identified by the given identifier, or
null if none matches