public SetBasedFieldSelector(Set fieldsToLoad,
    Set lazyFieldsToLoad) 
{
    this.fieldsToLoad = fieldsToLoad;
    this.lazyFieldsToLoad = lazyFieldsToLoad;
}

Pass in the Set of Field names to load and the Set of Field names to load lazily. If both are null, the Document will not have any Field on it.

Parameters:

fieldsToLoad - A Set of String field names to load. May be empty, but not null

lazyFieldsToLoad - A Set of String field names to load lazily. May be empty, but not null

 public FieldSelectorResult accept(String fieldName) 
{
    FieldSelectorResult result = FieldSelectorResult.NO_LOAD;
    if (fieldsToLoad.contains(fieldName) == true){
      result = FieldSelectorResult.LOAD;
    }
    if (lazyFieldsToLoad.contains(fieldName) == true){
      result = FieldSelectorResult.LAZY_LOAD;
    }                                           
    return result;
}

Indicate whether to load the field with the given name or not. If the Field#name() is not in either of the initializing Sets, then org.apache.lucene.document.FieldSelectorResult#NO_LOAD is returned. If a Field name is in both fieldsToLoad and lazyFieldsToLoad, lazy has precedence.