import org.apache.lucene.queryparser.flexible.core.nodes.QuotedFieldQueryNode; //导入依赖的package包/类
@Override
protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {

  // the old Lucene Parser ignores FuzzyQueryNode that are also PrefixWildcardQueryNode or WildcardQueryNode
  // we do the same here, also ignore empty terms
  if (node instanceof FieldQueryNode || node instanceof FuzzyQueryNode) {      
    FieldQueryNode fqn = (FieldQueryNode) node;      
    CharSequence text = fqn.getText(); 
    
    // do not process wildcards for TermRangeQueryNode children and 
    // QuotedFieldQueryNode to reproduce the old parser behavior
    if (fqn.getParent() instanceof TermRangeQueryNode 
        || fqn instanceof QuotedFieldQueryNode 
        || text.length() <= 0){
      // Ignore empty terms
      return node;
    }
    
    // Code below simulates the old lucene parser behavior for wildcards
    
    if (isPrefixWildcard(text)) {        
      PrefixWildcardQueryNode prefixWildcardQN = new PrefixWildcardQueryNode(fqn);
      return prefixWildcardQN;
      
    } else if (isWildcard(text)){
      WildcardQueryNode wildcardQN = new WildcardQueryNode(fqn);
      return wildcardQN;
    }
           
  }

  return node;

}