spring - Thymeleaf: How to work with a AbstractIterationElementProcessor class -

anyone work abstractiterationelementprocessor derived class in spring project uses thymeleaf? trying use implement kind of tag:

<form:form ...>     ... </form:form> 

the element iterated based on list should generated inside processor class, based on array list of field of class model class passed view (named command).

in each iteration, 1 element of list processed switch-like structure inside tag , inner element chosen (form:input, form:select, etc).

right now, have code:

public class formprocessor extends abstractiterationelementprocessor {    public formprocessor() {     super("form");   }    @override   public void processclonedhostiterationelement(arguments arguments, element iteratedchild) {     //   }    @override   public string getiteratedelementname(arguments arguments, element element) {     return "form";   }    @override   public boolean removehostiterationelement(arguments arguments, element element) {     return false;   }    @override   public abstractiterationelementprocessor.iterationspec getiterationspec(arguments arguments, element element) {     return null;   }    @override   public int getprecedence() {     return 1000;   }  } 

but have trouble understand implement in each method. can give hint on how that?