finders and jquery

[ycabello]

Hi again friends!
I have a problem generating a finder... the problem (1 of them) is:
is there any way to create a dynamic finder wich alows me to search even if the user inputs just 1 of the parameters?
this is the code I manually created:

public static TypedQuery<Doc> searcher(String name,  Date minDate, Date maxDate, String description) {
	    	int count=0;
	    	String query="SELECT Doc FROM Doc AS doc WHERE ";
	    	EntityManager em =Doc.entityManager();	        
	        if (name != null && name.length() > 0){
	        	if(count>0){
	        		query+=" AND ";
	        	}
	        	query+="doc.name = :name";
	        	count++;
	        }
	        if ((minDate != null)&&(maxDate!=null)){
	        	if(count>0){
	        		query+=" AND ";
	        	}	        	
	        	query+="doc.Date BETWEEN :minDate AND :maxDate";
	        	count++;
	        }
	        if (description != null && description.length() > 0){
	        	if(count>0){
	        		query+=" AND ";
	        	}
	        	query+="doc.description = :description";
	        	count++;
	        }
	        TypedQuery<Doc> q = em.createQuery(query, Doc.class);	        
	        if((name!=null)&&(name.length()>0)){q.setParameter("name", name);}
	        if(minDate!=null){q.setParameter("minDate", minDate);}
	        if(maxDate!=null){q.setParameter("maxDate", maxDate);}
	        if((description!=null)&&(description.length()>0)){q.setParameter("description", description);}	       
	        return q;
	    }

the idea is the query could be done even if the user just inputs 1 parameter... I found this code a little complex, I don't know if roo (with finder add command) can make a finder with similar features...
and my second problem is... how can I encapsulate a finder form within a popup? I'm using fancybox
thanks