package eu.eudat.models.helpers.common;

import java.util.LinkedList;
import java.util.List;


public class ColumnOrderings {

    private String[] fields;

    public String[] getFields() {
        return fields;
    }

    public void setFields(String[] fields) {
        this.fields = fields;
    }

    public Ordering[] getFieldOrderings() throws Exception {
        List<Ordering> orderings = new LinkedList<>();
        for(String field : fields){
            orderings.add(this.orderingFromString(field));
        }
        return orderings.toArray(new Ordering[orderings.size()]);
    }

    private Ordering orderingFromString(String field) throws Exception {
        if(field.startsWith("+")) return new Ordering(field.replace("+",""), Ordering.OrderByType.ASC);
        else if(field.startsWith("-")) return new Ordering(field.replace("-",""), Ordering.OrderByType.DESC);
        else throw new Exception("Unsupported Field Order Type");
    }
}