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package javax.faces.application;

import javax.faces.context.FacesContext;
import javax.faces.application.Application;

import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;

class SharedUtils {

    /*
    * Determine whether String is a mixed value binding expression or not.
    */
    static boolean isMixedExpression(String expression) {

        if (null == expression) {
            return false;
        }

        // if it doesn't start and end with delimiters
        return (!(expression.startsWith("#{") && expression.endsWith("}")))
                  && isExpression(expression);

    }


    /*
    * Determine whether String is a value binding expression or not.
    */
    static boolean isExpression(String expression) {

        if (null == expression) {
            return false;
        }

        //check to see if attribute has an expression
        int start = expression.indexOf("#{");
        return start != -1 && expression.indexOf('}', start+2) != -1;
    }

    static Map<String, List<String>> evaluateExpressions(FacesContext context, Map<String, List<String>> map) {
        if (map != null && !map.isEmpty()) {
            Map<String, List<String>> ret = new HashMap<String, List<String>>(map.size());
            for (Map.Entry<String, List<String>> entry : map.entrySet()) {
                ret.put(entry.getKey(), evaluateExpressions(context, entry.getValue()));
            }
            
            return ret;
        }
        
        return map;
    }
     
    static List<String> evaluateExpressions(FacesContext context, List<String> values) {
         if (!values.isEmpty()) {
             List<String> ret = new ArrayList<String>(values.size());
             Application app = context.getApplication();
             for (String val : values) {
                 if (val != null) {
                     String value = val.trim();
                     if (isExpression(value)) {
                         value = app.evaluateExpressionGet(context,
                                                           value,
                                                           String.class);
                     }
                     ret.add(value);
                 }
             }
             
             return ret;
         }
         return values;
     }



}

     

