gistfile1.groovy

public class Parser {
    public static <T> Map<String, T> getMapFromKeyValuePairs(String str, Convertor<T> convertor) {
        Map<String, T> map = new HashMap<String, T>();
        String[] symbols = str.split(",");

        if (symbols.length > 0) {
            for (String symbol : symbols) {
                String[] tuple = symbol.split(":");
                if (tuple.length == 2) {
                    try {
                        T value = convertor.valueOf(tuple[1]);
                        map.put(tuple[0], value);
                    } catch (Exception e) {
                        System.err.println("Invalid value: " + tuple[1] + " for symbol: " + tuple[0]);
                    }
                } else {
                    System.err.println("Error parsing symbol tuple: " + symbol);
                }
            }
        }

        return (map.isEmpty() ? null : map);
    }

    public interface Convertor<V> {
        V valueOf(String s);
    }
    
    public static final Convertor<Long> LONG_CONVERTOR = new Convertor<Long>() {
        public Long valueOf(String s) {
            return Long.parseLong(s);
        }
    };
    
    public static final Convertor<Boolean> BOOLEAN_CONVERTOR = new Convertor<Boolean>() {
        public Boolean valueOf(String s) {
            return ((s!= null) && (s.equalsIgnoreCase("true") || s.equalsIgnoreCase("yes")));
        }
    };
}

// Usage
Map<String, Boolean> map = Parser.getMapFromKeyValuePairs("IBM:true,MSFT:false", Parser.BOOLEAN_CONVERTOR);
Map<String, Long> map2 = Parser.getMapFromKeyValuePairs("IBM:1000,MSFT:500", Parser.LONG_CONVERTOR);