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public class LangUtils {
    public static <K,V> ArrayList<V> getOrCreateArrayList(HashMap<K, ArrayList<V>> hashMap, K key) {
        ArrayList<V> list = hashMap.get(key);
        if (list == null) {
            list = new ArrayList<V>();
            hashMap.put(key, list);
        }
        return list;
    }

    public static Object toPrimitive( Class clazz, String value ) {
        if( Boolean.class == clazz ) return Boolean.parseBoolean( value );
        if( boolean.class == clazz ) return Boolean.parseBoolean( value );
        if( Byte.class == clazz ) return Byte.parseByte( value );
        if( byte.class == clazz ) return Byte.parseByte( value );
        if( Short.class == clazz ) return Short.parseShort( value );
        if( short.class == clazz ) return Short.parseShort( value );
        if( Integer.class == clazz ) return Integer.parseInt(value);
        if (int.class == clazz) return Integer.parseInt(value);
        if( Long.class == clazz ) return Long.parseLong( value );
        if( long.class == clazz ) return Long.parseLong( value );
        if( Float.class == clazz ) return Float.parseFloat( value );
        if( float.class == clazz ) return Long.parseLong( value );
        if( Double.class == clazz ) return Double.parseDouble( value );
        if( double.class == clazz ) return Long.parseLong( value );
        return value;
    }

    public static boolean tryAssign(Object target, String primitiveFieldName, String value) {
        try {
            Field field = target.getClass().getField(primitiveFieldName);
            Object parsedValue = toPrimitive(field.getType(), value);
            field.set(target, parsedValue);
            return true;
        } catch (Exception ex) {
            System.out.println(ExceptionHelper.ExceptionToString(ex));
            Log.d("", ExceptionHelper.ExceptionToString(ex));
            return false;
        }
    }

    /** Converts a hashMap to an arraylist by specifiying a join string to glue the
     * key and value together.
     * Example: Key=IsEnabled, Value=True. Call with joinChar '=' and you get:
     * { "Key=True" } */
    public static <T,U> ArrayList<String> joinKeyValues(HashMap<T, U> dic, String joinChar) {
        Set<T> keys = dic.keySet();
        ArrayList<String> retVal = new ArrayList<>(dic.size());
        for (Object key : keys) {
            Object val = dic.get(key);
            String s = key + joinChar + val;
            retVal.add(s);
        }
        return retVal;
    }
}