UserProperties Class — netty Architecture

Source Code

codec-mqtt/src/main/java/io/netty/handler/codec/mqtt/MqttProperties.java lines 255–300

    public static final class UserProperties extends MqttProperty<List<StringPair>> {
        public UserProperties() {
            super(USER_PROPERTY, new ArrayList<>());
        }

        /**
         * Create user properties from the collection of the String pair values
         *
         * @param values string pairs. Collection entries are copied, collection itself isn't shared
         */
        public UserProperties(Collection<StringPair> values) {
            this();
            this.value.addAll(values);
        }

        private static UserProperties fromUserPropertyCollection(Collection<UserProperty> properties) {
            UserProperties userProperties = new UserProperties();
            for (UserProperty property: properties) {
                userProperties.add(new StringPair(property.value.key, property.value.value));
            }
            return userProperties;
        }

        public void add(StringPair pair) {
            this.value.add(pair);
        }

        public void add(String key, String value) {
            this.value.add(new StringPair(key, value));
        }

        @Override
        public String toString() {
            StringBuilder builder = new StringBuilder("UserProperties(");
            boolean first = true;
            for (StringPair pair: value) {
                if (!first) {
                    builder.append(", ");
                }
                builder.append(pair.key + "->" + pair.value);
                first = false;
            }
            builder.append(")");
            return builder.toString();
        }
    }