1/*
2 * Copyright 2009 Mike Cumings
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *   http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.kenai.jbosh;
18
19/**
20 * Data type representing the getValue of the {@code ack} attribute of the
21 * {@code bosh} element.
22 */
23final class AttrAck extends AbstractAttr<String> {
24
25    /**
26     * Creates a new attribute object.
27     *
28     * @param val attribute getValue
29     * @throws BOSHException on parse or validation failure
30     */
31    private AttrAck(final String val) throws BOSHException {
32        super(val);
33    }
34
35    /**
36     * Creates a new attribute instance from the provided String.
37     *
38     * @param str string representation of the attribute
39     * @return attribute instance or {@code null} if provided string is
40     *  {@code null}
41     * @throws BOSHException on parse or validation failure
42     */
43    static AttrAck createFromString(final String str)
44    throws BOSHException {
45        if (str == null) {
46            return null;
47        } else {
48            return new AttrAck(str);
49        }
50    }
51
52}
53