1/*
2 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package com.sun.beans.decoder;
26
27/**
28 * This class is intended to handle <char> element.
29 * This element specifies {@code char} values.
30 * The class {@link Character} is used as wrapper for these values.
31 * The result value is created from text of the body of this element.
32 * The body parsing is described in the class {@link StringElementHandler}.
33 * For example:<pre>
34 * &lt;char&gt;X&lt;/char&gt;</pre>
35 * which is equivalent to {@code Character.valueOf('X')} in Java code.
36 * <p>The following attributes are supported:
37 * <dl>
38 * <dt>code
39 * <dd>this attribute specifies character code
40 * <dt>id
41 * <dd>the identifier of the variable that is intended to store the result
42 * </dl>
43 * The {@code code} attribute can be used for characters
44 * that are illegal in XML document, for example:<pre>
45 * &lt;char code="0"/&gt;</pre>
46 *
47 * @since 1.7
48 *
49 * @author Sergey A. Malenkov
50 */
51final class CharElementHandler extends StringElementHandler {
52
53    /**
54     * Parses attributes of the element.
55     * The following attributes are supported:
56     * <dl>
57     * <dt>code
58     * <dd>this attribute specifies character code
59     * <dt>id
60     * <dd>the identifier of the variable that is intended to store the result
61     * </dl>
62     *
63     * @param name   the attribute name
64     * @param value  the attribute value
65     */
66    @Override
67    public void addAttribute(String name, String value) {
68        if (name.equals("code")) { // NON-NLS: the attribute name
69            int code = Integer.decode(value);
70            for (char ch : Character.toChars(code)) {
71                addCharacter(ch);
72            }
73        } else {
74            super.addAttribute(name, value);
75        }
76    }
77
78    /**
79     * Creates {@code char} value from
80     * the text of the body of this element.
81     *
82     * @param argument  the text of the body
83     * @return evaluated {@code char} value
84     */
85    @Override
86    public Object getValue(String argument) {
87        if (argument.length() != 1) {
88            throw new IllegalArgumentException("Wrong characters count");
89        }
90        return Character.valueOf(argument.charAt(0));
91    }
92}
93