1/*
2 * Copyright (c) 2004, 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 */
25
26package javax.xml.bind.annotation.adapters;
27
28
29
30/**
31 * {@link XmlAdapter} to handle {@code xs:normalizedString}.
32 *
33 * <p>
34 * Replaces any tab, CR, and LF by a whitespace character ' ',
35 * as specified in <a href="http://www.w3.org/TR/xmlschema-2/#rf-whiteSpace">the whitespace facet 'replace'</a>
36 *
37 * @author Kohsuke Kawaguchi, Martin Grebac
38 * @since 1.6, JAXB 2.0
39 */
40public final class NormalizedStringAdapter extends XmlAdapter<String,String> {
41    /**
42     * Replace any tab, CR, and LF by a whitespace character ' ',
43     * as specified in <a href="http://www.w3.org/TR/xmlschema-2/#rf-whiteSpace">the whitespace facet 'replace'</a>
44     */
45    public String unmarshal(String text) {
46        if(text==null)      return null;    // be defensive
47
48        int i=text.length()-1;
49
50        // look for the first whitespace char.
51        while( i>=0 && !isWhiteSpaceExceptSpace(text.charAt(i)) )
52            i--;
53
54        if( i<0 )
55            // no such whitespace. replace(text)==text.
56            return text;
57
58        // we now know that we need to modify the text.
59        // allocate a char array to do it.
60        char[] buf = text.toCharArray();
61
62        buf[i--] = ' ';
63        for( ; i>=0; i-- )
64            if( isWhiteSpaceExceptSpace(buf[i]))
65                buf[i] = ' ';
66
67        return new String(buf);
68    }
69
70    /**
71     * No-op.
72     *
73     * Just return the same string given as the parameter.
74     */
75        public String marshal(String s) {
76            return s;
77        }
78
79
80    /**
81     * Returns true if the specified char is a white space character
82     * but not 0x20.
83     */
84    protected static boolean isWhiteSpaceExceptSpace(char ch) {
85        // most of the characters are non-control characters.
86        // so check that first to quickly return false for most of the cases.
87        if( ch>=0x20 )   return false;
88
89        // other than we have to do four comparisons.
90        return ch == 0x9 || ch == 0xA || ch == 0xD;
91    }
92}
93