1 /*
   2  * Copyright (c) 2004, 2010, 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 
  26 package javax.xml.bind.annotation.adapters;
  27 
  28 
  29 
  30 /**
  31  * {@link XmlAdapter} to handle <tt>xs:normalizedString</tt>.
  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 JAXB 2.0
  39  */
  40 public 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 }