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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is part of dcm4che, an implementation of DICOM(TM) in
* Java(TM), available at http://sourceforge.net/projects/dcm4che.
*
* The Initial Developer of the Original Code is
* TIANI Medgraph AG.
* Portions created by the Initial Developer are Copyright (C) 2003-2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Gunter Zeilinger <gunter.zeilinger@tiani.com>
* Franz Willer <franz.willer@gwi-ag.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
*
* Helper class to encode/decode Strings with Numeric Character References as defined in SGML.
*
* @author franz.willer
*
* @version $Revision: 2101 $
* @since 25.11.2005
*/
public class NumericCharacterReference {
/**
* Decodes a String with Numeric Character References.
* <p>
*
* @param str A NCR encoded String
* @param unknownCh, A character that is used if nnnn of &#nnnn; is not a int.
*
* @return The decoded String.
*/
public static String decode(String str, char unknownCh) {
StringBuffer sb = new StringBuffer();
int i1=0;
int i2=0;
while(i2<str.length()) {
i1 = str.indexOf("&#",i2);
if (i1 == -1 ) {
sb.append(str.substring(i2));
break ;
}
sb.append(str.substring(i2, i1));
i2 = str.indexOf(";", i1);
if (i2 == -1 ) {
sb.append(str.substring(i1));
break ;
}
String tok = str.substring(i1+2, i2);
try {
int radix = 10 ;
if (tok.charAt(0) == 'x' || tok.charAt(0) == 'X') {
radix = 16 ;
tok = tok.substring(1);
}
sb.append((char) Integer.parseInt(tok, radix));
} catch (NumberFormatException exp) {
sb.append(unknownCh);
}
i2++ ;
}
return sb.toString();
}
/**
* Encode a String with Numeric Character Refernces.
* <p>
* Formats each character < 0x20 or > 0x7f to &#nnnn; where nnnn is the char value as int.
* <p>
*
* @param str The raw String
* @return The encoded String
*/
public static String encode( String str ) {
char[] ch = str.toCharArray();
StringBuffer sb = new StringBuffer();
for ( int i = 0 ; i < ch.length ; i++ ) {
if ( ch[i] < 0x20 || ch[i] > 0x7f )
sb.append("&#").append((int) ch[i]).append(";");
else
sb.append(ch[i]);
}
return sb.toString();
}
}
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