1 /*
2 The contents of this file are subject to the Mozilla Public License Version 1.1
3 (the "License"); you may not use this file except in compliance with the License.
4 You may obtain a copy of the License at http://www.mozilla.org/MPL/
5 Software distributed under the License is distributed on an "AS IS" basis,
6 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
7 specific language governing rights and limitations under the License.
8
9 The Original Code is "ExtendedMllpDecoder.java". Description:
10 "Decodes an InputStream into a String, but respects a potentially populated field MSH-18"
11
12 The Initial Developer of the Original Code is University Health Network. Copyright (C)
13 2013. All Rights Reserved.
14
15 Contributor(s): ______________________________________.
16
17 Alternatively, the contents of this file may be used under the terms of the
18 GNU General Public License (the "GPL"), in which case the provisions of the GPL are
19 applicable instead of those above. If you wish to allow use of your version of this
20 file only under the terms of the GPL and not to allow others to use your version
21 of this file under the MPL, indicate your decision by deleting the provisions above
22 and replace them with the notice and other provisions required by the GPL License.
23 If you do not delete the provisions above, a recipient may use your version of
24 this file under either the MPL or the GPL.
25 */
26
27 package ca.uhn.hl7v2.llp;
28
29 import java.nio.charset.Charset;
30
31 import org.slf4j.Logger;
32 import org.slf4j.LoggerFactory;
33
34 /**
35 * ExtendedMllpDecoder decodes an InputStream into a String, but obeys a potentially
36 * populated field MSH-18 to determine the character set. If the field is not populated
37 * or an unknown charset name is given or MSH-18 cannot be parsed at all, a log
38 * is written and the default charset is used instead.
39 *
40 * @author Christian Ohr
41 */
42 class ExtendedMllpDecoder extends MllpDecoder {
43
44 private static final Logger LOG = LoggerFactory.getLogger(ExtendedMllpDecoder.class);
45
46 // for test purposes only
47 private Charset lastCharset;
48
49 ExtendedMllpDecoder(Charset charset) {
50 super(charset);
51 }
52
53 /**
54 * Use the charset as specified in MSH-18, fallback to configured charset
55 * and eventually to ASCII.
56 *
57 * @param data HL7 message as byte sequence
58 * @return decoded message
59 */
60 @Override
61 protected String toString(byte[] data) {
62 Charset charset = CharSetUtil.checkCharset(data, this.charset);
63 lastCharset = charset;
64 return asString(data, charset);
65 }
66
67 // for test purposes only
68 Charset getLastCharset() {
69 return lastCharset;
70 }
71 }