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comparison software/eXist/mpdl-modules/src/org/exist/xquery/modules/mpdltext/EncodeBig5.java @ 0:408254cf2f1d

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author Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
date Wed, 24 Nov 2010 17:24:23 +0100
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-1:000000000000 0:408254cf2f1d
1 /*
2 * eXist Open Source Native XML Database: Extension module
3 * Copyright (C) 2008 Josef Willenborg
4 * jwillenborg@mpiwg-berlin.mpg.de
5 * http://www.mpiwg-berlin.mpg.de
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 * $Id: TextModule.java $
22 */
23 package org.exist.xquery.modules.mpdltext;
24
25 import java.io.UnsupportedEncodingException;
26
27 import org.exist.dom.QName;
28 import org.exist.xquery.BasicFunction;
29 import org.exist.xquery.Cardinality;
30 import org.exist.xquery.FunctionSignature;
31 import org.exist.xquery.XPathException;
32 import org.exist.xquery.XQueryContext;
33 import org.exist.xquery.value.Sequence;
34 import org.exist.xquery.value.SequenceType;
35 import org.exist.xquery.value.StringValue;
36 import org.exist.xquery.value.Type;
37 import org.exist.xquery.value.ValueSequence;
38
39 public class EncodeBig5 extends BasicFunction {
40
41 public final static FunctionSignature signature =
42 new FunctionSignature(
43 new QName("encode-big5", MPDLTextModule.NAMESPACE_URI, MPDLTextModule.PREFIX),
44 "A function which delivers an encoded translation of the big5 input string",
45 new SequenceType[] { new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE) },
46 new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE));
47
48 public EncodeBig5(XQueryContext context) {
49 super(context, signature);
50 }
51
52 public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
53 Sequence seqBig5InputStr = args[0];
54 String big5InputStr = "";
55 String charset = "big5";
56 if (seqBig5InputStr.isEmpty())
57 return Sequence.EMPTY_SEQUENCE;
58 else
59 big5InputStr = seqBig5InputStr.getStringValue();
60 ValueSequence result = null;
61 String resultStr = "";
62 try {
63 byte[] resultBytes = big5InputStr.getBytes(charset);
64 for (int i=0; i < resultBytes.length; i++) {
65 byte b = resultBytes[i];
66 int unsigned = unsignedByteToInt(b);
67 String hexStr = Integer.toHexString(unsigned);
68 resultStr = resultStr + "%" + hexStr;
69 }
70 result = new ValueSequence();
71 result.add(new StringValue(resultStr));
72 } catch (UnsupportedEncodingException e) {
73
74 }
75 return result;
76 }
77
78 private int unsignedByteToInt(byte b) {
79 return (int) b & 0xFF;
80 }
81 }