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

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Erstellung
author Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
date Wed, 24 Nov 2010 17:24:23 +0100
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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1 /*
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2 * eXist Open Source Native XML Database: Extension module
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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3 * Copyright (C) 2008 Josef Willenborg
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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4 * jwillenborg@mpiwg-berlin.mpg.de
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5 * http://www.mpiwg-berlin.mpg.de
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6 *
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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7 * This program is free software; you can redistribute it and/or
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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8 * modify it under the terms of the GNU Lesser General Public License
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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9 * as published by the Free Software Foundation; either version 2
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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10 * of the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful,
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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15 * GNU Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public License
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18 * along with this program; if not, write to the Free Software
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19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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20 *
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21 * $Id: TextModule.java $
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22 */
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23 package org.exist.xquery.modules.mpdltext;
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24
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25 import org.exist.dom.QName;
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26 import org.exist.xquery.BasicFunction;
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27 import org.exist.xquery.Cardinality;
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28 import org.exist.xquery.FunctionSignature;
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29 import org.exist.xquery.XPathException;
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30 import org.exist.xquery.XQueryContext;
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31 import org.exist.xquery.value.Sequence;
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32 import org.exist.xquery.value.SequenceType;
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33 import org.exist.xquery.value.StringValue;
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34 import org.exist.xquery.value.Type;
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35 import org.exist.xquery.value.ValueSequence;
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36
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37 import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException;
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38 import de.mpg.mpiwg.berlin.mpdl.lt.lex.db.LexHandler;
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39
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40 /**
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41 * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de)
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42 */
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43 public class GetTranscodedText extends BasicFunction {
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44
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45 public final static FunctionSignature signature =
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46 new FunctionSignature(
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47 new QName("transcode", MPDLTextModule.NAMESPACE_URI, MPDLTextModule.PREFIX),
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48 "A function which transcodes the given string to the given coding. First parameter " +
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49 "is the from coding (e.g. buckwalter), second parameter is the to coding (e.g. unicode) " +
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50 "and third parameter is the text which should be transcoded.",
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51 new SequenceType[] { new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
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52 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
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53 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE) },
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54 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE));
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55
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56 public GetTranscodedText(XQueryContext context) {
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57 super(context, signature);
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58 }
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59
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60 public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
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61 Sequence fromEncodingSeq = args[0];
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62 Sequence toEncodingSeq = args[1];
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63 Sequence inputStrSeq = args[2];
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64 String fromEncoding = "";
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65 String toEncoding = "";
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66 String inputStr = "";
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67 if (fromEncodingSeq.isEmpty() || toEncodingSeq.isEmpty())
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68 return Sequence.EMPTY_SEQUENCE;
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69 fromEncoding = fromEncodingSeq.getStringValue();
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70 toEncoding = toEncodingSeq.getStringValue();
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71 inputStr = inputStrSeq.getStringValue();
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72 String transcodedStr = null;
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73 try {
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74 LexHandler lexHandler = LexHandler.getInstance();
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75 transcodedStr = lexHandler.transcode(fromEncoding, toEncoding, inputStr);
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76 } catch (ApplicationException e) {
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77 throw new XPathException(e);
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78 }
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79 ValueSequence result = new ValueSequence();
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80 result.add(new StringValue(transcodedStr));
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81 return result;
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82 }
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83
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84 }