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annotate software/eXist/mpdl-modules/src/org/exist/xquery/modules/mpdltext/GetDonatusQueryVariants.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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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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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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 java.util.ArrayList;
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26
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27 import org.exist.dom.QName;
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28 import org.exist.xquery.BasicFunction;
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29 import org.exist.xquery.Cardinality;
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30 import org.exist.xquery.FunctionSignature;
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31 import org.exist.xquery.XPathException;
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32 import org.exist.xquery.XQueryContext;
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33 import org.exist.xquery.value.Sequence;
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34 import org.exist.xquery.value.SequenceType;
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35 import org.exist.xquery.value.StringValue;
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36 import org.exist.xquery.value.Type;
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37 import org.exist.xquery.value.ValueSequence;
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38
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39 import de.mpg.mpiwg.berlin.mpdl.donatus.xmlrpc.DonatusCache;
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40 import de.mpg.mpiwg.berlin.mpdl.donatus.xmlrpc.DonatusVariant;
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41 import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException;
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42
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43 /**
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44 * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de)
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45 */
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46 public class GetDonatusQueryVariants extends BasicFunction {
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47
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48 public final static FunctionSignature signature =
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49 new FunctionSignature(
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50 new QName("get-donatus-query-variants", MPDLTextModule.NAMESPACE_URI, MPDLTextModule.PREFIX),
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51 "A function which delivers morphological variants (seperated by |) of a given Lucene query string of a given " +
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52 "language over the lemma of that variant by the Donatus language technology",
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53 new SequenceType[] { new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE),
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54 new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE) },
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55 new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE));
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56
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57 public GetDonatusQueryVariants(XQueryContext context) {
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58 super(context, signature);
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59 }
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60
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61 public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
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62 Sequence langSeq = args[0];
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63 Sequence luceneQueryStringSeq = args[1];
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64 String language = "";
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65 String luceneQueryString = "";
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66 if (langSeq.isEmpty() || luceneQueryStringSeq.isEmpty())
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67 return Sequence.EMPTY_SEQUENCE;
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68 language = langSeq.getStringValue();
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69 luceneQueryString = luceneQueryStringSeq.getStringValue();
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70 ArrayList<DonatusVariant> resultVariants = null;
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71 try {
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72 DonatusCache donatusCache = DonatusCache.getInstance();
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73 resultVariants = donatusCache.getQueryVariants(language, luceneQueryString);
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74 } catch (ApplicationException e) {
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75 throw new XPathException(e);
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76 }
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77 ValueSequence result = new ValueSequence();
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78 String resultStr = "";
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79 int size = resultVariants.size();
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80 for (int i=0; i<size; i++) {
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81 String variantStr = resultVariants.get(i).getForm();
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82 resultStr = resultStr + variantStr + "|";
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83 }
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84 if (size == 0) {
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85 result.add(new StringValue(""));
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86 } else {
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87 resultStr = resultStr.substring(0, resultStr.length() - 1); // without last | character
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88 result.add(new StringValue(resultStr));
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89 }
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90 return result;
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91 }
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92 }