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