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Java > Open Source Codes > org > xquark > xquery > typing > Utils


1 /*
2  * This file belongs to the XQuark distribution.
3  * Copyright (C) 2003 XQuark Group.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307.
18  * You can also get it at http://www.gnu.org/licenses/lgpl.html
19  *
20  * For more information on this software, see http://www.xquark.org.
21  */
22
23 package org.xquark.xquery.typing;
24
25 import org.xquark.schema.Particle;
26 import org.xquark.schema.SchemaException;
27 import org.xquark.schema.SchemaManager;
28 import org.xquark.xpath.StepExpr;
29 import org.xquark.xquery.parser.XQueryException;
30
31 public class Utils {
32
33     private static ComputeSubTypeVisitor subTypeVisistor = null;
34
35     public static QType getSubType(byte contextType, QType qtype, StepExpr step, SchemaManager schemamanager, boolean inPredicate) throws TypeException, XQueryException {
36         if (subTypeVisistor == null)
37             subTypeVisistor = new ComputeSubTypeVisitor();
38         subTypeVisistor.reset(contextType, step, schemamanager);
39         try {
40             qtype.accept(subTypeVisistor);
41         } catch (XQueryException e) {
42             throw new TypeException(e.getMessage());
43         }
44         QType result = subTypeVisistor.getResultQType();
45         if (result != null && !inPredicate)
46             result = result.changeOccurence(QType.computeOccurence(qtype.getOccurence(), result.getOccurence()));
47         return result;
48     }
49
50     private static OccurrenceVisitor occurrenceVisistor = null;
51
52     public static OccurrenceVisitor getOccurrenceVisitor() {
53         return occurrenceVisistor;
54     }
55
56     public static void getSubType(Particle particle, String JavaDoc namespace, String JavaDoc name, SchemaManager schemamanager) throws TypeException {
57         if (occurrenceVisistor == null)
58             occurrenceVisistor = new OccurrenceVisitor();
59         occurrenceVisistor.reset(namespace, name, schemamanager);
60         try {
61             particle.accept(occurrenceVisistor);
62         } catch (SchemaException e) {
63             throw new TypeException(e.getMessage());
64         }
65     }
66
67 }
68
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