01 /* This file is part of the project "Hilbert II" - http://www.qedeq.org
02 *
03 * Copyright 2000-2011, Michael Meyling <mime@qedeq.org>.
04 *
05 * "Hilbert II" is free software; you can redistribute
06 * it and/or modify it under the terms of the GNU General Public
07 * License as published by the Free Software Foundation; either
08 * version 2 of the License, or (at your option) any later version.
09 *
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
13 * GNU General Public License for more details.
14 */
15
16 package org.qedeq.kernel.xml.handler.module;
17
18 import org.qedeq.kernel.se.dto.module.RenameVo;
19 import org.qedeq.kernel.xml.common.XmlSyntaxException;
20 import org.qedeq.kernel.xml.handler.common.AbstractSimpleHandler;
21 import org.qedeq.kernel.xml.handler.common.SimpleAttributes;
22 import org.qedeq.kernel.xml.handler.list.ElementHandler;
23
24
25 /**
26 * Parse a Rename Bound Subject Variable Rule usage.
27 *
28 * @author Michael Meyling
29 */
30 public class RenameHandler extends AbstractSimpleHandler {
31
32 /** Rule value object. */
33 private RenameVo rename;
34
35 /** Handle subject variables. */
36 private final ElementHandler subjectVariableHandler;
37
38 /**
39 * Deals with definitions.
40 *
41 * @param handler Parent handler.
42 */
43 public RenameHandler(final AbstractSimpleHandler handler) {
44 super(handler, "RENAME");
45 subjectVariableHandler = new ElementHandler(this);
46 }
47
48 public final void init() {
49 rename = null;
50 }
51
52 /**
53 * Get Rename Bound Subject Variable Rule usage.
54 *
55 * @return Substitute Free Variable usage.
56 */
57 public final RenameVo getRenameVo() {
58 return rename;
59 }
60
61 public final void startElement(final String name, final SimpleAttributes attributes)
62 throws XmlSyntaxException {
63 if (getStartTag().equals(name)) {
64 rename = new RenameVo();
65 final String ref = attributes.getString("ref");
66 if (ref != null) {
67 rename.setReference(ref);
68 }
69 final Integer occurrence = attributes.getInteger("occurrence");
70 if (occurrence != null) {
71 rename.setOccurrence(occurrence.intValue());
72 }
73 } else if ("VAR".equals(name)) {
74 changeHandler(subjectVariableHandler, name, attributes);
75 } else {
76 throw XmlSyntaxException.createUnexpectedTagException(name);
77 }
78 }
79
80 public final void endElement(final String name) throws XmlSyntaxException {
81 if (getStartTag().equals(name)) {
82 // nothing to do
83 } else if ("VAR".equals(name)) {
84 if (rename != null && rename.getOriginalSubjectVariable() == null) {
85 rename.setOriginalSubjectVariable(subjectVariableHandler.getElement());
86 } else if (rename != null) {
87 rename.setReplacementSubjectVariable(subjectVariableHandler.getElement());
88 }
89 } else {
90 throw XmlSyntaxException.createUnexpectedTagException(name);
91 }
92 }
93
94 }
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