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.FormulaVo;
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 formula.
27 *
28 * @author Michael Meyling
29 */
30 public class FormulaHandler extends AbstractSimpleHandler {
31
32 /** Value object for formula. */
33 private FormulaVo formula;
34
35 /** Handles {@link org.qedeq.kernel.se.base.list.Element}s. */
36 private final ElementHandler elementHandler;
37
38
39 /**
40 * Handles formulas.
41 *
42 * @param handler Parent handler.
43 */
44 public FormulaHandler(final AbstractSimpleHandler handler) {
45 super(handler, "FORMULA");
46 elementHandler = new ElementHandler(this);
47 }
48
49 public final void init() {
50 formula = null;
51 }
52
53 /**
54 * Get parsed result.
55 *
56 * @return FormulaOrTerm.
57 */
58 public final FormulaVo getFormula() {
59 return formula;
60 }
61
62 public final void startElement(final String name, final SimpleAttributes attributes)
63 throws XmlSyntaxException {
64 if (getStartTag().equals(name)) {
65 // nothing to do
66 } else if (getLevel() > 1) {
67 changeHandler(elementHandler, name, attributes);
68 } else {
69 throw XmlSyntaxException.createUnexpectedTagException(name);
70 }
71 }
72
73 public final void endElement(final String name) throws XmlSyntaxException {
74 if (getStartTag().equals(name)) {
75 formula = new FormulaVo(elementHandler.getElement());
76 } else if (getLevel() <= 1) {
77 throw XmlSyntaxException.createUnexpectedTagException(name);
78 }
79 }
80
81 }
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