| 1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
| 2 | * |
| 3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
| 4 | * |
| 5 | * "Hilbert II" is free software; you can redistribute |
| 6 | * it and/or modify it under the terms of the GNU General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2 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 |
| 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 | } |