| 1 | /* |
| 2 | * Copyright (c) 2005 The PseudoQ Project. |
| 3 | * |
| 4 | * This file is part of PseudoQ. |
| 5 | * |
| 6 | * PseudoQ is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Lesser General Public License as published by |
| 8 | * the Free Software Foundation; either version 2.1 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * PseudoQ is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public License |
| 17 | * along with PseudoQ; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | package net.sourceforge.pseudoq.model.io; |
| 22 | |
| 23 | import java.io.InputStream; |
| 24 | |
| 25 | import org.xml.sax.InputSource; |
| 26 | |
| 27 | /** |
| 28 | * Custom entity resolver to allow validating puzzle files against a local copy |
| 29 | * of the DTD. |
| 30 | * @author <a href="http://sourceforge.net/users/stevensa">Andrew Stevens</a> |
| 31 | */ |
| 32 | public class CustomEntityResolver implements org.xml.sax.EntityResolver { |
| 33 | /** Log4J logger */ |
| 34 | private static final org.apache.log4j.Logger log = |
| 35 | org.apache.log4j.LogManager.getLogger(CustomEntityResolver.class); |
| 36 | |
| 37 | /** Puzzle DTD's public ID. */ |
| 38 | public static final String PUZZLE_PUBLICID = "-//PseudoQ//DTD Puzzle v1.0//EN"; |
| 39 | /** Puzzle DTD's system ID. */ |
| 40 | public static final String PUZZLE_SYSTEMID = |
| 41 | "http://pseudoq.sourceforge.net/dtds/pseudoq-puzzle-1.0.dtd"; |
| 42 | /** Path to local DTD. */ |
| 43 | public static final String PUZZLE_DTD = |
| 44 | "net/sourceforge/pseudoq/model/io/pseudoq-puzzle-1.0.dtd"; |
| 45 | |
| 46 | /** Creates a new instance of CustomEntityResolver */ |
| 47 | public CustomEntityResolver() { |
| 48 | } |
| 49 | |
| 50 | public InputSource resolveEntity(String publicId, String systemId) |
| 51 | throws org.xml.sax.SAXException, java.io.IOException { |
| 52 | InputSource ret = null; |
| 53 | |
| 54 | log.debug("Resolve PUBLIC '" + publicId + "' SYSTEM '" + systemId + "'"); |
| 55 | if (PUZZLE_PUBLICID.equals(publicId) || PUZZLE_SYSTEMID.equals(systemId)) { |
| 56 | InputStream in = getClass().getClassLoader().getResourceAsStream(PUZZLE_DTD); |
| 57 | ret = new InputSource(in); |
| 58 | log.debug("using local copy of DTD"); |
| 59 | } |
| 60 | |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | } |