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org.apache.torque.engine.database.transform.DTDResolver |
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1 | package org.apache.torque.engine.database.transform; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import java.io.IOException; |
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20 | import java.io.InputStream; |
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21 | import java.net.URL; |
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22 | ||
23 | import org.apache.commons.logging.Log; |
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24 | import org.apache.commons.logging.LogFactory; |
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25 | import org.xml.sax.EntityResolver; |
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26 | import org.xml.sax.InputSource; |
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27 | import org.xml.sax.SAXException; |
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28 | ||
29 | /** |
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30 | * A resolver to get the database.dtd file for the XML parser from the jar. |
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31 | * |
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32 | * @author <a href="mailto:mpoeschl@marmot.at">Martin Poeschl</a> |
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33 | * @author <a href="mailto:kschrader@karmalab.org">Kurt Schrader</a> |
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34 | * @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a> |
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35 | * @version $Id: DTDResolver.java 239624 2005-08-24 12:18:03Z henning $ |
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36 | */ |
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37 | public class DTDResolver implements EntityResolver |
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38 | { |
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39 | /** Where the DTD is located on the web. */ |
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40 | public static final String WEB_SITE_DTD |
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41 | = "http://db.apache.org/torque/dtd/database_3_2.dtd"; |
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42 | ||
43 | /** InputSource for <code>database.dtd</code>. */ |
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44 | 49 | private InputSource databaseDTD = null; |
45 | ||
46 | /** Logging class from commons.logging */ |
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47 | 14 | private static Log log = LogFactory.getLog(DTDResolver.class); |
48 | ||
49 | /** |
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50 | * constructor |
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51 | */ |
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52 | public DTDResolver() |
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53 | throws SAXException |
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54 | 49 | { |
55 | try |
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56 | { |
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57 | 49 | InputStream dtdStream |
58 | = getClass().getResourceAsStream("database.dtd"); |
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59 | ||
60 | // getResource was buggy on many systems including Linux, |
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61 | // OSX, and some versions of windows in jdk1.3. |
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62 | // getResourceAsStream works on linux, maybe others? |
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63 | 49 | if (dtdStream != null) |
64 | { |
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65 | 49 | databaseDTD = new InputSource(dtdStream); |
66 | } |
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67 | else |
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68 | { |
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69 | 0 | log.warn("Could not locate database.dtd"); |
70 | } |
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71 | } |
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72 | 0 | catch (Exception ex) |
73 | { |
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74 | 0 | throw new SAXException("Could not get stream for database.dtd", ex); |
75 | 49 | } |
76 | 49 | } |
77 | ||
78 | /** |
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79 | * An implementation of the SAX <code>EntityResolver</code> |
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80 | * interface to be called by the XML parser. |
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81 | * |
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82 | * @param publicId The public identifier of the external entity |
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83 | * @param systemId The system identifier of the external entity |
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84 | * @return An <code>InputSource</code> for the |
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85 | * <code>database.dtd</code> file. |
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86 | */ |
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87 | public InputSource resolveEntity(String class="keyword">publicId, String systemId) |
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88 | throws IOException |
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89 | { |
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90 | 49 | if (databaseDTD != null && WEB_SITE_DTD.equals(systemId)) |
91 | { |
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92 | 49 | String pkg = getClass().getName().substring(0, |
93 | getClass().getName().lastIndexOf('.')); |
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94 | 49 | log.info("Resolver: used database.dtd from '" |
95 | + pkg + "' package"); |
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96 | 49 | return databaseDTD; |
97 | } |
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98 | 0 | else if (systemId == null || "".equals(systemId.trim())) |
99 | { |
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100 | 0 | log.info("Resolver: used '" + WEB_SITE_DTD + '\''); |
101 | 0 | return getInputSource(WEB_SITE_DTD); |
102 | } |
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103 | else |
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104 | { |
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105 | 0 | log.info("Resolver: used '" + systemId + '\''); |
106 | 0 | return getInputSource(systemId); |
107 | } |
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108 | } |
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109 | ||
110 | /** |
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111 | * Retrieves a XML input source for the specified URL. |
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112 | * |
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113 | * @param urlString The URL of the input source. |
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114 | * @return <code>InputSource</code> for the URL. |
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115 | */ |
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116 | private InputSource getInputSource(String urlString) |
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117 | throws IOException |
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118 | { |
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119 | 0 | URL url = new URL(urlString); |
120 | 0 | return new InputSource(url.openStream()); |
121 | } |
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122 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |