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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 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.io.IOException; |
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23 | import java.io.InputStream; |
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24 | ||
25 | import org.apache.commons.logging.Log; |
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26 | import org.apache.commons.logging.LogFactory; |
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27 | import org.xml.sax.EntityResolver; |
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28 | import org.xml.sax.InputSource; |
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29 | import org.xml.sax.SAXException; |
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30 | ||
31 | /** |
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32 | * A resolver to get the database.dtd file for the XML parser from the jar. |
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33 | * |
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34 | * @author <a href="mailto:mpoeschl@marmot.at">Martin Poeschl</a> |
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35 | * @author <a href="mailto:kschrader@karmalab.org">Kurt Schrader</a> |
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36 | * @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a> |
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37 | * @version $Id: DTDResolver.java 476581 2006-11-18 18:14:14Z tv $ |
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38 | */ |
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39 | public class DTDResolver implements EntityResolver |
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40 | { |
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41 | /** Where the DTD is located on the web. */ |
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42 | public static final String WEB_SITE_DTD |
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43 | = "http://db.apache.org/torque/dtd/database_3_3.dtd"; |
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44 | ||
45 | /** Where the 3.2 DTD is located on the web. */ |
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46 | public static final String WEB_SITE_DTD_3_2 |
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47 | = "http://db.apache.org/torque/dtd/database_3_2.dtd"; |
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48 | ||
49 | /** Logging class from commons.logging */ |
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50 | 238 | private static Log log = LogFactory.getLog(DTDResolver.class); |
51 | ||
52 | /** |
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53 | * constructor |
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54 | */ |
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55 | public DTDResolver() |
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56 | throws SAXException |
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57 | 833 | { |
58 | 833 | } |
59 | ||
60 | /** |
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61 | * An implementation of the SAX <code>EntityResolver</code> |
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62 | * interface to be called by the XML parser. If the dtd is the |
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63 | * current Torque DTD, the DTD is read from the generator jar. |
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64 | * In all other cases, null is returned to indicate that the parser |
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65 | * should open a regular connection to the systemId URI. |
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66 | * |
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67 | * @param publicId The public identifier of the external entity |
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68 | * @param systemId The system identifier of the external entity |
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69 | * @return An <code>InputSource</code> for the |
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70 | * <code>database.dtd</code> file in the generator jar, or null. |
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71 | */ |
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72 | public InputSource resolveEntity(String class="keyword">publicId, String systemId) |
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73 | throws IOException, SAXException |
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74 | { |
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75 | 833 | if (WEB_SITE_DTD.equals(systemId)) |
76 | { |
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77 | 0 | return readFromClasspath("database.dtd"); |
78 | } |
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79 | 833 | else if (WEB_SITE_DTD_3_2.equals(systemId)) |
80 | { |
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81 | 833 | return readFromClasspath("database_3_2.dtd"); |
82 | } |
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83 | else |
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84 | { |
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85 | 0 | log.info("Resolver: used default behaviour"); |
86 | 0 | return null; |
87 | } |
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88 | } |
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89 | ||
90 | /** |
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91 | * Reads the resource with the given name from the classpath. |
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92 | * |
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93 | * @param resourceName the name of the resource to read |
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94 | * @return an Inputsource witht the content of the resource. |
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95 | * |
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96 | * @throws SAXException if the resource cannot be read. |
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97 | */ |
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98 | private InputSource readFromClasspath(String resourceName) |
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99 | throws SAXException |
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100 | { |
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101 | try |
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102 | { |
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103 | 833 | InputStream dtdStream |
104 | = getClass().getResourceAsStream(resourceName); |
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105 | ||
106 | // getResource was buggy on many systems including Linux, |
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107 | // OSX, and some versions of windows in jdk1.3. |
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108 | // getResourceAsStream works on linux, maybe others? |
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109 | 833 | if (dtdStream != null) |
110 | { |
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111 | 833 | String pkg = getClass().getName().substring(0, |
112 | getClass().getName().lastIndexOf('.')); |
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113 | 833 | log.info("Resolver: used " + resourceName + " from '" |
114 | + pkg + "' package"); |
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115 | 833 | return new InputSource(dtdStream); |
116 | } |
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117 | else |
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118 | { |
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119 | 0 | log.warn("Could not locate database.dtd"); |
120 | 0 | return null; |
121 | } |
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122 | } |
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123 | 0 | catch (Exception ex) |
124 | { |
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125 | 0 | throw new SAXException( |
126 | "Could not get stream for " + resourceName, |
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127 | ex); |
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128 | } |
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129 | } |
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130 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |