1 package org.apache.torque.engine.database.transform;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001-2003 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Turbine" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache Turbine", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import java.io.IOException;
58 import java.io.InputStream;
59 import java.net.URL;
60
61 import org.apache.commons.logging.Log;
62 import org.apache.commons.logging.LogFactory;
63 import org.xml.sax.EntityResolver;
64 import org.xml.sax.InputSource;
65 import org.xml.sax.SAXException;
66
67 /***
68 * A resolver to get the database.dtd file for the XML parser from the jar.
69 *
70 * @author <a href="mailto:mpoeschl@marmot.at">Martin Poeschl</a>
71 * @author <a href="mailto:kschrader@karmalab.org">Kurt Schrader</a>
72 * @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a>
73 * @version $Id: DTDResolver.java,v 1.9 2003/07/31 16:04:06 dlr Exp $
74 */
75 public class DTDResolver implements EntityResolver
76 {
77 /*** Where the DTD is located on the web. */
78 public static final String WEB_SITE_DTD
79 = "http://db.apache.org/torque/dtd/database_3_1.dtd";
80
81 /*** InputSource for <code>database.dtd</code>. */
82 private InputSource databaseDTD = null;
83
84 /*** Logging class from commons.logging */
85 private static Log log = LogFactory.getLog(DTDResolver.class);
86
87 /***
88 * constructor
89 */
90 public DTDResolver()
91 throws SAXException
92 {
93 try
94 {
95 InputStream dtdStream
96 = getClass().getResourceAsStream("database.dtd");
97
98 // getResource was buggy on many systems including Linux,
99 // OSX, and some versions of windows in jdk1.3.
100 // getResourceAsStream works on linux, maybe others?
101 if (dtdStream != null)
102 {
103 databaseDTD = new InputSource(dtdStream);
104 }
105 else
106 {
107 log.warn("Could not locate the database.dtd");
108 }
109 }
110 catch (Exception ex)
111 {
112 throw new SAXException("Could not get stream for database.dtd", ex);
113 }
114 }
115
116 /***
117 * An implementation of the SAX <code>EntityResolver</code>
118 * interface to be called by the XML parser.
119 *
120 * @param publicId The public identifier of the external entity
121 * @param systemId The system identifier of the external entity
122 * @return An <code>InputSource</code> for the
123 * <code>database.dtd</code> file.
124 */
125 public InputSource resolveEntity(String publicId, String systemId)
126 throws IOException
127 {
128 if (databaseDTD != null && WEB_SITE_DTD.equals(systemId))
129 {
130 String pkg = getClass().getName().substring(0,
131 getClass().getName().lastIndexOf('.'));
132 log.info("Resolver: used database.dtd from '"
133 + pkg + "' package");
134 return databaseDTD;
135 }
136 else if (systemId == null || "".equals(systemId.trim()))
137 {
138 log.info("Resolver: used '" + WEB_SITE_DTD + '\'');
139 return getInputSource(WEB_SITE_DTD);
140 }
141 else
142 {
143 log.info("Resolver: used '" + systemId + '\'');
144 return getInputSource(systemId);
145 }
146 }
147
148 /***
149 * Retrieves a XML input source for the specified URL.
150 *
151 * @param urlString The URL of the input source.
152 * @return <code>InputSource</code> for the URL.
153 */
154 private InputSource getInputSource(String urlString)
155 throws IOException
156 {
157 URL url = new URL(urlString);
158 return new InputSource(url.openStream());
159 }
160 }
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