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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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