J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.util; |
| 27 | |
| 28 | import java.io.*; |
| 29 | import org.xml.sax.*; |
| 30 | import org.xml.sax.helpers.*; |
| 31 | import org.w3c.dom.*; |
| 32 | import javax.xml.parsers.*; |
| 33 | import javax.xml.transform.*; |
| 34 | import javax.xml.transform.dom.*; |
| 35 | import javax.xml.transform.stream.*; |
| 36 | |
| 37 | /** |
| 38 | * A class used to aid in Properties load and save in XML. Keeping this |
| 39 | * code outside of Properties helps reduce the number of classes loaded |
| 40 | * when Properties is loaded. |
| 41 | * |
| 42 | * @author Michael McCloskey |
| 43 | * @since 1.3 |
| 44 | */ |
| 45 | class XMLUtils { |
| 46 | |
| 47 | // XML loading and saving methods for Properties |
| 48 | |
| 49 | // The required DTD URI for exported properties |
| 50 | private static final String PROPS_DTD_URI = |
| 51 | "http://java.sun.com/dtd/properties.dtd"; |
| 52 | |
| 53 | private static final String PROPS_DTD = |
| 54 | "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + |
| 55 | "<!-- DTD for properties -->" + |
| 56 | "<!ELEMENT properties ( comment?, entry* ) >"+ |
| 57 | "<!ATTLIST properties" + |
| 58 | " version CDATA #FIXED \"1.0\">" + |
| 59 | "<!ELEMENT comment (#PCDATA) >" + |
| 60 | "<!ELEMENT entry (#PCDATA) >" + |
| 61 | "<!ATTLIST entry " + |
| 62 | " key CDATA #REQUIRED>"; |
| 63 | |
| 64 | /** |
| 65 | * Version number for the format of exported properties files. |
| 66 | */ |
| 67 | private static final String EXTERNAL_XML_VERSION = "1.0"; |
| 68 | |
| 69 | static void load(Properties props, InputStream in) |
| 70 | throws IOException, InvalidPropertiesFormatException |
| 71 | { |
| 72 | Document doc = null; |
| 73 | try { |
| 74 | doc = getLoadingDoc(in); |
| 75 | } catch (SAXException saxe) { |
| 76 | throw new InvalidPropertiesFormatException(saxe); |
| 77 | } |
| 78 | Element propertiesElement = (Element)doc.getChildNodes().item(1); |
| 79 | String xmlVersion = propertiesElement.getAttribute("version"); |
| 80 | if (xmlVersion.compareTo(EXTERNAL_XML_VERSION) > 0) |
| 81 | throw new InvalidPropertiesFormatException( |
| 82 | "Exported Properties file format version " + xmlVersion + |
| 83 | " is not supported. This java installation can read" + |
| 84 | " versions " + EXTERNAL_XML_VERSION + " or older. You" + |
| 85 | " may need to install a newer version of JDK."); |
| 86 | importProperties(props, propertiesElement); |
| 87 | } |
| 88 | |
| 89 | static Document getLoadingDoc(InputStream in) |
| 90 | throws SAXException, IOException |
| 91 | { |
| 92 | DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
| 93 | dbf.setIgnoringElementContentWhitespace(true); |
| 94 | dbf.setValidating(true); |
| 95 | dbf.setCoalescing(true); |
| 96 | dbf.setIgnoringComments(true); |
| 97 | try { |
| 98 | DocumentBuilder db = dbf.newDocumentBuilder(); |
| 99 | db.setEntityResolver(new Resolver()); |
| 100 | db.setErrorHandler(new EH()); |
| 101 | InputSource is = new InputSource(in); |
| 102 | return db.parse(is); |
| 103 | } catch (ParserConfigurationException x) { |
| 104 | throw new Error(x); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static void importProperties(Properties props, Element propertiesElement) { |
| 109 | NodeList entries = propertiesElement.getChildNodes(); |
| 110 | int numEntries = entries.getLength(); |
| 111 | int start = numEntries > 0 && |
| 112 | entries.item(0).getNodeName().equals("comment") ? 1 : 0; |
| 113 | for (int i=start; i<numEntries; i++) { |
| 114 | Element entry = (Element)entries.item(i); |
| 115 | if (entry.hasAttribute("key")) { |
| 116 | Node n = entry.getFirstChild(); |
| 117 | String val = (n == null) ? "" : n.getNodeValue(); |
| 118 | props.setProperty(entry.getAttribute("key"), val); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | static void save(Properties props, OutputStream os, String comment, |
| 124 | String encoding) |
| 125 | throws IOException |
| 126 | { |
| 127 | DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
| 128 | DocumentBuilder db = null; |
| 129 | try { |
| 130 | db = dbf.newDocumentBuilder(); |
| 131 | } catch (ParserConfigurationException pce) { |
| 132 | assert(false); |
| 133 | } |
| 134 | Document doc = db.newDocument(); |
| 135 | Element properties = (Element) |
| 136 | doc.appendChild(doc.createElement("properties")); |
| 137 | |
| 138 | if (comment != null) { |
| 139 | Element comments = (Element)properties.appendChild( |
| 140 | doc.createElement("comment")); |
| 141 | comments.appendChild(doc.createTextNode(comment)); |
| 142 | } |
| 143 | |
| 144 | Set keys = props.keySet(); |
| 145 | Iterator i = keys.iterator(); |
| 146 | while(i.hasNext()) { |
| 147 | String key = (String)i.next(); |
| 148 | Element entry = (Element)properties.appendChild( |
| 149 | doc.createElement("entry")); |
| 150 | entry.setAttribute("key", key); |
| 151 | entry.appendChild(doc.createTextNode(props.getProperty(key))); |
| 152 | } |
| 153 | emitDocument(doc, os, encoding); |
| 154 | } |
| 155 | |
| 156 | static void emitDocument(Document doc, OutputStream os, String encoding) |
| 157 | throws IOException |
| 158 | { |
| 159 | TransformerFactory tf = TransformerFactory.newInstance(); |
| 160 | Transformer t = null; |
| 161 | try { |
| 162 | t = tf.newTransformer(); |
| 163 | t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, PROPS_DTD_URI); |
| 164 | t.setOutputProperty(OutputKeys.INDENT, "yes"); |
| 165 | t.setOutputProperty(OutputKeys.METHOD, "xml"); |
| 166 | t.setOutputProperty(OutputKeys.ENCODING, encoding); |
| 167 | } catch (TransformerConfigurationException tce) { |
| 168 | assert(false); |
| 169 | } |
| 170 | DOMSource doms = new DOMSource(doc); |
| 171 | StreamResult sr = new StreamResult(os); |
| 172 | try { |
| 173 | t.transform(doms, sr); |
| 174 | } catch (TransformerException te) { |
| 175 | IOException ioe = new IOException(); |
| 176 | ioe.initCause(te); |
| 177 | throw ioe; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | private static class Resolver implements EntityResolver { |
| 182 | public InputSource resolveEntity(String pid, String sid) |
| 183 | throws SAXException |
| 184 | { |
| 185 | if (sid.equals(PROPS_DTD_URI)) { |
| 186 | InputSource is; |
| 187 | is = new InputSource(new StringReader(PROPS_DTD)); |
| 188 | is.setSystemId(PROPS_DTD_URI); |
| 189 | return is; |
| 190 | } |
| 191 | throw new SAXException("Invalid system identifier: " + sid); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | private static class EH implements ErrorHandler { |
| 196 | public void error(SAXParseException x) throws SAXException { |
| 197 | throw x; |
| 198 | } |
| 199 | public void fatalError(SAXParseException x) throws SAXException { |
| 200 | throw x; |
| 201 | } |
| 202 | public void warning(SAXParseException x) throws SAXException { |
| 203 | throw x; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | } |