1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.util.xml; |
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27 |
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28 import java.io.*; |
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29 import java.util.*; |
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30 import java.nio.charset.*; |
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31 import java.util.Map.Entry; |
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32 import org.xml.sax.*; |
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33 import org.w3c.dom.*; |
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34 import javax.xml.parsers.*; |
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35 import javax.xml.transform.*; |
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36 import javax.xml.transform.dom.*; |
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37 import javax.xml.transform.stream.*; |
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38 |
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39 import sun.util.spi.XmlPropertiesProvider; |
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40 |
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41 /** |
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42 * A {@code XmlPropertiesProvider} implementation that uses the JAXP API |
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43 * for parsing. |
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44 * |
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45 * @author Michael McCloskey |
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46 * @since 1.3 |
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47 */ |
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48 public class PlatformXmlPropertiesProvider extends XmlPropertiesProvider { |
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49 |
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50 // XML loading and saving methods for Properties |
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51 |
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52 // The required DTD URI for exported properties |
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53 private static final String PROPS_DTD_URI = |
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54 "http://java.sun.com/dtd/properties.dtd"; |
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55 |
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56 private static final String PROPS_DTD = |
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57 "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + |
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58 "<!-- DTD for properties -->" + |
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59 "<!ELEMENT properties ( comment?, entry* ) >"+ |
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60 "<!ATTLIST properties" + |
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61 " version CDATA #FIXED \"1.0\">" + |
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62 "<!ELEMENT comment (#PCDATA) >" + |
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63 "<!ELEMENT entry (#PCDATA) >" + |
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64 "<!ATTLIST entry " + |
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65 " key CDATA #REQUIRED>"; |
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66 |
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67 /** |
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68 * Version number for the format of exported properties files. |
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69 */ |
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70 private static final String EXTERNAL_XML_VERSION = "1.0"; |
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71 |
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72 @Override |
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73 public void load(Properties props, InputStream in) |
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74 throws IOException, InvalidPropertiesFormatException |
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75 { |
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76 Document doc = null; |
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77 try { |
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78 doc = getLoadingDoc(in); |
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79 } catch (SAXException saxe) { |
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80 throw new InvalidPropertiesFormatException(saxe); |
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81 } |
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82 Element propertiesElement = doc.getDocumentElement(); |
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83 String xmlVersion = propertiesElement.getAttribute("version"); |
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84 if (xmlVersion.compareTo(EXTERNAL_XML_VERSION) > 0) |
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85 throw new InvalidPropertiesFormatException( |
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86 "Exported Properties file format version " + xmlVersion + |
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87 " is not supported. This java installation can read" + |
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88 " versions " + EXTERNAL_XML_VERSION + " or older. You" + |
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89 " may need to install a newer version of JDK."); |
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90 importProperties(props, propertiesElement); |
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91 } |
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92 |
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93 static Document getLoadingDoc(InputStream in) |
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94 throws SAXException, IOException |
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95 { |
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96 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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97 dbf.setIgnoringElementContentWhitespace(true); |
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98 dbf.setValidating(true); |
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99 dbf.setCoalescing(true); |
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100 dbf.setIgnoringComments(true); |
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101 try { |
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102 DocumentBuilder db = dbf.newDocumentBuilder(); |
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103 db.setEntityResolver(new Resolver()); |
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104 db.setErrorHandler(new EH()); |
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105 InputSource is = new InputSource(in); |
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106 return db.parse(is); |
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107 } catch (ParserConfigurationException x) { |
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108 throw new Error(x); |
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109 } |
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110 } |
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111 |
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112 static void importProperties(Properties props, Element propertiesElement) { |
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113 NodeList entries = propertiesElement.getChildNodes(); |
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114 int numEntries = entries.getLength(); |
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115 int start = numEntries > 0 && |
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116 entries.item(0).getNodeName().equals("comment") ? 1 : 0; |
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117 for (int i=start; i<numEntries; i++) { |
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118 Element entry = (Element)entries.item(i); |
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119 if (entry.hasAttribute("key")) { |
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120 Node n = entry.getFirstChild(); |
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121 String val = (n == null) ? "" : n.getNodeValue(); |
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122 props.setProperty(entry.getAttribute("key"), val); |
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123 } |
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124 } |
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125 } |
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126 |
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127 @Override |
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128 public void store(Properties props, OutputStream os, String comment, |
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129 String encoding) |
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130 throws IOException |
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131 { |
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132 // fast-fail for unsupported charsets as UnsupportedEncodingException may |
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133 // not be thrown later (see JDK-8000621) |
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134 try { |
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135 Charset.forName(encoding); |
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136 } catch (IllegalCharsetNameException | UnsupportedCharsetException x) { |
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137 throw new UnsupportedEncodingException(encoding); |
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138 } |
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139 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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140 DocumentBuilder db = null; |
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141 try { |
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142 db = dbf.newDocumentBuilder(); |
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143 } catch (ParserConfigurationException pce) { |
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144 assert(false); |
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145 } |
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146 Document doc = db.newDocument(); |
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147 Element properties = (Element) |
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148 doc.appendChild(doc.createElement("properties")); |
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149 |
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150 if (comment != null) { |
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151 Element comments = (Element)properties.appendChild( |
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152 doc.createElement("comment")); |
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153 comments.appendChild(doc.createTextNode(comment)); |
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154 } |
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155 |
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156 synchronized (props) { |
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157 for (Entry<Object, Object> e : props.entrySet()) { |
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158 final Object k = e.getKey(); |
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159 final Object v = e.getValue(); |
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160 if (k instanceof String && v instanceof String) { |
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161 Element entry = (Element)properties.appendChild( |
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162 doc.createElement("entry")); |
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163 entry.setAttribute("key", (String)k); |
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164 entry.appendChild(doc.createTextNode((String)v)); |
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165 } |
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166 } |
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167 } |
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168 emitDocument(doc, os, encoding); |
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169 } |
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170 |
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171 static void emitDocument(Document doc, OutputStream os, String encoding) |
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172 throws IOException |
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173 { |
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174 TransformerFactory tf = TransformerFactory.newInstance(); |
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175 Transformer t = null; |
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176 try { |
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177 t = tf.newTransformer(); |
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178 t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, PROPS_DTD_URI); |
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179 t.setOutputProperty(OutputKeys.INDENT, "yes"); |
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180 t.setOutputProperty(OutputKeys.METHOD, "xml"); |
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181 t.setOutputProperty(OutputKeys.ENCODING, encoding); |
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182 } catch (TransformerConfigurationException tce) { |
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183 assert(false); |
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184 } |
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185 DOMSource doms = new DOMSource(doc); |
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186 StreamResult sr = new StreamResult(os); |
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187 try { |
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188 t.transform(doms, sr); |
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189 } catch (TransformerException te) { |
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190 throw new IOException(te); |
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191 } |
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192 } |
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193 |
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194 private static class Resolver implements EntityResolver { |
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195 public InputSource resolveEntity(String pid, String sid) |
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196 throws SAXException |
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197 { |
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198 if (sid.equals(PROPS_DTD_URI)) { |
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199 InputSource is; |
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200 is = new InputSource(new StringReader(PROPS_DTD)); |
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201 is.setSystemId(PROPS_DTD_URI); |
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202 return is; |
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203 } |
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204 throw new SAXException("Invalid system identifier: " + sid); |
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205 } |
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206 } |
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207 |
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208 private static class EH implements ErrorHandler { |
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209 public void error(SAXParseException x) throws SAXException { |
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210 throw x; |
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211 } |
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212 public void fatalError(SAXParseException x) throws SAXException { |
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213 throw x; |
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214 } |
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215 public void warning(SAXParseException x) throws SAXException { |
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216 throw x; |
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217 } |
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218 } |
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219 |
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220 } |
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