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/*
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* Copyright 2002-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.util.xml;
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import java.util.*;
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import java.util.prefs.*;
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import java.io.*;
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/**
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* Simplified XML Support for java.util.prefs. Methods to import and export preference
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* nodes and subtrees.
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*
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* @author Jaroslav Tulach
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* @since 1.7
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*/
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public class DefaultPrefsXmlSupport extends sun.util.xml.PrefsXmlSupport {
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public void export(OutputStream os, final Preferences p, boolean subTree)
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throws IOException, BackingStoreException {
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if (isRemoved(p))
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throw new IllegalStateException("Node has been removed");
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PrintWriter w = new PrintWriter(new OutputStreamWriter(os, "UTF-8"));
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w.println("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>");
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w.println("<!DOCTYPE preferences SYSTEM \"http://java.sun.com/dtd/preferences.dtd\">");
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w.println("<preferences EXTERNAL_XML_VERSION=\"1.0\">");
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w.print(" <root type=\"");
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w.print(p.isUserNode() ? "user" : "system");
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w.println("\">");
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LinkedList<Preferences> ancestors = new LinkedList<Preferences>();
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for (Preferences kid = p, dad = kid.parent(); dad != null;
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kid = dad, dad = kid.parent()) {
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ancestors.addFirst(kid);
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}
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String indent = " ";
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for (Preferences pref : ancestors) {
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indent = " " + indent;
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w.print(indent); w.println("<map/>");
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w.print(indent); w.print("<node name=\""); w.print(pref.name()); w.println("\">");
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}
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putPreferencesInXml(w, indent + " ", p, subTree);
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for (Preferences pref : ancestors) {
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w.print(indent); w.println("</node>");
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indent = indent.substring(2);
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}
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w.println(" </root>");
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w.println("</preferences>");
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w.flush();
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}
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private static void putPreferencesInXml(
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PrintWriter w, String indent, Preferences prefs, boolean subTree
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) throws BackingStoreException {
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Preferences[] kidsCopy = null;
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String[] kidNames = null;
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// Node is locked to export its contents and get a
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// copy of children, then lock is released,
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// and, if subTree = true, recursive calls are made on children
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synchronized (lock(prefs)) {
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// Check if this node was concurrently removed. If yes
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// don't print it
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if (isRemoved(prefs)) {
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return;
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}
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// Put map in xml element
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String[] keys = prefs.keys();
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if (keys.length == 0) {
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w.print(indent); w.println("<map/>");
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} else {
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w.print(indent); w.println("<map>");
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for (int i=0; i<keys.length; i++) {
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w.print(indent); w.print(" <entry key=\"");
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w.print(keys[i]);
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w.print("\" value=\"");
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w.print(prefs.get(keys[i], null));
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w.println("\"/>");
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}
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w.print(indent); w.println("</map>");
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}
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// Recurse if appropriate
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if (subTree) {
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/* Get a copy of kids while lock is held */
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kidNames = prefs.childrenNames();
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kidsCopy = new Preferences[kidNames.length];
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for (int i = 0; i < kidNames.length; i++)
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kidsCopy[i] = prefs.node(kidNames[i]);
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}
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// release lock
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}
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if (subTree) {
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for (int i=0; i < kidNames.length; i++) {
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w.print(indent); w.print("<node name=\"");
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w.print(kidNames[i]);
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w.println("\">");
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putPreferencesInXml(w, " " + indent, kidsCopy[i], subTree);
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w.print(indent); w.println("</node>");
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}
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}
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}
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/**
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* Import preferences from the specified input stream, which is assumed
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* to contain an XML document in the format described in the Preferences
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* spec.
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*
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* @throws IOException if reading from the specified output stream
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* results in an <tt>IOException</tt>.
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* @throws InvalidPreferencesFormatException Data on input stream does not
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* constitute a valid XML document with the mandated document type.
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*/
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public void importPreferences(InputStream is)
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throws IOException, InvalidPreferencesFormatException
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{
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/*
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try {
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Document doc = loadPrefsDoc(is);
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String xmlVersion =
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doc.getDocumentElement().getAttribute("EXTERNAL_XML_VERSION");
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if (xmlVersion.compareTo(EXTERNAL_XML_VERSION) > 0)
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throw new InvalidPreferencesFormatException(
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"Exported preferences file format version " + xmlVersion +
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" is not supported. This java installation can read" +
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" versions " + EXTERNAL_XML_VERSION + " or older. You may need" +
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" to install a newer version of JDK.");
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Element xmlRoot = (Element) doc.getDocumentElement().
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getChildNodes().item(0);
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Preferences prefsRoot =
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(xmlRoot.getAttribute("type").equals("user") ?
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Preferences.userRoot() : Preferences.systemRoot());
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ImportSubtree(prefsRoot, xmlRoot);
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} catch(SAXException e) {
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throw new InvalidPreferencesFormatException(e);
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}
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*/
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}
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/**
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* Create a new prefs XML document.
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*
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private static Document createPrefsDoc( String qname ) {
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try {
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DOMImplementation di = DocumentBuilderFactory.newInstance().
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newDocumentBuilder().getDOMImplementation();
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DocumentType dt = di.createDocumentType(qname, null, PREFS_DTD_URI);
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return di.createDocument(null, qname, dt);
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} catch(ParserConfigurationException e) {
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throw new AssertionError(e);
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}
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}
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/**
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* Load an XML document from specified input stream, which must
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* have the requisite DTD URI.
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*
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private static Document loadPrefsDoc(InputStream in)
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throws SAXException, IOException
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{
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DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
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dbf.setIgnoringElementContentWhitespace(true);
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dbf.setValidating(true);
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dbf.setCoalescing(true);
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dbf.setIgnoringComments(true);
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try {
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DocumentBuilder db = dbf.newDocumentBuilder();
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db.setEntityResolver(new Resolver());
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db.setErrorHandler(new EH());
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return db.parse(new InputSource(in));
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} catch (ParserConfigurationException e) {
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throw new AssertionError(e);
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}
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}
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/**
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* Write XML document to the specified output stream.
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*
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private static final void writeDoc(Document doc, OutputStream out)
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throws IOException
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{
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try {
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TransformerFactory tf = TransformerFactory.newInstance();
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try {
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tf.setAttribute("indent-number", new Integer(2));
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} catch (IllegalArgumentException iae) {
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//Ignore the IAE. Should not fail the writeout even the
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//transformer provider does not support "indent-number".
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}
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Transformer t = tf.newTransformer();
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t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, doc.getDoctype().getSystemId());
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t.setOutputProperty(OutputKeys.INDENT, "yes");
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//Transformer resets the "indent" info if the "result" is a StreamResult with
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//an OutputStream object embedded, creating a Writer object on top of that
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//OutputStream object however works.
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t.transform(new DOMSource(doc),
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new StreamResult(new BufferedWriter(new OutputStreamWriter(out, "UTF-8"))));
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} catch(TransformerException e) {
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throw new AssertionError(e);
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}
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}
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/**
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* Recursively traverse the specified preferences node and store
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* the described preferences into the system or current user
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* preferences tree, as appropriate.
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*
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private static void ImportSubtree(Preferences prefsNode, Element xmlNode) {
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NodeList xmlKids = xmlNode.getChildNodes();
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int numXmlKids = xmlKids.getLength();
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/*
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* We first lock the node, import its contents and get
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* child nodes. Then we unlock the node and go to children
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* Since some of the children might have been concurrently
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* deleted we check for this.
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* /
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Preferences[] prefsKids;
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/* Lock the node * /
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synchronized (lock(prefsNode)) {
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//If removed, return silently
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if (isRemoved(prefsNode))
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return;
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jtulach@1263
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jtulach@1263
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// Import any preferences at this node
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Element firstXmlKid = (Element) xmlKids.item(0);
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ImportPrefs(prefsNode, firstXmlKid);
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prefsKids = new Preferences[numXmlKids - 1];
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jtulach@1263
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// Get involved children
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for (int i=1; i < numXmlKids; i++) {
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Element xmlKid = (Element) xmlKids.item(i);
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prefsKids[i-1] = prefsNode.node(xmlKid.getAttribute("name"));
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}
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jtulach@1263
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} // unlocked the node
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jtulach@1263
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// import children
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jtulach@1263
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for (int i=1; i < numXmlKids; i++)
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ImportSubtree(prefsKids[i-1], (Element)xmlKids.item(i));
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jtulach@1263
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}
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jtulach@1263
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jtulach@1263
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/**
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jtulach@1263
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* Import the preferences described by the specified XML element
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* (a map from a preferences document) into the specified
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* preferences node.
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* /
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private static void ImportPrefs(Preferences prefsNode, Element map) {
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NodeList entries = map.getChildNodes();
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for (int i=0, numEntries = entries.getLength(); i < numEntries; i++) {
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Element entry = (Element) entries.item(i);
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prefsNode.put(entry.getAttribute("key"),
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entry.getAttribute("value"));
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}
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jtulach@1263
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}
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jtulach@1263
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jtulach@1263
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/**
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jtulach@1263
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* Export the specified Map<String,String> to a map document on
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jtulach@1263
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* the specified OutputStream as per the prefs DTD. This is used
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jtulach@1263
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* as the internal (undocumented) format for FileSystemPrefs.
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jtulach@1263
|
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*
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jtulach@1263
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* @throws IOException if writing to the specified output stream
|
jtulach@1263
|
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* results in an <tt>IOException</tt>.
|
jtulach@1263
|
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*/
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jtulach@1263
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public void exportMap(OutputStream os, Map map) throws IOException {
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jtulach@1263
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/*
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jtulach@1263
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Document doc = createPrefsDoc("map");
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jtulach@1263
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Element xmlMap = doc.getDocumentElement( ) ;
|
jtulach@1263
|
289 |
xmlMap.setAttribute("MAP_XML_VERSION", MAP_XML_VERSION);
|
jtulach@1263
|
290 |
|
jtulach@1263
|
291 |
for (Iterator i = map.entrySet().iterator(); i.hasNext(); ) {
|
jtulach@1263
|
292 |
Map.Entry e = (Map.Entry) i.next();
|
jtulach@1263
|
293 |
Element xe = (Element)
|
jtulach@1263
|
294 |
xmlMap.appendChild(doc.createElement("entry"));
|
jtulach@1263
|
295 |
xe.setAttribute("key", (String) e.getKey());
|
jtulach@1263
|
296 |
xe.setAttribute("value", (String) e.getValue());
|
jtulach@1263
|
297 |
}
|
jtulach@1263
|
298 |
|
jtulach@1263
|
299 |
writeDoc(doc, os);
|
jtulach@1263
|
300 |
*/
|
jtulach@1263
|
301 |
}
|
jtulach@1263
|
302 |
|
jtulach@1263
|
303 |
/**
|
jtulach@1263
|
304 |
* Import Map from the specified input stream, which is assumed
|
jtulach@1263
|
305 |
* to contain a map document as per the prefs DTD. This is used
|
jtulach@1263
|
306 |
* as the internal (undocumented) format for FileSystemPrefs. The
|
jtulach@1263
|
307 |
* key-value pairs specified in the XML document will be put into
|
jtulach@1263
|
308 |
* the specified Map. (If this Map is empty, it will contain exactly
|
jtulach@1263
|
309 |
* the key-value pairs int the XML-document when this method returns.)
|
jtulach@1263
|
310 |
*
|
jtulach@1263
|
311 |
* @throws IOException if reading from the specified output stream
|
jtulach@1263
|
312 |
* results in an <tt>IOException</tt>.
|
jtulach@1263
|
313 |
* @throws InvalidPreferencesFormatException Data on input stream does not
|
jtulach@1263
|
314 |
* constitute a valid XML document with the mandated document type.
|
jtulach@1263
|
315 |
*/
|
jtulach@1263
|
316 |
public void importMap(InputStream is, Map m)
|
jtulach@1263
|
317 |
throws IOException, InvalidPreferencesFormatException
|
jtulach@1263
|
318 |
{
|
jtulach@1263
|
319 |
/*
|
jtulach@1263
|
320 |
try {
|
jtulach@1263
|
321 |
Document doc = loadPrefsDoc(is);
|
jtulach@1263
|
322 |
Element xmlMap = doc.getDocumentElement();
|
jtulach@1263
|
323 |
// check version
|
jtulach@1263
|
324 |
String mapVersion = xmlMap.getAttribute("MAP_XML_VERSION");
|
jtulach@1263
|
325 |
if (mapVersion.compareTo(MAP_XML_VERSION) > 0)
|
jtulach@1263
|
326 |
throw new InvalidPreferencesFormatException(
|
jtulach@1263
|
327 |
"Preferences map file format version " + mapVersion +
|
jtulach@1263
|
328 |
" is not supported. This java installation can read" +
|
jtulach@1263
|
329 |
" versions " + MAP_XML_VERSION + " or older. You may need" +
|
jtulach@1263
|
330 |
" to install a newer version of JDK.");
|
jtulach@1263
|
331 |
|
jtulach@1263
|
332 |
NodeList entries = xmlMap.getChildNodes();
|
jtulach@1263
|
333 |
for (int i=0, numEntries=entries.getLength(); i<numEntries; i++) {
|
jtulach@1263
|
334 |
Element entry = (Element) entries.item(i);
|
jtulach@1263
|
335 |
m.put(entry.getAttribute("key"), entry.getAttribute("value"));
|
jtulach@1263
|
336 |
}
|
jtulach@1263
|
337 |
} catch(SAXException e) {
|
jtulach@1263
|
338 |
throw new InvalidPreferencesFormatException(e);
|
jtulach@1263
|
339 |
}
|
jtulach@1263
|
340 |
*/
|
jtulach@1263
|
341 |
}
|
jtulach@1263
|
342 |
/*
|
jtulach@1263
|
343 |
private static class Resolver implements EntityResolver {
|
jtulach@1263
|
344 |
public InputSource resolveEntity(String pid, String sid)
|
jtulach@1263
|
345 |
throws SAXException
|
jtulach@1263
|
346 |
{
|
jtulach@1263
|
347 |
if (sid.equals(PREFS_DTD_URI)) {
|
jtulach@1263
|
348 |
InputSource is;
|
jtulach@1263
|
349 |
is = new InputSource(new StringReader(PREFS_DTD));
|
jtulach@1263
|
350 |
is.setSystemId(PREFS_DTD_URI);
|
jtulach@1263
|
351 |
return is;
|
jtulach@1263
|
352 |
}
|
jtulach@1263
|
353 |
throw new SAXException("Invalid system identifier: " + sid);
|
jtulach@1263
|
354 |
}
|
jtulach@1263
|
355 |
}
|
jtulach@1263
|
356 |
|
jtulach@1263
|
357 |
private static class EH implements ErrorHandler {
|
jtulach@1263
|
358 |
public void error(SAXParseException x) throws SAXException {
|
jtulach@1263
|
359 |
throw x;
|
jtulach@1263
|
360 |
}
|
jtulach@1263
|
361 |
public void fatalError(SAXParseException x) throws SAXException {
|
jtulach@1263
|
362 |
throw x;
|
jtulach@1263
|
363 |
}
|
jtulach@1263
|
364 |
public void warning(SAXParseException x) throws SAXException {
|
jtulach@1263
|
365 |
throw x;
|
jtulach@1263
|
366 |
}
|
jtulach@1263
|
367 |
}
|
jtulach@1263
|
368 |
*/
|
jtulach@1263
|
369 |
private static boolean isRemoved(Preferences p) {
|
jtulach@1263
|
370 |
try {
|
jtulach@1263
|
371 |
p.parent(); // throws IllegalStateException if removed;
|
jtulach@1263
|
372 |
return false;
|
jtulach@1263
|
373 |
} catch (IllegalStateException ex) {
|
jtulach@1263
|
374 |
return true;
|
jtulach@1263
|
375 |
}
|
jtulach@1263
|
376 |
}
|
jtulach@1263
|
377 |
|
jtulach@1263
|
378 |
private static Object lock(Preferences p) {
|
jtulach@1263
|
379 |
/** JST-XXX: Needs reflection or accessor:
|
jtulach@1263
|
380 |
* http://wiki.apidesign.org/wiki/FriendPackages
|
jtulach@1263
|
381 |
return ((AbstractPreferences)prefs).lock;
|
jtulach@1263
|
382 |
*/
|
jtulach@1263
|
383 |
return p;
|
jtulach@1263
|
384 |
}
|
jtulach@1263
|
385 |
}
|