hyperdaml.java
来自「Semantic Web Ontology Editor」· Java 代码 · 共 400 行
JAVA
400 行
package org.mindswap.swoop.utils;import java.io.IOException;import java.io.PrintWriter;import java.io.StringReader;import java.io.StringWriter;import javax.xml.parsers.ParserConfigurationException;import org.xml.sax.InputSource;import org.xml.sax.SAXException;// $Id: hyperdaml.java,v 1.22 2002/08/14 21:49:14 mdean Exp $/** * produce a hypertext version of a DAML/RDF document. */public class HyperDAML{ static PrintWriter out = null; static String source = null; static String prefix = ""; /** * are we being run as a non-parsed-header CGI script? */ static boolean nph = false; static int rdfDepth = 0; // just in case rdf:RDF is erroneously nested static String quoted(String string) { return '"' + string + '"'; } /** * escape HTML characters */ static String escaped(String string) { StringBuffer retval = new StringBuffer(); for (int i = 0; i < string.length(); i++) { char ch = string.charAt(i); switch (ch) { case '<': retval.append("<"); break; case '>': retval.append(">"); break; case '&': retval.append("&"); break; default: retval.append(ch); } } return retval.toString(); } /** * determine if this is the RDF (M&S) namespace */ static boolean rdfNamespace(String namespaceURI) { return namespaceURI.equals("http://www.w3.org/1999/02/22-rdf-syntax-ns#"); } /** * determine if this is the named RDF attribute. */ static boolean rdfAttribute(org.xml.sax.Attributes atts, int index, String name) { String localName = atts.getLocalName(index); // be liberal about namespaces return localName.equals(name); } static String maybeApplyPrefix(String uri) { // check if self-relative if (uri.equals("") || (uri.charAt(0) == '#')) return uri; else return prefix + uri; } /** * turn a relative URI into an absolute URI */ static String makeAbsolute(String maybeRelative) { try { return new java.net.URL(new java.net.URL(source), maybeRelative).toString(); } catch (java.net.MalformedURLException e) { return maybeRelative; } } static public String formatRDF(String rdf, String source) throws ParserConfigurationException, IOException, SAXException { HyperDAML.source = source; StringWriter sw = new StringWriter(); out = new PrintWriter(sw); generate(rdf); return sw.getBuffer().toString(); } static void generate(String rdf) throws ParserConfigurationException, IOException, SAXException { javax.xml.parsers.SAXParserFactory spf = javax.xml.parsers.SAXParserFactory.newInstance(); spf.setValidating(false); // not needed for our use -- reinforce default javax.xml.parsers.SAXParser saxParser = spf.newSAXParser(); org.xml.sax.XMLReader xmlReader = saxParser.getXMLReader(); xmlReader.setFeature("http://xml.org/sax/features/namespaces", true); // get xmlns attributes xmlReader.setFeature("http://xml.org/sax/features/namespace-prefixes", true); org.xml.sax.helpers.DefaultHandler handler = new org.xml.sax.helpers.DefaultHandler() { boolean foundDAML = false; boolean startedHTML = false; org.xml.sax.Locator locator; /** * stack indicating whether each level of element has children. */ java.util.Stack elementStack = new java.util.Stack(); /** * code to check if this is the first child for the parent element */ void child() { if (elementStack.empty()) return; Boolean b = (Boolean) elementStack.peek(); if (b.equals(Boolean.TRUE)) { // not first child return; } // close element start out.print(">"); elementStack.pop(); elementStack.push(Boolean.TRUE); } public void setLocator(org.xml.sax.Locator l) { locator = l; } public void startDocument() { } void startHTML() { if (startedHTML) return; out.println("<html>"); out.println(" <body>"); startedHTML = true; } public void startElement(String namespaceURI, String localName, String rawName, org.xml.sax.Attributes atts) throws org.xml.sax.SAXException { if (rdfNamespace(namespaceURI) && localName.equals("RDF")) { rdfDepth++; if (! foundDAML) { // first time if (nph) { out.println("HTTP/1.1 200 OK"); out.println("Content-type: text/html"); out.println(); } startHTML(); out.println(" <code>"); out.println(" <pre>"); out.println("<font face=\"Verdana\" size=2>"); } foundDAML = true; } if (rdfDepth == 0) return; child(); // of any parent elementStack.push(Boolean.FALSE); out.print("<<a href=" + quoted(maybeApplyPrefix(makeAbsolute(namespaceURI + localName))) + ">" + rawName + "</a>"); // attributes for (int i = 0; i < atts.getLength(); i++) { String attrLocalName = atts.getLocalName(i); String attrQName = atts.getQName(i); String value = atts.getValue(i); boolean hyperlink = (rdfAttribute(atts, i, "resource") || rdfAttribute(atts, i, "about")); boolean namespace = (attrQName.equals("xmlns") || attrQName.startsWith("xmlns:")); if (rdfAttribute(atts, i, "ID")) out.print("<a name=" + quoted(value) + " />"); if (namespace) { out.print(" " + atts.getQName(i) + "="); out.println(quoted("<a href=" + quoted(maybeApplyPrefix(value)) + ">" + value + "</a>")); } else{ out.print(" " + atts.getQName(i) + "="); if (hyperlink) out.print(quoted("<a href=" + quoted(maybeApplyPrefix(value)) + ">" + value + "</a>")); else out.print(quoted(value)); } } } public void characters(char [] ch, int start, int length) { if (rdfDepth == 0) return; child(); for (int i = 0; i < length; i++) out.print(ch[start + i]); } public void ignorableWhitespace(char [] ch, int start, int length) { // handle like text characters(ch, start, length); } public void endElement(String uri, String localName, String qName) { if (rdfDepth == 0) return; Boolean b = (Boolean) elementStack.pop(); if (b.equals(Boolean.FALSE)) out.print("/>"); else out.print("</<a href=" + quoted(maybeApplyPrefix(makeAbsolute(uri + localName))) + ">" + qName + "</a>>"); if (rdfNamespace(uri) && localName.equals("RDF")) { rdfDepth--; //out.println("<br />"); //BJP: The problem is that the HTML renderer can't handle // this classic XHTML/HTML trick. So, suppress the trick. out.println("<br>"); } } /** * redirect to the original document if it doesn't seem to contain DAML */ void maybeRedirect() { if (nph && (! foundDAML)) { out.println("HTTP/1.1 301 Redirect"); out.println("Location: " + source); out.println(); System.exit(0); } } public void endDocument() { maybeRedirect(); startHTML(); if (foundDAML) { out.println(); out.println(" </font>"); out.println(" </pre>"); out.println(" </code>"); } else { out.println(" No DAML or RDF content found."); } // out.println(" <hr />");// out.println(" <address>");// out.println(" Produced from");// out.println(" <a href=" + quoted(source) + ">" + source + "</a>");// out.println(" using");// out.println(" <a href=" + quoted("http://www.daml.org/2001/04/hyperdaml/") + ">hyperdaml</a>.java");// out.println(" </address>"); out.println(" </font>"); out.println(" </body>"); out.println("</html>"); } void printException(String label, org.xml.sax.SAXParseException e) { maybeRedirect(); startHTML(); System.err.println(label + ": " + escaped(e.toString())); } public void warning(org.xml.sax.SAXParseException e) { printException("warning", e); } public void error(org.xml.sax.SAXParseException e) { printException("recoverable error", e); } public void fatalError(org.xml.sax.SAXParseException e) { printException("fatal error", e); endDocument(); } }; xmlReader.setContentHandler(handler); xmlReader.setErrorHandler(handler); xmlReader.setProperty("http://xml.org/sax/properties/lexical-handler", new org.xml.sax.ext.LexicalHandler() { public void comment(char [] ch, int start, int length) { if (rdfDepth == 0) return; out.print("<!--"); for (int i = 0; i < length; i++) out.print(ch[start + i]); out.print("-->"); } public void endCDATA() { } public void endDTD() { } public void endEntity(String name) { } public void startCDATA() { } public void startDTD(String name, String publicId, String systemId) { } public void startEntity(String name) { } }); xmlReader.parse(new InputSource(new StringReader(rdf))); }}⌨️ 快捷键说明
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