protected void prepareHTMLView(InputStream older, InputStream newer) throws Exception {
InputSource oldSource = new InputSource(older);
InputSource newSource = new InputSource(newer);
HtmlCleaner cleaner = new HtmlCleaner();
Locale locale = Locale.getDefault();
String prefix = "diff";
DomTreeBuilder oldHandler;
DomTreeBuilder newHandler;
try {
oldHandler = new DomTreeBuilder();
cleaner.cleanAndParse(oldSource, oldHandler);
newHandler = new DomTreeBuilder();
cleaner.cleanAndParse(newSource, newHandler);
} catch (Exception e) {
throw new UsecaseException("Error while parsing document for diffing: ", e);
}
TextNodeComparator leftComparator = new TextNodeComparator(oldHandler, locale);
TextNodeComparator rightComparator = new TextNodeComparator(newHandler, locale);
SAXTransformerFactory tf = (SAXTransformerFactory) TransformerFactory.newInstance();
TransformerHandler result = tf.newTransformerHandler();
ByteArrayOutputStream out = new ByteArrayOutputStream();
Result domResult = new StreamResult(out);
result.setResult(domResult);
ContentHandler htmlDiff = result;
// Document content filtering
// XslFilter filter = new XslFilter();
// ContentHandler postProcess = filter.xsl(result, "htmldiff.xsl");
try {
startDiffDocument(htmlDiff);
SimpleDiffOutput output = new SimpleDiffOutput(htmlDiff, prefix);
BodyNode diffNode = HTMLDiffer.diff(leftComparator, rightComparator);
output.toHTML(diffNode);
finishDiffDocument(htmlDiff);
setParameter(
"html-output",
DocumentBuilderFactory.newInstance()
.newDocumentBuilder()
.parse(new ByteArrayInputStream(out.toByteArray())));
} catch (Exception e) {
throw new UsecaseException("Failed translating diff document to xml: ", e);
}
}
public void handle(
String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html;charset=utf-8");
response.setStatus(HttpServletResponse.SC_OK);
baseRequest.setHandled(true);
boolean htmlOut = false;
try {
String oldString = request.getParameter("old");
String newString = request.getParameter("new");
if (oldString == null || newString == null) {
return;
}
InputStream oldStream = new ByteArrayInputStream(oldString.getBytes());
InputStream newStream = new ByteArrayInputStream(newString.getBytes());
SAXTransformerFactory tf = (SAXTransformerFactory) TransformerFactory.newInstance();
TransformerHandler result = tf.newTransformerHandler();
result.setResult(new StreamResult(response.getOutputStream()));
String[] css = new String[] {};
XslFilter filter = new XslFilter();
ContentHandler postProcess = htmlOut ? filter.xsl(result, "diff.xsl") : result;
Locale locale = Locale.getDefault();
String prefix = "diff";
HtmlCleaner cleaner = new HtmlCleaner();
DomTreeBuilder oldHandler = new DomTreeBuilder();
InputSource oldSource = new InputSource(oldStream);
oldSource.setEncoding("UTF-8");
InputSource newSource = new InputSource(newStream);
newSource.setEncoding("UTF-8");
cleaner.cleanAndParse(oldSource, oldHandler);
TextNodeComparator leftComparator = new TextNodeComparator(oldHandler, locale);
DomTreeBuilder newHandler = new DomTreeBuilder();
cleaner.cleanAndParse(newSource, newHandler);
TextNodeComparator rightComparator = new TextNodeComparator(newHandler, locale);
postProcess.startDocument();
postProcess.startElement("", "div", "div", new AttributesImpl());
doCSS(css, postProcess);
postProcess.startElement("", "diff", "diff", new AttributesImpl());
HtmlSaxDiffOutput output = new HtmlSaxDiffOutput(postProcess, prefix);
HTMLDiffer differ = new HTMLDiffer(output);
differ.diff(leftComparator, rightComparator);
postProcess.endElement("", "diff", "diff");
postProcess.endElement("", "div", "div");
postProcess.endDocument();
} catch (Throwable e) {
e.printStackTrace();
if (e.getCause() != null) {
e.getCause().printStackTrace();
}
if (e instanceof SAXException) {
((SAXException) e).getException().printStackTrace();
}
}
}
