Example usage for org.jdom2.input StAXEventBuilder build

Introduction

In this page you can find the example usage for org.jdom2.input StAXEventBuilder build.

Prototype

public Document build(XMLEventReader events) throws JDOMException 

Source Link

Document

This builds a document from the supplied XMLEventReader.

Usage

From source file:org.openthinclient.jnlp.servlet.JnlpFileHandler.java

License:Open Source License

public synchronized DownloadResponse getJnlpFileEx(JnlpResource jnlpres, DownloadRequest dreq)
        throws IOException {
    String path = jnlpres.getPath();
    URL resource = jnlpres.getResource();
    long lastModified = jnlpres.getLastModified();

    _log.addDebug("lastModified: " + lastModified + " " + new Date(lastModified));
    if (lastModified == 0) {
        _log.addWarning("servlet.log.warning.nolastmodified", path);
    }/*from  w  w  w .  ja va 2  s .  c  o m*/

    // fix for 4474854:  use the request URL as key to look up jnlp file
    // in hash map
    String reqUrl = HttpUtils.getRequestURL(dreq.getHttpRequest()).toString();
    // SQE: To support query string, we changed the hash key from Request URL to (Request URL + query string)
    if (dreq.getQuery() != null)
        reqUrl += dreq.getQuery();

    // Check if entry already exist in HashMap
    JnlpFileEntry jnlpFile = (JnlpFileEntry) _jnlpFiles.get(reqUrl);

    if (jnlpFile != null && jnlpFile.getLastModified() == lastModified) {
        // Entry found in cache, so return it
        return jnlpFile.getResponse();
    }

    // Read information from WAR file
    long timeStamp = lastModified;
    String mimeType = _servletContext.getMimeType(path);
    if (mimeType == null)
        mimeType = JNLP_MIME_TYPE;

    StringBuffer jnlpFileTemplate = new StringBuffer();
    URLConnection conn = resource.openConnection();
    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
    String line = br.readLine();
    if (line != null && line.startsWith("TS:")) {
        timeStamp = parseTimeStamp(line.substring(3));
        _log.addDebug("Timestamp: " + timeStamp + " " + new Date(timeStamp));
        if (timeStamp == 0) {
            _log.addWarning("servlet.log.warning.notimestamp", path);
            timeStamp = lastModified;
        }
        line = br.readLine();
    }
    while (line != null) {
        jnlpFileTemplate.append(line);
        line = br.readLine();
    }

    String jnlpFileContent = specializeJnlpTemplate(dreq.getHttpRequest(), path, jnlpFileTemplate.toString());

    /* SQE: We need to add query string back to href in jnlp file. We also need to handle JRE requirement for
     * the test. We reconstruct the xml DOM object, modify the value, then regenerate the jnlpFileContent.
     */
    String query = dreq.getQuery();
    String testJRE = dreq.getTestJRE();
    _log.addDebug("Double check query string: " + query);
    // For backward compatibility: Always check if the href value exists.
    // Bug 4939273: We will retain the jnlp template structure and will NOT add href value. Above old
    // approach to always check href value caused some test case not run.

    // NOTE OTC:
    // This section has been rewritten:
    // - Switched from JAX to JDOM, allowing to preserve the formatting of the file
    // - regeneration based on the DOM will only be done if there are any changes to the file
    if (query != null && query.trim().length() > 0) {
        byte[] cb = jnlpFileContent.getBytes("UTF-8");

        try {

            final XMLInputFactory factory = XMLInputFactory.newFactory();
            final XMLEventReader reader = factory.createXMLEventReader(new ByteArrayInputStream(cb));

            final StAXEventBuilder builder = new StAXEventBuilder();
            final org.jdom2.Document document = builder.build(reader);

            boolean modified = false;

            final org.jdom2.Element root = document.getRootElement();

            if (root.getAttribute("href") != null) {
                String href = root.getAttribute("href").getValue();
                root.setAttribute("href", href + "?" + query);
                modified = true;
            }
            // Update version value for j2se tag
            if (testJRE != null) {
                org.jdom2.Element j2se = root.getChild("j2se");
                if (j2se != null) {
                    String ver = j2se.getAttribute("version").getValue();
                    if (ver.length() > 0) {
                        j2se.setAttribute("version", testJRE);
                        modified = true;
                    }
                }
            }

            if (modified) {
                // we're only regenerating only if there have been any changes.
                final XMLOutputter outputter = new XMLOutputter();
                final StringWriter sw = new StringWriter();
                outputter.output(document, sw);
                jnlpFileContent = sw.toString();
            }

            _log.addDebug("Converted jnlpFileContent: " + jnlpFileContent);
            // Since we modified the file on the fly, we always update the timestamp value with current time
            if (modified) {
                timeStamp = new Date().getTime();
                _log.addDebug("Last modified on the fly:  " + timeStamp);
            }
        } catch (Exception e) {
            _log.addDebug(e.toString(), e);
        }

    }

    // Convert to bytes as a UTF-8 encoding
    byte[] byteContent = jnlpFileContent.getBytes("UTF-8");

    // Create entry
    DownloadResponse resp = DownloadResponse.getFileDownloadResponse(byteContent, mimeType, timeStamp,
            jnlpres.getReturnVersionId());
    jnlpFile = new JnlpFileEntry(resp, lastModified);
    _jnlpFiles.put(reqUrl, jnlpFile);

    return resp;
}

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