/**
* This method retrieves an xml document from the database based on its resource identifier. The
* document is returned as an org.w3c.dom.Document.
*
* @param collection The name of the collection to look for the document.
* @param resourceId The resource identifier of the document to be retrieved.
* @param username The identifier of the user calling the method used for authentication.
* @param password The password of the user calling the method used for authentication.
* @return The xml document retrieved as an org.w3c.dom.Document.
*/
public Document retrieveDocument(
String collection, String resourceId, String username, String password) {
Document doc = null;
try {
// initialize database driver
Class cl = Class.forName(_driver);
Database database = (Database) cl.newInstance();
DatabaseManager.registerDatabase(database);
// get the collection
Collection col = DatabaseManager.getCollection(_URI + collection, username, password);
col.setProperty(OutputKeys.INDENT, "no");
XMLResource res = (XMLResource) col.getResource(resourceId);
if (res == null) System.out.println("document not found!");
else {
doc = (Document) (res.getContentAsDOM()).getOwnerDocument();
}
} catch (Exception e) {
e.printStackTrace();
}
return doc;
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
// Identify Sources
String path = getServletContext().getRealPath("/WEB-INF/");
String XMLFileName = path + "/Home.xml";
String XSLFileName = path + "/Home.xsl";
StreamSource XMLSource = new StreamSource(XMLFileName);
StreamSource XSLSource = new StreamSource(XSLFileName);
String URI = "xmldb:exist://localhost:8444/exist/xmlrpc";
String driver = "org.exist.xmldb.DatabaseImpl";
XMLResource res = null;
Node resNode = null;
Document doc = null;
try {
Class cl = Class.forName(driver);
Database database = (Database) cl.newInstance();
DatabaseManager.registerDatabase(database);
// get the collection
Collection col =
DatabaseManager.getCollection(URI + "/db/AnswerQuest", "admin", "password");
col.setProperty(OutputKeys.INDENT, "no");
res = (XMLResource) col.getResource("Home.xml");
resNode = res.getContentAsDOM();
doc = (Document) resNode;
} catch (Exception e) {
System.err.println("Error Document: " + e.getMessage());
}
DOMSource origDocSource = new DOMSource(doc);
// Identify Result
StreamResult homeOutput = new StreamResult(out);
// Create TransformerFactory
TransformerFactory xFactory = TransformerFactory.newInstance();
// Create Transformer
Transformer optimusPrime = xFactory.newTransformer(XSLSource);
// Apply transform
optimusPrime.transform(XMLSource, homeOutput);
} catch (TransformerConfigurationException ex) {
System.out.println("Encountered TransformerConfiguration Error: " + ex.getMessage());
} catch (TransformerException ex) {
System.out.println("Encountered Transformer Error: " + ex.getMessage());
} finally {
out.close();
}
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String URI = "xmldb:exist://localhost:8444/exist/xmlrpc";
String driver = "org.exist.xmldb.DatabaseImpl";
XMLResource res = null;
Node resNode = null;
Document doc = null;
String path = getServletContext().getRealPath("/");
String XSLFileName = path + "/Slideshow.xsl";
File XslFile = new File(XSLFileName);
String name;
String rating;
try {
name = request.getParameter("name");
rating = request.getParameter("rating");
if (name == null) {
name = "";
}
if (rating == null) {
rating = "";
}
} catch (Exception e) {
name = "";
rating = "";
}
try {
Class cl = Class.forName(driver);
Database database = (Database) cl.newInstance();
DatabaseManager.registerDatabase(database);
// get the collection
Collection col = DatabaseManager.getCollection(URI + "/db/Project", "admin", "password");
XQueryService service = (XQueryService) col.getService("XQueryService", "1.0");
XQueryService another = (XQueryService) col.getService("XQueryService", "1.0");
service.setProperty("indent", "yes");
another.setProperty("indent", "yes");
String queryString = "";
if (!(rating.equals(""))) {
service.declareVariable("rating", "");
queryString =
"for $rating in //app//name[text()='"
+ name
+ "']/../rating "
+ "return update replace $rating with <rating>"
+ rating
+ "</rating>";
service.query(queryString);
}
col.setProperty(OutputKeys.INDENT, "no");
res = (XMLResource) col.getResource("Review.xml");
resNode = res.getContentAsDOM();
doc = (Document) resNode;
} catch (Exception e) {
System.err.println("Error Document: " + e.getMessage());
}
DOMSource origDocSource = new DOMSource(doc);
try {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
StreamSource stylesheet = new StreamSource(XslFile);
Transformer transformer = transformerFactory.newTransformer(stylesheet);
NodeList appNodes = doc.getElementsByTagName("name");
int numEvent = appNodes.getLength();
String prev;
String next;
for (int i = 0; i < numEvent; i++) {
Node eventNode = appNodes.item(i);
NodeList eventNodeListChildren = eventNode.getChildNodes();
Node eventTextNode = eventNodeListChildren.item(0);
String appname = eventTextNode.getNodeValue();
if (name.equals(appname)) {
if (i != 0) {
prev = appNodes.item(i - 1).getChildNodes().item(0).getNodeValue();
} else {
prev = appNodes.item(numEvent - 1).getChildNodes().item(0).getNodeValue();
}
if (i != (numEvent - 1)) {
next = appNodes.item(i + 1).getChildNodes().item(0).getNodeValue();
} else {
next = appNodes.item(0).getChildNodes().item(0).getNodeValue();
}
transformer.setParameter("app_name", appname);
transformer.setParameter("prev_name", prev);
transformer.setParameter("next_name", next);
transformer.transform(origDocSource, new StreamResult(out));
}
}
} catch (Exception e) {
out.println("Exception transformation :" + e.getMessage());
e.printStackTrace(out);
} finally {
out.close();
}
}
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (request.getCharacterEncoding() == null)
try {
request.setCharacterEncoding("UTF-8");
} catch (final IllegalStateException e) {
}
// Try to find the XQuery
final String qpath = getServletContext().getRealPath(query);
final File f = new File(qpath);
if (!(f.canRead() && f.isFile())) {
throw new ServletException("Cannot read XQuery source from " + f.getAbsolutePath());
}
final FileSource source = new FileSource(f, "UTF-8", true);
try {
// Prepare and execute the XQuery
final Collection collection =
DatabaseManager.getCollection(collectionURI.toString(), user, password);
final XQueryService service = (XQueryService) collection.getService("XQueryService", "1.0");
if (!((CollectionImpl) collection).isRemoteCollection()) {
service.declareVariable(
RequestModule.PREFIX + ":request", new HttpRequestWrapper(request, "UTF-8", "UTF-8"));
service.declareVariable(
ResponseModule.PREFIX + ":response", new HttpResponseWrapper(response));
service.declareVariable(
SessionModule.PREFIX + ":session", new HttpSessionWrapper(request.getSession(false)));
}
final ResourceSet result = service.execute(source);
String redirectTo = null;
String servletName = null;
String path = null;
RequestWrapper modifiedRequest = null;
// parse the query result element
if (result.getSize() == 1) {
final XMLResource resource = (XMLResource) result.getResource(0);
Node node = resource.getContentAsDOM();
if (node.getNodeType() == Node.DOCUMENT_NODE) {
node = ((Document) node).getDocumentElement();
}
if (node.getNodeType() != Node.ELEMENT_NODE) {
response.sendError(
HttpServletResponse.SC_BAD_REQUEST,
"Redirect XQuery should return an XML element. Received: " + resource.getContent());
return;
}
Element elem = (Element) node;
if (!(Namespaces.EXIST_NS.equals(elem.getNamespaceURI())
&& "dispatch".equals(elem.getLocalName()))) {
response.sendError(
HttpServletResponse.SC_BAD_REQUEST,
"Redirect XQuery should return an element <exist:dispatch>. Received: "
+ resource.getContent());
return;
}
if (elem.hasAttribute("path")) {
path = elem.getAttribute("path");
} else if (elem.hasAttribute("servlet-name")) {
servletName = elem.getAttribute("servlet-name");
} else if (elem.hasAttribute("redirect")) {
redirectTo = elem.getAttribute("redirect");
} else {
response.sendError(
HttpServletResponse.SC_BAD_REQUEST,
"Element <exist:dispatch> should either provide an attribute 'path' or 'servlet-name'. Received: "
+ resource.getContent());
return;
}
// Check for add-parameter elements etc.
if (elem.hasChildNodes()) {
node = elem.getFirstChild();
while (node != null) {
if (node.getNodeType() == Node.ELEMENT_NODE
&& Namespaces.EXIST_NS.equals(node.getNamespaceURI())) {
elem = (Element) node;
if ("add-parameter".equals(elem.getLocalName())) {
if (modifiedRequest == null) {
modifiedRequest = new RequestWrapper(request);
}
modifiedRequest.addParameter(elem.getAttribute("name"), elem.getAttribute("value"));
}
}
node = node.getNextSibling();
}
}
}
if (redirectTo != null) {
// directly redirect to the specified URI
response.sendRedirect(redirectTo);
return;
}
// Get a RequestDispatcher, either from the servlet context or the request
RequestDispatcher dispatcher;
if (servletName != null && servletName.length() > 0) {
dispatcher = getServletContext().getNamedDispatcher(servletName);
} else {
LOG.debug("Dispatching to " + path);
dispatcher = getServletContext().getRequestDispatcher(path);
if (dispatcher == null) {
dispatcher = request.getRequestDispatcher(path);
}
}
if (dispatcher == null) {
response.sendError(
HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
"Could not create a request dispatcher. Giving up.");
return;
}
if (modifiedRequest != null) {
request = modifiedRequest;
}
// store the original request URI to org.exist.forward.request-uri
request.setAttribute("org.exist.forward.request-uri", request.getRequestURI());
request.setAttribute("org.exist.forward.servlet-path", request.getServletPath());
// finally, execute the forward
dispatcher.forward(request, response);
} catch (final XMLDBException e) {
throw new ServletException(
"An error occurred while initializing RedirectorServlet: " + e.getMessage(), e);
}
}