/**
* This method stores an xml document given as an org.w3c.dom.Document to the database giving it
* an indentifier. If the identifier provided is null, then the database generates a unique
* identifier on its own.
*
* @param doc The dom represntation of the document to be stored as an org.w3c.dom.Document.
* @param resourceId The resourceId to give to the document as a unique identifier within the
* database. If null a unique identifier is automatically generated.
* @param collection The name of the collection to store the document under. If it does not exist,
* it is created.
* @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.
*/
public void storeDomDocument(
Document doc, String resourceId, String collection, String username, String password) {
try {
// initialize driver
Class cl = Class.forName(_driver);
Database database = (Database) cl.newInstance();
DatabaseManager.registerDatabase(database);
// try to get collection
Collection col = DatabaseManager.getCollection(_URI + collection, username, password);
if (col == null) {
// collection does not exist: get root collection and create
// for simplicity, we assume that the new collection is a
// direct child of the root collection, e.g. /db/test.
// the example will fail otherwise.
Collection root = DatabaseManager.getCollection(_URI + "/db");
CollectionManagementService mgtService =
(CollectionManagementService) root.getService("CollectionManagementService", "1.0");
col = mgtService.createCollection(collection.substring("/db".length()));
}
// create new XMLResource; an id will be assigned to the new resource
XMLResource document = (XMLResource) col.createResource(resourceId, "XMLResource");
document.setContentAsDOM(doc.getDocumentElement());
col.storeResource(document);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 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;
}
/**
* This method performs an XPath query to the database and returns the results as a Vector of
* Strings.
*
* @param collection The name of the collection to look for the document.
* @param query A string containing an XPath expression which shall act as a query against the
* database.
* @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 A Vector containing the answers to the query as Strings.
*/
public Vector query(String collection, String query, String username, String password) {
Vector response = new Vector();
try {
Class cl = Class.forName(_driver);
Database database = (Database) cl.newInstance();
DatabaseManager.registerDatabase(database);
Collection col = DatabaseManager.getCollection(_URI + collection, username, password);
XPathQueryService service = (XPathQueryService) col.getService("XPathQueryService", "1.0");
service.setProperty("indent", "yes");
ResourceSet result = service.query(query);
ResourceIterator i = result.getIterator();
while (i.hasMoreResources()) {
Resource r = i.nextResource();
response.add((String) r.getContent());
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
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();
}
}