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varun.gupt |
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package in.shop2020.web;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.Map;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.json.JSONObject;
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import com.google.appengine.api.datastore.DatastoreServiceFactory;
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import com.google.appengine.api.datastore.DatastoreService;
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import com.google.appengine.api.datastore.Entity;
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import com.google.appengine.api.datastore.EntityNotFoundException;
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import com.google.appengine.api.datastore.Key;
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import com.google.appengine.api.datastore.KeyFactory;
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import com.google.appengine.api.datastore.PreparedQuery;
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import com.google.appengine.api.datastore.Query;
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import com.google.appengine.api.datastore.Query.FilterOperator;
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public class MyNotesServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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private static final String ENTITY_KIND = "UserNote";
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public void doPost(HttpServletRequest req, HttpServletResponse resp) {
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String user = req.getParameter("user");
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String entity = req.getParameter("entity");
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String slide = req.getParameter("slide");
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String noteText = req.getParameter("note");
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String keyName = "";
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DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
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if (user == null || entity == null || user.isEmpty() || entity.isEmpty()) {
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return;
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}
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keyName = user + "-" + entity + "-" + slide;
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Key key = KeyFactory.createKey(ENTITY_KIND, keyName);
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Entity note;
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try {
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note = datastore.get(key); // Note exists
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note.setProperty("note", noteText);
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datastore.put(note);
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} catch (EntityNotFoundException enf) { // Note does not exist
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try {
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long userId = Long.parseLong(user);
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long entityId = Long.parseLong(entity);
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note = new Entity(ENTITY_KIND, keyName);
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note.setProperty("userId", userId);
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note.setProperty("entityId", entityId);
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note.setProperty("slide", slide);
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note.setProperty("note", noteText);
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datastore.put(note);
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} catch (NumberFormatException nfe) {
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System.out.println("Not able to convert user id or entity id from string to long.");
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}
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}
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}
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public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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resp.setContentType("application/json");
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try {
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long userId = Long.parseLong(req.getParameter("user"));
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long entityId = Long.parseLong(req.getParameter("entity"));
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Query q = new Query(ENTITY_KIND);
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q.addFilter("userId", FilterOperator.EQUAL , userId);
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q.addFilter("entityId", FilterOperator.EQUAL, entityId);
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DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
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PreparedQuery pq = datastore.prepare(q);
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Map<String, String> notes = new HashMap<String, String>();
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for(Entity result: pq.asIterable()) {
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notes.put((String) result.getProperty("slide"), (String) result.getProperty("note"));
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}
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resp.getWriter().print(new JSONObject(notes));
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} catch (NumberFormatException e) {
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System.out.println("Not able to convert user id or entity id from string to long.");
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} catch (IOException e) {
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System.out.println("Unable to write on output stream");
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}
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}
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}
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