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package lq;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.jdo.PersistenceManager;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.logging.Logger;
public class ImportQuotes extends HttpServlet {
private static final Logger logger = Logger.getLogger(ImportQuotes.class.getName());
// hacks....
private HashMap<Long, Quote> quoteCache;
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
quoteCache = new HashMap<Long, Quote>();
String path = "db-dump.xml";
resp.setContentType("text/plain");
resp.getWriter().println("Trying to import quotes from " + path);
SAXBuilder builder = new SAXBuilder();
try {
Document document = builder.build(path);
Element root = document.getRootElement();
List quoteRows = XPath.selectNodes(root,
"//table_data[@name='quotes']/*");
List voteRows = XPath.selectNodes(root,
"//table_data[@name='votes']/*");
List<Quote> quotes = importQuotes(quoteRows);
List<Vote> votes = importVotes(voteRows);
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
String importIdString = req.getParameter("importId");
if (importIdString == null) {
uploadInChunks(pm, votes, 100);
uploadInChunks(pm, quotes, 100);
resp.getWriter().println("Import finished.");
}
else {
int importId = Integer.parseInt(importIdString);
Quote q = quotes.get(importId);
pm.makePersistent(q);
for (Vote v : votes) {
if (v.getQuoteId() == q.getId()) {
pm.makePersistent(v);
}
}
resp.getWriter().println("There are " + quotes.size() +
" quotes in the old db.");
resp.getWriter().println("Quote " + importId + " imported.");
}
}
finally {
pm.close();
}
} catch (Exception e) {
e.printStackTrace(resp.getWriter());
}
}
private void uploadInChunks(PersistenceManager pm, List<?> objects, int chunkSize) {
for (int i = 0; i < objects.size(); i += chunkSize) {
List<Object> chunk = new ArrayList<Object>();
for (int j = i; j < Math.min(objects.size(), i + chunkSize); j++) {
chunk.add(objects.get(j));
}
pm.makePersistentAll(chunk);
}
}
private List<Quote> importQuotes(List quoteRows) throws Exception {
List<Quote> quotes = new ArrayList<Quote>();
for (Object row : quoteRows) {
@SuppressWarnings("unchecked")
Element elem = (Element) row;
quotes.add(importQuote(elem));
}
logger.info("Imported " + quotes.size() + " quotes");
return quotes;
}
private Quote importQuote(Element quoteRow) throws Exception {
Long oldId = Long.parseLong(getChildWithName("id", quoteRow));
Long id = Long.parseLong(getChildWithName("number", quoteRow));
String approvedString = getChildWithName("approved", quoteRow);
Boolean approved = approvedString.equals("1") ? true : false;
String name = getChildWithName("name", quoteRow);
String dateString = getChildWithName("date", quoteRow);
Date date = DateUtil.dateFormat.parse(dateString);
String content = getChildWithName("text", quoteRow);
String timeString = getChildWithName("time", quoteRow);
Date timestamp = DateUtil.timestampFormat.parse(timeString);
String ip = getChildWithName("ip", quoteRow);
Quote quote = new Quote(date, name, content, ip);
quote.setId(id);
quote.setTimestamp(timestamp);
quote.setApproved(approved);
quoteCache.put(oldId, quote);
return quote;
}
private List<Vote> importVotes(List voteRows) throws Exception {
List<Vote> votes = new ArrayList<Vote>();
for (Object row : voteRows) {
@SuppressWarnings("unchecked")
Element elem = (Element) row;
Vote vote = importVote(elem);
if (vote != null) {
votes.add(vote);
}
}
logger.info("Imported " + votes.size() + " votes");
return votes;
}
private Vote importVote(Element voteRow) throws Exception {
Long quoteId = Long.parseLong(getChildWithName("id", voteRow));
Quote quote = quoteCache.get(quoteId);
if (quote == null) {
logger.warning("Could not find quote with id " + quoteId);
return null;
}
Long rating = Long.parseLong(getChildWithName("vote", voteRow));
Date timestamp = lq.DateUtil.timestampFormat.parse(getChildWithName("time", voteRow));
String ip = getChildWithName("ip", voteRow);
Vote vote = new Vote(quoteId, rating, ip);
vote.setTimestamp(timestamp);
QuoteUtil.addVote(quote, vote);
return vote;
}
private String getChildWithName(String name, Element parent) throws Exception {
String xpath = "field[@name='" + name + "']";
Element child = (Element) XPath.selectSingleNode(parent, xpath);
return child.getValue();
}
}
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