package cz.mallat.uasparser;
import cz.mallat.uasparser.fileparser.PHPFileParser;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
/**
* The parser will download the definition file from the internet
*
* @author oli
*/
public class OnlineUpdateUASparser extends UASparser {
protected static final String DATA_RETRIVE_URL = "http://user-agent-string.info/rpc/get_data.php?key=free&format=ini";
protected static final String VERSION_CHECK_URL = "http://user-agent-string.info/rpc/get_data.php?key=free&format=ini&ver=y";
protected static final long UPDATE_INTERVAL = 1000 * 60 * 60 * 24; // 1 day
protected long lastUpdateCheck;
protected String currentVersion;
/**
* Since we've online access to the data file, we check every day for an update
*/
@Override
protected synchronized void checkDataMaps() throws IOException {
if (lastUpdateCheck == 0 || lastUpdateCheck < System.currentTimeMillis() - UPDATE_INTERVAL) {
String versionOnServer = getVersionFromServer();
if (currentVersion == null || versionOnServer.compareTo(currentVersion) > 0) {
loadDataFromInternet();
currentVersion = versionOnServer;
}
lastUpdateCheck = System.currentTimeMillis();
}
}
/**
* Loads the data file from user-agent-string.info
*
* @throws IOException
*/
private void loadDataFromInternet() throws IOException {
URL url = new URL(DATA_RETRIVE_URL);
InputStream is = url.openStream();
try {
PHPFileParser fp = new PHPFileParser(is);
createInternalDataStructre(fp.getSections());
} finally {
is.close();
}
}
/**
* Gets the current version from user-agent-string.info
*
* @return
* @throws IOException
*/
protected String getVersionFromServer() throws IOException {
URL url = new URL(VERSION_CHECK_URL);
InputStream is = url.openStream();
try {
byte[] buff = new byte[4048];
int len = is.read(buff);
return new String(buff, 0, len);
} finally {
is.close();
}
}
}