marc barbier
89 lines
2.7 KiB
Java
89 lines
2.7 KiB
Java
package downloader;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import downloader.helper.ArchiveHelper;
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import downloader.helper.HttpHelper;
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public class DatabaseVersionManager {
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private String version;
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private static final String ME = "DBUpdater";
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public DatabaseVersionManager() {
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try {
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this.version = fetchVersionFromFile();
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} catch (FileNotFoundException e) {
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this.version = null;
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}
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}
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public void updateIfNeeded() {
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String latestVersion = fetchLatestVersion();
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if( version == null || !latestVersion.equals(version) ) {
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Log.i(ME, "new dbVersion avaliable downloading...");
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downloadDatabase(latestVersion);
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} else {
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Log.i(ME, "update to Date");
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}
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}
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private void downloadDatabase(String dbVersion) {
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Log.i(ME, "fetching=" + "http://files.mcdex.net/data/mcdex-v5-" + dbVersion + ".dat.bz2");
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File archive;
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try {
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archive = HttpHelper.readFileFromUrl("http://files.mcdex.net/data/mcdex-v5-" + dbVersion + ".dat.bz2");
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} catch (MalformedURLException e) {
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Log.e(ME, "Error invalid database download url");
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System.exit(1);
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//utile pour le lint
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return;
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}
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Log.i(ME, "download finished");
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Log.i(ME, "decompressing db");
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try {
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ArchiveHelper.decompressBz2(archive, "database.dat");
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archive.delete();
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} catch (IOException e) {
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Log.e(ME, "[ERROR]cannot extract database");
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if(archive.exists()) archive.delete();
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System.exit(1);
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}
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}
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private String fetchLatestVersion() {
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try {
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return HttpHelper.readStringFromUrl("http://files.mcdex.net/data/latest.v5");
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} catch (MalformedURLException e) {
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//erreur critique il ne faut pas continuer
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e.printStackTrace();
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System.exit(1);
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}
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return null;
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}
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private static String fetchVersionFromFile() throws FileNotFoundException {
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File versionFile = new File("dbVersion");
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if( versionFile.exists()) {
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BufferedReader bfr = new BufferedReader(new FileReader(versionFile));
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try {
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String version = bfr.readLine();
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bfr.close();
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return version;
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} catch (IOException e) {
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//si on peut pas lire le fichier on le suprime
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versionFile.delete();
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return null;
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}
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} else {
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throw new FileNotFoundException();
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}
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}
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}
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