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package de.luhmer.owncloudnewsreader.async_tasks;
import android.content.Context;
import android.database.DataSetObserver;
import android.os.AsyncTask;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import de.luhmer.owncloudnewsreader.view.ChangeLogFileListView;
/**
* Downloads the owncloud news reader changelog from github, transforms it into xml
* and saves it as tempfile. This xml tempfile can be used for changeloglib library.
*/
public class DownloadChangelogTask extends AsyncTask<Void, Void, String> {
@SuppressWarnings("unused")
private static final String TAG = "DownloadChangelogTask";
private static final String README_URL = "https://raw.githubusercontent.com/nextcloud/news-android/master/CHANGELOG.md";
private static final String FILE_NAME = "changelog.xml";
private Context mContext;
private ChangeLogFileListView mChangelogView;
private Listener mListener;
private IOException exception;
/**
* @param context
* @param changelogView this list view will be automatically filled when
* downloading and saving has finished
* @param listener called when task has finished or errors have been raised
*/
public DownloadChangelogTask(Context context,
ChangeLogFileListView changelogView,
Listener listener) {
mContext = context;
mChangelogView = changelogView;
mListener = listener;
}
@Override
protected String doInBackground(Void... params) {
String path = null;
try {
ArrayList<String> changelogArr = downloadReadme();
String xml = convertToXML(changelogArr);
path = saveToTempFile(xml, FILE_NAME);
} catch (IOException e) {
exception = e;
}
return path;
}
@Override
protected void onPostExecute(String filePath) {
if (exception != null) {
mListener.onError(exception);
return;
}
mChangelogView.loadFile(filePath);
mChangelogView.getAdapter().registerDataSetObserver(new DataSetObserver() {
@Override
public void onChanged() {
mListener.onSuccess();
}
});
}
private ArrayList<String> downloadReadme() throws IOException {
ArrayList<String> changelogArr = new ArrayList<>();
URL url = new URL(README_URL);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
InputStream isTemp = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader in = new BufferedReader(new InputStreamReader(isTemp));
String inputLine;
while ((inputLine = in.readLine()) != null) {
changelogArr.add(inputLine.replace("<", "[").replace(">", "]"));
}
in.close();
} finally {
urlConnection.disconnect();
}
return changelogArr;
}
private String convertToXML(ArrayList<String> changelogArr) {
changelogArr.add("");
// create xml nodes
StringBuilder builder = new StringBuilder();
builder.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
builder.append("<changelog bulletedList=\"true\">");
boolean versionStarted = false;
for (String line : changelogArr) {
if (line.startsWith("- ")) {
// change entry
builder.append("<changelogtext>");
builder.append(line.substring(2).trim());
builder.append("</changelogtext>");
} else if (line.equals("")) {
// version end
if (versionStarted) {
versionStarted = false;
builder.append("</changelogversion>");
}
} else if (!line.contains("---------------------")) {
// version start
versionStarted = true;
builder.append("<changelogversion versionName=\"" + line + "\">");
}
}
builder.append("</changelog>");
return builder.toString();
}
private String saveToTempFile(String content, String fileName) throws IOException {
File file = File.createTempFile(fileName, null, mContext.getCacheDir());
BufferedWriter out = new BufferedWriter(new FileWriter(file));
try {
out.write(content);
} finally {
out.close();
}
return "file://" + file.getAbsolutePath();
}
public interface Listener {
/**
* Called when ChangeLogFileListView instance has successfully been updated.
*/
void onSuccess();
/**
* Called when some error has been thrown during download, parsing or saving.
*/
void onError(IOException e);
}
}
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