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package com.mapbox.mapboxsdk.utils;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import com.mapbox.mapboxsdk.log.Logger;
import java.io.File;
public class FileUtils {
private static final String TAG = "Mbgl-FileUtils";
/**
* Task checking whether app's process can read a file.
* <p>
* The callback reference is <b>strongly kept</b> throughout the process,
* so it needs to be wrapped in a weak reference or released on the client side if necessary.
*/
public static class CheckFileReadPermissionTask extends AsyncTask<File, Void, Boolean> {
@NonNull
private final OnCheckFileReadPermissionListener listener;
public CheckFileReadPermissionTask(@NonNull OnCheckFileReadPermissionListener listener) {
this.listener = listener;
}
@Override
protected Boolean doInBackground(File... files) {
try {
return files[0].canRead();
} catch (Exception ex) {
return false;
}
}
@Override
protected void onCancelled() {
listener.onError();
}
@Override
protected void onPostExecute(Boolean result) {
if (result) {
listener.onReadPermissionGranted();
} else {
listener.onError();
}
}
}
/**
* Interface definition for a callback invoked when checking file's read permissions.
*/
public interface OnCheckFileReadPermissionListener {
/**
* Invoked when app's process has a permission to read a file.
*/
void onReadPermissionGranted();
/**
* Invoked when app's process doesn't have a permission to read a file or an error occurs.
*/
void onError();
}
/**
* Task checking whether app's process can write to a file.
* <p>
* The callback reference is <b>strongly kept</b> throughout the process,
* so it needs to be wrapped in a weak reference or released on the client side if necessary.
*/
public static class CheckFileWritePermissionTask extends AsyncTask<File, Void, Boolean> {
@NonNull
private final OnCheckFileWritePermissionListener listener;
public CheckFileWritePermissionTask(@NonNull OnCheckFileWritePermissionListener listener) {
this.listener = listener;
}
@Override
protected Boolean doInBackground(File... files) {
try {
return files[0].canWrite();
} catch (Exception ex) {
return false;
}
}
@Override
protected void onCancelled() {
listener.onError();
}
@Override
protected void onPostExecute(Boolean result) {
if (result) {
listener.onWritePermissionGranted();
} else {
listener.onError();
}
}
}
/**
* Interface definition for a callback invoked when checking file's write permissions.
*/
public interface OnCheckFileWritePermissionListener {
/**
* Invoked when app's process has a permission to write to a file.
*/
void onWritePermissionGranted();
/**
* Invoked when app's process doesn't have a permission to write to a file or an error occurs.
*/
void onError();
}
/**
* Deletes a file asynchronously in a separate thread.
*
* @param path the path of the file that should be deleted
*/
public static void deleteFile(@NonNull final String path) {
// Delete the file in a separate thread to avoid affecting the UI
new Thread(new Runnable() {
@Override
public void run() {
try {
File file = new File(path);
if (file.exists()) {
if (file.delete()) {
Logger.d(TAG, "File deleted to save space: " + path);
} else {
Logger.e(TAG, "Failed to delete file: " + path);
}
}
} catch (Exception exception) {
Logger.e(TAG, "Failed to delete file: ", exception);
}
}
}).start();
}
}
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