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package de.pixart.messenger.utils;
import android.os.FileObserver;
import android.util.Log;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import java.util.concurrent.atomic.AtomicBoolean;
import de.pixart.messenger.Config;
/**
* Copyright (C) 2012 Bartek Przybylski
* Copyright (C) 2015 ownCloud Inc.
* Copyright (C) 2016 Daniel Gultsch
*/
public abstract class ConversationsFileObserver {
private final String path;
private final List<SingleFileObserver> mObservers = new ArrayList<>();
private final AtomicBoolean shouldStop = new AtomicBoolean(true);
protected ConversationsFileObserver(String path) {
this.path = path;
}
public void startWatching() {
shouldStop.set(false);
startWatchingInternal();
}
private synchronized void startWatchingInternal() {
Stack<String> stack = new Stack<>();
stack.push(path);
while (!stack.empty()) {
if (shouldStop.get()) {
Log.d(Config.LOGTAG, "file observer received command to stop");
return;
}
String parent = stack.pop();
mObservers.add(new SingleFileObserver(parent, FileObserver.DELETE | FileObserver.MOVED_FROM));
final File path = new File(parent);
File[] files = new File[0];
try {
files = path.listFiles();
} catch (OutOfMemoryError e) {
e.printStackTrace();
}
if (files == null) {
continue;
}
for (File file : files) {
if (shouldStop.get()) {
Log.d(Config.LOGTAG, "file observer received command to stop");
return;
}
if (file.isDirectory() && file.getName().charAt(0) != '.') {
final String currentPath = file.getAbsolutePath();
if (depth(file) <= 8 && !stack.contains(currentPath) && !observing(currentPath)) {
stack.push(currentPath);
}
}
}
}
for (FileObserver observer : mObservers) {
observer.startWatching();
}
}
private static int depth(File file) {
int depth = 0;
while ((file = file.getParentFile()) != null) {
depth++;
}
return depth;
}
private boolean observing(String path) {
for (SingleFileObserver observer : mObservers) {
if (path.equals(observer.path)) {
return true;
}
}
return false;
}
public void stopWatching() {
shouldStop.set(true);
stopWatchingInternal();
}
private synchronized void stopWatchingInternal() {
for (FileObserver observer : mObservers) {
observer.stopWatching();
}
mObservers.clear();
}
abstract public void onEvent(int event, String path);
public void restartWatching() {
stopWatching();
startWatching();
}
private class SingleFileObserver extends FileObserver {
private final String path;
SingleFileObserver(String path, int mask) {
super(path, mask);
this.path = path;
}
@Override
public void onEvent(int event, String filename) {
if (filename == null) {
Log.d(Config.LOGTAG, "ignored file event with NULL filename (event=" + event + ")");
return;
}
ConversationsFileObserver.this.onEvent(event, path + '/' + filename);
}
}
}
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