conversations-classic/src/main/java/eu/siacs/conversations/utils/ConversationsFileObserver.java
Daniel Gultsch 676d31f606 initial work toward api 26+
* introduce notification channels
* always use foreground service on 26+
2018-09-05 21:37:12 +02:00

105 lines
2.8 KiB
Java

package eu.siacs.conversations.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 eu.siacs.conversations.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<>();
protected ConversationsFileObserver(String path) {
this.path = path;
}
public synchronized void startWatching() {
Stack<String> stack = new Stack<>();
stack.push(path);
while (!stack.empty()) {
String parent = stack.pop();
mObservers.add(new SingleFileObserver(parent, FileObserver.DELETE| FileObserver.MOVED_FROM));
final File path = new File(parent);
final File[] files = path.listFiles();
if (files == null) {
continue;
}
for(File file : files) {
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 synchronized void stopWatching() {
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);
}
}
}