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