90 lines
2.8 KiB
Java
90 lines
2.8 KiB
Java
/*
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* This file is part of fabric-loom, licensed under the MIT License (MIT).
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*
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* Copyright (c) 2016-2021 FabricMC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package net.fabricmc.loom.util;
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import java.io.IOException;
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import java.nio.file.FileSystems;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.StandardWatchEventKinds;
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import java.nio.file.WatchEvent;
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import java.nio.file.WatchKey;
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import java.nio.file.WatchService;
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import java.util.HashMap;
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import java.util.Map;
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public final class StaticPathWatcher {
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public static final StaticPathWatcher INSTANCE = new StaticPathWatcher();
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private final Map<Path, Boolean> changeCache = new HashMap<>();
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private final WatchService service;
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private final Map<Path, WatchKey> pathsObserved = new HashMap<>();
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private StaticPathWatcher() {
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try {
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service = FileSystems.getDefault().newWatchService();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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public boolean hasFileChanged(Path filePath) {
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if (!Files.exists(filePath)) {
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return true;
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}
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WatchKey key;
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while ((key = service.poll()) != null) {
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for (WatchEvent<?> event : key.pollEvents()) {
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Object ctx = event.context();
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if (ctx instanceof Path path) {
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changeCache.put(path.toAbsolutePath(), true);
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}
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}
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}
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filePath = filePath.toAbsolutePath();
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Path parentPath = filePath.getParent();
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if (changeCache.containsKey(filePath)) {
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return true;
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} else {
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if (!pathsObserved.containsKey(parentPath)) {
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try {
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pathsObserved.put(parentPath, parentPath.register(service, StandardWatchEventKinds.ENTRY_MODIFY, StandardWatchEventKinds.ENTRY_DELETE));
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return true;
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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} else {
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return false;
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}
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}
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}
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}
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