com.xiaoleilu.hutool.io.watch.watchers.WatcherChain Maven / Gradle / Ivy

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package com.xiaoleilu.hutool.io.watch.watchers;

import java.nio.file.Path;
import java.nio.file.WatchEvent;
import java.util.Iterator;
import java.util.List;

import com.xiaoleilu.hutool.collection.CollectionUtil;
import com.xiaoleilu.hutool.io.watch.Watcher;
import com.xiaoleilu.hutool.lang.Chain;

/**
 * 观察者链

 * 用于加入多个观察者
 * 
 * @author Looly
 * @since 3.1.0
 */
public class WatcherChain implements Watcher, Chain{

	/** 观察者列表 */
	final private List chain;
	
	/**
	 * 创建观察者链{@link WatcherChain}
	 * @param watchers  观察者列表
	 * @return {@link WatcherChain}
	 */
	public static WatcherChain create(Watcher... watchers) {
		return new WatcherChain(watchers);
	}
	
	/**
	 * 构造
	 * @param watchers 观察者列表
	 */
	public WatcherChain(Watcher... watchers) {
		chain = CollectionUtil.newArrayList(watchers);
	}
	
	@Override
	public void onCreate(WatchEvent event, Path currentPath) {
		for (Watcher watcher : chain) {
			watcher.onCreate(event, currentPath);
		}
	}

	@Override
	public void onModify(WatchEvent event, Path currentPath) {
		for (Watcher watcher : chain) {
			watcher.onModify(event, currentPath);
		}
	}

	@Override
	public void onDelete(WatchEvent event, Path currentPath) {
		for (Watcher watcher : chain) {
			watcher.onDelete(event, currentPath);
		}
	}

	@Override
	public void onOverflow(WatchEvent event, Path currentPath) {
		for (Watcher watcher : chain) {
			watcher.onOverflow(event, currentPath);
		}
	}

	@Override
	public Iterator iterator() {
		return this.chain.iterator();
	}

	@Override
	public WatcherChain addChain(Watcher element) {
		this.chain.add(element);
		return this;
	}

}