Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.joran.spi;

import ch.qos.logback.core.spi.ContextAwareBase;

import java.io.File;
import java.net.URL;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.List;

Author:
Ceki Gülcü/**
 * @author Ceki Gülcü
 */
public class ConfigurationWatchList extends ContextAwareBase {

    URL mainURL;
    List<File> fileWatchList = new ArrayList<File>();
    List<Long> lastModifiedList = new ArrayList<Long>();

    public ConfigurationWatchList buildClone() {
        ConfigurationWatchList out = new ConfigurationWatchList();
        out.mainURL = this.mainURL;
        out.fileWatchList = new ArrayList<File>(this.fileWatchList);
        out.lastModifiedList = new ArrayList<Long>(this.lastModifiedList);
        return out;
    }
    
    public void clear() {
        this.mainURL = null;
        lastModifiedList.clear();
        fileWatchList.clear();
    }

    
The mainURL for the configuration file. Null values are allowed.
Params:
mainURL – /**
     * The mainURL for the configuration file. Null values are allowed.
     * @param mainURL
     */
    public void setMainURL(URL mainURL) {
        // main url can be null
        this.mainURL = mainURL;
        if (mainURL != null)
            addAsFileToWatch(mainURL);
    }

    private void addAsFileToWatch(URL url) {
        File file = convertToFile(url);
        if (file != null) {
            fileWatchList.add(file);
            lastModifiedList.add(file.lastModified());
        }
    }

    public void addToWatchList(URL url) {
        addAsFileToWatch(url);
    }

    public URL getMainURL() {
        return mainURL;
    }

    public List<File> getCopyOfFileWatchList() {
        return new ArrayList<File>(fileWatchList);
    }

    public boolean changeDetected() {
        int len = fileWatchList.size();
        for (int i = 0; i < len; i++) {
            long lastModified = lastModifiedList.get(i);
            File file = fileWatchList.get(i);
            if (lastModified != file.lastModified()) {
                return true;
            }
        }
        return false;
        // return (lastModified != fileToScan.lastModified() && lastModified != SENTINEL);
    }

    @SuppressWarnings("deprecation")
    File convertToFile(URL url) {
        String protocol = url.getProtocol();
        if ("file".equals(protocol)) {
            return new File(URLDecoder.decode(url.getFile()));
        } else {
            addInfo("URL [" + url + "] is not of type file");
            return null;
        }
    }

}