63 lines
1.5 KiB
Java
63 lines
1.5 KiB
Java
package zutil;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.util.Timer;
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import java.util.TimerTask;
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/**
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* This class calls a given listener
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* when a file is changed
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* @author Ziver
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*
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*/
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public class FileWatcher extends TimerTask{
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private FileChangeListener listener;
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private long lastChanged;
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private File file;
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/**
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* Creates a watcher for the given file whit the check
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* interval of 1 second
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*
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* @param file The file to check
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* @throws FileNotFoundException
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*/
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public FileWatcher(File file) throws FileNotFoundException{
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this(file, 1000);
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}
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/**
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* Creates a watcher for the given file whit the given
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* check interval
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*
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* @param file The file
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* @param intervall The interval
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* @throws FileNotFoundException
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*/
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public FileWatcher(File file, int intervall) throws FileNotFoundException{
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if(file==null || !file.exists()) throw new FileNotFoundException("File not found: "+file);
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this.file = file;
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lastChanged = file.lastModified();
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Timer t = new Timer(true);
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t.schedule(this, 0, intervall);
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}
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public void setListener(FileChangeListener listener){
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this.listener = listener;
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}
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@Override
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public void run() {
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if (lastChanged != file.lastModified()) {
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lastChanged = file.lastModified();
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if(listener != null){
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listener.fileChangedEvent(file);
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}
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else{
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MultiPrintStream.out.println("File Changed: "+file);
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}
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}
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}
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}
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