/*******************************************************************************
* Copyright (c) 2015 Bruno Medeiros and other Contributors.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Bruno Medeiros - initial API and implementation
*******************************************************************************/
package melnorme.lang.utils;
import static melnorme.utilbox.core.Assert.AssertNamespace.assertNotNull;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import melnorme.utilbox.misc.Location;
public class FileModificationDetectionHelper {
protected final Location fileLocation;
protected BasicFileAttributes fileSyncAttributes;
public FileModificationDetectionHelper(Location fileLocation) {
this.fileLocation = assertNotNull(fileLocation);
}
public Path getFilePath() {
return fileLocation.getPath();
}
public void markRead() throws IOException {
fileSyncAttributes = Files.readAttributes(getFilePath(), BasicFileAttributes.class);
}
public void markStale() {
fileSyncAttributes = null;
}
public boolean isModifiedSinceLastRead() {
BasicFileAttributes newAttributes;
try {
newAttributes = Files.readAttributes(getFilePath(), BasicFileAttributes.class);
} catch (IOException e) {
return true;
}
return hasBeenModified(fileSyncAttributes, newAttributes);
}
protected boolean hasBeenModified(BasicFileAttributes originalAttributes, BasicFileAttributes newAttributes) {
if(newAttributes.lastModifiedTime().toMillis() > System.currentTimeMillis()) {
handleWarning_ModifiedTimeInTheFuture(newAttributes.lastModifiedTime());
}
return
originalAttributes == null ||
originalAttributes.lastModifiedTime().toMillis() != newAttributes.lastModifiedTime().toMillis() ||
originalAttributes.size() != newAttributes.size();
}
@SuppressWarnings("unused")
protected void handleWarning_ModifiedTimeInTheFuture(FileTime lastModifiedTime) {
// Default behavior, ignore
}
}