/**
* Compare two file lists for files which have been created, modified or deleted.
*
* @param parent The parent entry
* @param previous The original list of files
* @param files The current list of files
*/
private void checkAndNotify(FileEntry parent, FileEntry[] previous, File[] files) {
int c = 0;
FileEntry[] current = files.length > 0 ? new FileEntry[files.length] : FileEntry.EMPTY_ENTRIES;
for (FileEntry entry : previous) {
while (c < files.length && comparator.compare(entry.getFile(), files[c]) > 0) {
current[c] = createFileEntry(parent, files[c]);
doCreate(current[c]);
c++;
}
if (c < files.length && comparator.compare(entry.getFile(), files[c]) == 0) {
doMatch(entry, files[c]);
checkAndNotify(entry, entry.getChildren(), listFiles(files[c]));
current[c] = entry;
c++;
} else {
checkAndNotify(entry, entry.getChildren(), FileUtils.EMPTY_FILE_ARRAY);
doDelete(entry);
}
}
for (; c < files.length; c++) {
current[c] = createFileEntry(parent, files[c]);
doCreate(current[c]);
}
parent.setChildren(current);
}
/**
* Fire directory/file created events to the registered listeners.
*
* @param entry The file entry
*/
private void doCreate(FileEntry entry) {
for (FileAlterationListener listener : listeners) {
if (entry.isDirectory()) {
listener.onDirectoryCreate(entry.getFile());
} else {
listener.onFileCreate(entry.getFile());
}
}
FileEntry[] children = entry.getChildren();
for (FileEntry aChildren : children) {
doCreate(aChildren);
}
}
/** Check whether the file and its chlidren have been created, modified or deleted. */
public void checkAndNotify() {
/* fire onStart() */
for (FileAlterationListener listener : listeners) {
listener.onStart(this);
}
/* fire directory/file events */
File rootFile = rootEntry.getFile();
if (rootFile.exists()) {
checkAndNotify(rootEntry, rootEntry.getChildren(), listFiles(rootFile));
} else if (rootEntry.isExists()) {
checkAndNotify(rootEntry, rootEntry.getChildren(), FileUtils.EMPTY_FILE_ARRAY);
} else {
// Didn't exist and still doesn't
}
/* fire onStop() */
for (FileAlterationListener listener : listeners) {
listener.onStop(this);
}
}
