/**
* Initialize the observer.
*
* @throws Exception if an error occurs
*/
public void initialize() throws Exception {
rootEntry.refresh(rootEntry.getFile());
File[] files = listFiles(rootEntry.getFile());
FileEntry[] children = files.length > 0 ? new FileEntry[files.length] : FileEntry.EMPTY_ENTRIES;
for (int i = 0; i < files.length; i++) {
children[i] = createFileEntry(rootEntry, files[i]);
}
rootEntry.setChildren(children);
}
/**
* Fire directory/file change events to the registered listeners.
*
* @param entry The previous file system entry
* @param file The current file
*/
private void doMatch(FileEntry entry, File file) {
if (entry.refresh(file)) {
for (FileAlterationListener listener : listeners) {
if (entry.isDirectory()) {
listener.onDirectoryChange(file);
} else {
listener.onFileChange(file);
}
}
}
}
/**
* Create a new file entry for the specified file.
*
* @param parent The parent file entry
* @param file The file to create an entry for
* @return A new file entry
*/
private FileEntry createFileEntry(FileEntry parent, File file) {
FileEntry entry = parent.newChildInstance(file);
entry.refresh(file);
File[] files = listFiles(file);
FileEntry[] children = files.length > 0 ? new FileEntry[files.length] : FileEntry.EMPTY_ENTRIES;
for (int i = 0; i < files.length; i++) {
children[i] = createFileEntry(entry, files[i]);
}
entry.setChildren(children);
return entry;
}
