01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17:
18: package org.apache.commons.jci.monitor;
19:
20: import java.io.File;
21:
22: /**
23: * FilesystemAlterationObserver represents the state of files
24: * below a certain root directory. It implements the code to
25: * check the filesystem and notify listeners.
26: *
27: * @author tcurdt
28: */
29: public interface FilesystemAlterationObserver {
30:
31: File getRootDirectory();
32:
33: void checkAndNotify();
34:
35: void addListener(final FilesystemAlterationListener pListener);
36:
37: void removeListener(final FilesystemAlterationListener pListener);
38:
39: FilesystemAlterationListener[] getListeners();
40:
41: }
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