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: package org.apache.jetspeed.util;
18:
19: import java.io.File;
20: import java.io.FileInputStream;
21: import java.io.FileNotFoundException;
22: import java.io.IOException;
23: import java.io.InputStream;
24:
25: /**
26: * implements common directory and jar operations
27: *
28: * @author <a href="mailto:taylor@apache.org">David Sean Taylor </a>
29: * @version $Id: AbstractFileSystemHelper.java 516448 2007-03-09 16:25:47Z ate $
30: */
31: public abstract class AbstractFileSystemHelper {
32: public abstract File getRootDirectory();
33:
34: public long getChecksum(String path) {
35: File child = new File(getRootDirectory(), path);
36: if (child == null || !child.exists()) {
37: return 0;
38: }
39:
40: long checksum = 0;
41: InputStream is = null;
42: try {
43: is = new FileInputStream(child);
44: checksum = ChecksumHelper.getChecksum(is);
45: } catch (FileNotFoundException e) {
46: } finally {
47: if (is != null) {
48: try {
49: is.close();
50: } catch (IOException io) {
51: }
52: }
53: }
54: return checksum;
55: }
56:
57: }
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