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org.apache.jetspeed.util.ChecksumHelper |
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1 | /* |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | package org.apache.jetspeed.util; |
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18 | ||
19 | import java.io.InputStream; |
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20 | import java.io.IOException; |
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21 | import java.util.zip.Adler32; |
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22 | import java.util.zip.CheckedInputStream; |
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23 | ||
24 | ||
25 | /** |
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26 | * implements checksum related utilities |
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27 | * |
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28 | * @author <a href="mailto:taylor@apache.org">David Sean Taylor </a> |
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29 | * @version $Id: ChecksumHelper.java 516448 2007-03-09 16:25:47Z ate $ |
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30 | */ |
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31 | 0 | public final class ChecksumHelper |
32 | { |
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33 | public static long getChecksum(InputStream is) |
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34 | { |
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35 | 0 | CheckedInputStream cis = null; |
36 | 0 | long checksum = 0; |
37 | try |
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38 | { |
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39 | 0 | cis = new CheckedInputStream(is, class="keyword">new Adler32()); |
40 | 0 | byte[] tempBuf = new byte[128]; |
41 | 0 | while (cis.read(tempBuf) >= 0) |
42 | { |
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43 | } |
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44 | 0 | checksum = cis.getChecksum().getValue(); |
45 | } |
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46 | 0 | catch (IOException e) |
47 | { |
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48 | 0 | checksum = 0; |
49 | } |
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50 | finally |
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51 | { |
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52 | 0 | if (cis != null) |
53 | { |
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54 | try |
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55 | { |
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56 | 0 | cis.close(); |
57 | } |
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58 | 0 | catch (IOException ioe) |
59 | { |
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60 | 0 | } |
61 | } |
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62 | } |
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63 | 0 | return checksum; |
64 | } |
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65 | } |
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66 |
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