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| org.apache.jetspeed.util.MultiFileChecksumHelper |
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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.File; |
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| 20 | import java.io.FileInputStream; |
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| 21 | import java.io.IOException; |
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| 22 | import java.util.zip.Adler32; |
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| 23 | import java.util.zip.CheckedInputStream; |
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| 24 | import java.util.zip.Checksum; |
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| 25 | ||
| 26 | /** |
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| 27 | * Perform a single checksum calculation for multiple files |
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| 28 | * |
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| 29 | * @author <a href="mailto:ate@douma.nu">Ate Douma</a> |
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| 30 | * @author <a href="mailto:taylor@apache.org">David Sean Taylor </a> |
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| 31 | * @version $Id$ |
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| 32 | */ |
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| 33 | 0 | public class MultiFileChecksumHelper |
| 34 | { |
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| 35 | public static long getChecksum(File[] files) |
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| 36 | { |
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| 37 | 0 | CheckedInputStream cis = null; |
| 38 | 0 | FileInputStream is = null; |
| 39 | 0 | Checksum checksum = new Adler32(); |
| 40 | 0 | byte[] tempBuf = new byte[128]; |
| 41 | ||
| 42 | 0 | for ( int i = 0; i < files.length && files[i] != null && files[i].exists() && files[i].isFile(); i++ ) |
| 43 | { |
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| 44 | try |
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| 45 | { |
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| 46 | 0 | is = new FileInputStream(files[i]); |
| 47 | 0 | cis = new CheckedInputStream(is, checksum); |
| 48 | 0 | while (cis.read(tempBuf) >= 0) {} |
| 49 | } |
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| 50 | 0 | catch (Exception e) |
| 51 | { |
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| 52 | 0 | throw new RuntimeException(e); |
| 53 | } |
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| 54 | finally |
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| 55 | { |
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| 56 | 0 | if (cis != null) |
| 57 | { |
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| 58 | try |
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| 59 | { |
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| 60 | 0 | cis.close(); |
| 61 | } |
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| 62 | 0 | catch (IOException ioe) {} |
| 63 | 0 | cis = null; |
| 64 | } |
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| 65 | 0 | if (is != null) |
| 66 | { |
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| 67 | try |
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| 68 | { |
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| 69 | 0 | is.close(); |
| 70 | } |
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| 71 | 0 | catch (IOException ioe) {} |
| 72 | 0 | is = null; |
| 73 | } |
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| 74 | } |
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| 75 | } |
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| 76 | 0 | return checksum.getValue(); |
| 77 | } |
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| 78 | } |
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