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Java > Open Source Codes > net > sourceforge > cruisecontrol > util > FileUtil


1 /****************************************************************************
2 * CruiseControl, a Continuous Integration Toolkit
3 * Copyright (c) 2001, ThoughtWorks, Inc.
4 * 651 W Washington Ave. Suite 600
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37
38 package net.sourceforge.cruisecontrol.util;
39
40 import java.io.File JavaDoc;
41 import java.io.FileInputStream JavaDoc;
42 import java.io.FileOutputStream JavaDoc;
43 import java.io.IOException JavaDoc;
44 import java.io.InputStream JavaDoc;
45 import java.io.ObjectOutputStream JavaDoc;
46
47 import org.apache.log4j.Logger;
48
49 public final class FileUtil {
50
51     private static final Logger LOG = Logger.getLogger(FileUtil.class);
52
53     private FileUtil() {
54
55     }
56
57     public static byte[] getFileAsBytes(File JavaDoc file) throws IOException JavaDoc {
58         InputStream JavaDoc is = new FileInputStream JavaDoc(file);
59
60         // Get the size of the file
61 long length = file.length();
62
63         // You cannot create an array using a long type.
64 // It needs to be an int type.
65 // Before converting to an int type, check
66 // to ensure that file is not larger than Integer.MAX_VALUE.
67 if (length > Integer.MAX_VALUE) {
68             // File is too large
69 throw new IOException JavaDoc("File too large. File size is " + length + ". Maximum allowed is "
70                     + Integer.MAX_VALUE);
71         }
72
73         // Create the byte array to hold the data
74 byte[] bytes = new byte[(int) length];
75
76         // Read in the bytes
77 int offset = 0;
78         int numRead = 0;
79         while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
80             offset += numRead;
81         }
82
83         // Ensure all the bytes have been read in
84 if (offset < bytes.length) {
85             throw new IOException JavaDoc("Could not completely read file " + file.getName());
86         }
87
88         // Close the input stream and return bytes
89 is.close();
90         return bytes;
91     }
92     
93     public static String JavaDoc bytesToFile(byte[] data, String JavaDoc filePath) {
94         File JavaDoc outFile = new File JavaDoc(filePath);
95         try {
96             FileOutputStream JavaDoc fos = new FileOutputStream JavaDoc(outFile);
97             ObjectOutputStream JavaDoc oos = new ObjectOutputStream JavaDoc(fos);
98             oos.writeObject(data);
99             oos.close();
100             fos.close();
101         } catch (IOException JavaDoc e) {
102             String JavaDoc message = "Error creating output file";
103             LOG.error(message, e);
104             System.err.println(message + " - " + e.getMessage());
105         }
106         return filePath;
107     }
108     
109     public static String JavaDoc bytesToFile(byte[] data, String JavaDoc parentDirName, String JavaDoc fileName) {
110         String JavaDoc filePath = null;
111         try {
112             filePath = new File JavaDoc(parentDirName, fileName).getCanonicalPath();
113         } catch (IOException JavaDoc e) {
114             String JavaDoc message = "Could not determine canonical name for: " + parentDirName + File.separator + fileName;
115             System.err.println(message);
116             LOG.error(message, e);
117         }
118         return bytesToFile(data, filePath);
119     }
120 }
121
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