KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > SOFA > SOFAnet > Transport > BundleData


1 /*
2  * BundleData.java
3  *
4  * Created on 31. bøezen 2004, 16:23
5  */
6
7 package SOFA.SOFAnet.Transport;
8
9 import java.io.*;
10 import java.util.*;
11 import SOFA.Util.Tools;
12 //import cz.cuni.sofa.lib.Impl.ByteArrayOutputStream;
13
14 /**
15  * BundleData objects represents binary bundles on the interface between transport layer
16  * and the rest of the system.
17  * <p>
18  * The bundle is usually physically located in the file in the temp directory of the system (as jar file).
19  * When the BundleData object is destroyed, its internal file is deleted.
20  *
21  * @author Ladislav Sobr
22  */
23 public class BundleData
24 {
25   private File tempFile;
26   
27   /**
28    * Creates a new instance of BundleData from file.
29    * <p>
30    * If error occures, getFile() will return null
31    *
32    * @param sourceFile the file with bundle
33    * @param copy if true, sourceFile is copied to the temp and this copy is managed by the object; otherwise sourceFile becomes internal file of BundleData (no copying)
34    */
35   public BundleData(File sourceFile, boolean copy)
36   {
37     if (copy)
38     {
39       tempFile = new File(generateFilename());
40       
41       try
42       {
43         FileInputStream in = new FileInputStream(sourceFile);
44         FileOutputStream out = new FileOutputStream(tempFile);
45         Tools.copyStream(in, out);
46         in.close();
47         out.close();
48       }
49       catch (FileNotFoundException e)
50       {
51         delete();
52       }
53       catch (IOException e)
54       {
55         delete();
56       }
57     }
58     else
59     {
60       this.tempFile = sourceFile;
61     }
62   }
63   
64   /**
65    * Creates a new instance of BundleData from byte array.
66    * <p>
67    * The byte array is saved to file in temp,
68    * If error occures, getFile() will return null
69    */
70   public BundleData(byte[] data)
71   {
72     if (data == null)
73     {
74       delete();
75       return;
76     }
77     
78     tempFile = new File(generateFilename());
79
80     try
81     {
82       ByteArrayInputStream in = new ByteArrayInputStream(data);
83       FileOutputStream out = new FileOutputStream(tempFile);
84       Tools.copyStream(in, out);
85       in.close();
86       out.close();
87     }
88     catch (FileNotFoundException e)
89     {
90       delete();
91     }
92     catch (IOException e)
93     {
94       delete();
95     }
96   }
97   
98   /** Deletes internal file */
99   public void delete()
100   {
101     if (tempFile != null)
102     {
103       tempFile.delete();
104       tempFile = null;
105     }
106   }
107   
108   /** Releases reference to internal file without deleting it */
109   public void release()
110   {
111     tempFile = null;
112   }
113   
114   /** Returns reference to the internal file */
115   public File getFile()
116   {
117     return tempFile;
118   }
119   
120   /**
121    * Returns bundle in the form of byte array
122    * @return can be null if internal file doesn't exist or an error occures during loading to memory
123    */
124   public byte[] getData()
125   {
126     if (tempFile == null) return null;
127     
128     try
129     {
130       FileInputStream is = new FileInputStream(tempFile);
131       ByteArrayOutputStream os = new ByteArrayOutputStream();
132       Tools.copyStream(is, os);
133       is.close();
134       byte[] result = os.toByteArray();
135       os.close();
136       return result;
137     }
138     catch (FileNotFoundException e)
139     {
140       return null;
141     }
142     catch (IOException e)
143     {
144       return null;
145     }
146   }
147   
148   /**
149    * Copies content of BundleData (it's inetnal file) to other file.
150    *
151    * @param destFile destination file
152    * @param deleteOnError if true, destination file is deleted if an error occures
153    */
154   public boolean copyToFile(File destFile, boolean deleteOnError)
155   {
156     if (destFile == null) return false;
157     if (tempFile == null)
158     {
159       if (deleteOnError) destFile.delete();
160       return false;
161     }
162     
163     try
164     {
165       FileInputStream in = new FileInputStream(tempFile);
166       FileOutputStream out = new FileOutputStream(destFile);
167       Tools.copyStream(in, out);
168       in.close();
169       out.close();
170     }
171     catch (FileNotFoundException e)
172     {
173       if (deleteOnError) destFile.delete();
174       return false;
175     }
176     catch (IOException e)
177     {
178       if (deleteOnError) destFile.delete();
179       return false;
180     }
181     
182     return true;
183   }
184   
185   /** Deletes internal file when the object is destroyed */
186   protected void finalize () throws Throwable JavaDoc
187   {
188     delete();
189     super.finalize();
190   }
191
192   /** Generates filename for the internal file of BundleData - it is located in temp directory of the system */
193   public static String JavaDoc generateFilename()
194   {
195     return System.getProperty("java.io.tmpdir") + File.separator + "sofabundle" + Long.toString(new Date().getTime()) + ".jar";
196   }
197 }
198
Popular Tags