Mercurial > hg > blitz_stable

annotate src/org/dancres/io/AnnotatingObjectOutputStream.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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0
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1 package org.dancres.io;
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2
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3 import java.io.IOException;
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4 import java.io.ObjectOutputStream;
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5 import java.io.OutputStream;
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6
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7 import java.rmi.server.RMIClassLoader;
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8
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9 import java.util.WeakHashMap;
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10 import java.util.logging.Logger;
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11 import java.util.logging.Level;
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12
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13 /**
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14 Serializes a set of objects, separting annotations into one stream and
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15 object data into another. This is useful in various situations including
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16 equality checking where one may not wish to include the codebase
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17 annotations.
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18 */
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19 public class AnnotatingObjectOutputStream extends ObjectOutputStream {
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20 private static final Logger theLogger =
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21 Logger.getLogger("org.dancres.io.AnnotatingObjectOutputStream");
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22
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23 private static final WeakHashMap theCachedCodebases = new WeakHashMap();
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24
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25 private ObjectOutputStream theAnnotations;
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26
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27 public AnnotatingObjectOutputStream(OutputStream anObjStream,
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28 OutputStream anAnnStream)
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29 throws IOException {
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30
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31 super(anObjStream);
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32 theAnnotations = new ObjectOutputStream(anAnnStream);
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33 }
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34
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35 protected void annotateClass(Class aClass) throws IOException {
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36 // addAnnotation(RMIClassLoader.getClassAnnotation(aClass));
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37 if (theLogger.isLoggable(Level.FINEST)) {
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38 theLogger.log(Level.FINEST, "Annotating " + aClass.getName() +
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39 ".class with " + getCodebase(aClass));
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40 }
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41
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42 addAnnotation(getCodebase(aClass));
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43 }
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44
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45 protected void annotateProxyClass(Class aClass) throws IOException {
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46 // addAnnotation(RMIClassLoader.getClassAnnotation(aClass));
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47 if (theLogger.isLoggable(Level.FINEST)) {
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48 theLogger.log(Level.FINEST, "Annotating proxy " + aClass.getName() +
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49 ".class with " + getCodebase(aClass));
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50 }
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51
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52 addAnnotation(getCodebase(aClass));
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53 }
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54
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55 private String getCodebase(Class aClass) {
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56 CodebaseHolder myCodebase;
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57
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58 synchronized(theCachedCodebases) {
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59 myCodebase =
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60 (CodebaseHolder) theCachedCodebases.get(aClass);
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61
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62 if (myCodebase == null) {
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63 myCodebase =
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64 new CodebaseHolder(RMIClassLoader.getClassAnnotation(aClass));
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65 theCachedCodebases.put(aClass, myCodebase);
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66 }
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67 }
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68
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69 return myCodebase.getCodebase();
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70 }
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71
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72 private void addAnnotation(String anAnnotation) throws IOException {
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73 theAnnotations.writeObject(anAnnotation);
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74 }
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75
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76 public void flush() throws IOException {
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77 super.flush();
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78 theAnnotations.flush();
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79 }
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80
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81 public void close() throws IOException {
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82 super.close();
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83 theAnnotations.close();
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84 }
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85
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86 private static class CodebaseHolder {
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87 private String theCodebase;
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88
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89 CodebaseHolder(String aCodebase) {
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90 theCodebase = aCodebase;
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91 }
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92
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93 public String getCodebase() {
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94 return theCodebase;
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95 }
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96 }
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97 }