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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/ProxyArtifact.java @ 58:39fec7d714dc

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Added a real artifact proxy class to be more flexible with artifact replacements in artifact databases. artifacts/trunk@359 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 23 Nov 2009 11:15:44 +0000
parents
children 85d996328c8a
rev   line source
58
39fec7d714dc Added a real artifact proxy class to be more flexible with artifact replacements
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1 package de.intevation.artifactdatabase;
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2
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3 import org.w3c.dom.Document;
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4
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5 import de.intevation.artifacts.Artifact;
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6 import de.intevation.artifacts.CallContext;
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7 import de.intevation.artifacts.ArtifactFactory;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import java.io.IOException;
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12 import java.io.OutputStream;
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13
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14 /**
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15 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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16 */
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17 public class ProxyArtifact
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18 extends DefaultArtifact
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19 {
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20 public static final Object REPLACE_PROXY = new Object();
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21
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22 private static Logger logger = Logger.getLogger(ProxyArtifact.class);
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23
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24 protected Artifact proxied;
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25
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26 public ProxyArtifact() {
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27 }
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28
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29 public ProxyArtifact(Artifact proxied) {
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30 this.proxied = proxied;
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31 }
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32
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33 public Artifact getProxied() {
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34 return proxied;
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35 }
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36
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37 public void setProxied(Artifact proxied) {
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38 this.proxied = proxied;
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39 }
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40
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41 protected void checkReplacement(CallContext callContext) {
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42 Object replacement = callContext.getContextValue(REPLACE_PROXY);
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43 if (replacement instanceof Artifact) {
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44 setProxied((Artifact)replacement);
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45 }
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46 }
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47
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48 public String hash() {
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49 return proxied != null
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50 ? proxied.hash()
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51 : super.hash();
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52 }
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53
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54 public Document describe(Document data, CallContext context) {
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55 try {
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56 return proxied != null
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57 ? proxied.describe(data, context)
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58 : super.describe(data, context);
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59 }
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60 finally {
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61 checkReplacement(context);
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62 }
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63 }
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64
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65 public Document advance(Document target, CallContext context) {
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66 try {
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67 return proxied != null
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68 ? proxied.advance(target, context)
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69 : super.advance(target, context);
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70 }
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71 finally {
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72 checkReplacement(context);
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73 }
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74 }
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75
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76 public Document feed(Document target, CallContext context) {
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77 try {
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78 return proxied != null
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79 ? proxied.feed(target, context)
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80 : super.feed(target, context);
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81 }
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82 finally {
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83 checkReplacement(context);
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84 }
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85 }
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86
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87 public void out(
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88 Document format,
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89 OutputStream out,
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90 CallContext context
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91 )
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92 throws IOException
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93 {
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94 try {
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95 if (proxied != null) {
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96 proxied.out(format, out, context);
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97 }
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98 else {
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99 super.out(format, out, context);
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100 }
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101 }
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102 finally {
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103 checkReplacement(context);
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104 }
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105 }
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106
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107 public void endOfLife(Object context) {
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108 if (proxied != null) {
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109 proxied.endOfLife(context);
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110 }
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111 else {
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112 super.endOfLife(context);
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113 }
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114 }
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115 }
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116 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org