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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/ProxyArtifact.java @ 68:541814404822

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Added interfaces for XML processing services. TODO: Implement them! artifacts/trunk@593 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 22 Jan 2010 09:48:18 +0000
parents 85d996328c8a
children 48d1a9a082c2
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
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8 import org.apache.log4j.Logger;
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9
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10 import java.io.IOException;
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11 import java.io.OutputStream;
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12
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13 /**
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14 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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15 */
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16 public class ProxyArtifact
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17 extends DefaultArtifact
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18 {
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19 public static final Object REPLACE_PROXY = new Object();
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20
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21 private static Logger logger = Logger.getLogger(ProxyArtifact.class);
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22
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23 protected Artifact proxied;
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24
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25 public ProxyArtifact() {
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26 }
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27
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28 public ProxyArtifact(Artifact proxied) {
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29 this.proxied = proxied;
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30 }
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31
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32 public Artifact getProxied() {
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33 return proxied;
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34 }
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35
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36 public void setProxied(Artifact proxied) {
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37 this.proxied = proxied;
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38 }
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39
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40 protected void checkReplacement(CallContext callContext) {
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41 Object replacement = callContext.getContextValue(REPLACE_PROXY);
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42 if (replacement instanceof Artifact) {
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43 setProxied((Artifact)replacement);
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44 }
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45 }
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46
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47 public String hash() {
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48 return proxied != null
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49 ? proxied.hash()
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50 : super.hash();
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51 }
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52
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53 public Document describe(Document data, CallContext context) {
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54 try {
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55 return proxied != null
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56 ? proxied.describe(data, context)
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57 : super.describe(data, context);
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58 }
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59 finally {
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60 checkReplacement(context);
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61 }
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62 }
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63
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64 public Document advance(Document target, CallContext context) {
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65 try {
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66 return proxied != null
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67 ? proxied.advance(target, context)
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68 : super.advance(target, context);
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69 }
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70 finally {
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71 checkReplacement(context);
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72 }
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73 }
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74
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75 public Document feed(Document target, CallContext context) {
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76 try {
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77 return proxied != null
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78 ? proxied.feed(target, context)
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79 : super.feed(target, context);
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80 }
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81 finally {
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82 checkReplacement(context);
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83 }
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84 }
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85
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86 public void out(
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87 Document format,
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88 OutputStream out,
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89 CallContext context
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90 )
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91 throws IOException
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92 {
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93 try {
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94 if (proxied != null) {
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95 proxied.out(format, out, context);
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96 }
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97 else {
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98 super.out(format, out, context);
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99 }
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100 }
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101 finally {
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102 checkReplacement(context);
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103 }
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104 }
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105
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106 public void endOfLife(Object context) {
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107 if (proxied != null) {
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108 proxied.endOfLife(context);
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109 }
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110 else {
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111 super.endOfLife(context);
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112 }
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113 }
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114 }
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115 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org