Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/de/intevation/artifactdatabase/ProxyArtifact.java @ 58:39fec7d714dc
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 |
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| 57:cf9848c85755 | 58:39fec7d714dc |
|---|---|
| 1 package de.intevation.artifactdatabase; | |
| 2 | |
| 3 import org.w3c.dom.Document; | |
| 4 | |
| 5 import de.intevation.artifacts.Artifact; | |
| 6 import de.intevation.artifacts.CallContext; | |
| 7 import de.intevation.artifacts.ArtifactFactory; | |
| 8 | |
| 9 import org.apache.log4j.Logger; | |
| 10 | |
| 11 import java.io.IOException; | |
| 12 import java.io.OutputStream; | |
| 13 | |
| 14 /** | |
| 15 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) | |
| 16 */ | |
| 17 public class ProxyArtifact | |
| 18 extends DefaultArtifact | |
| 19 { | |
| 20 public static final Object REPLACE_PROXY = new Object(); | |
| 21 | |
| 22 private static Logger logger = Logger.getLogger(ProxyArtifact.class); | |
| 23 | |
| 24 protected Artifact proxied; | |
| 25 | |
| 26 public ProxyArtifact() { | |
| 27 } | |
| 28 | |
| 29 public ProxyArtifact(Artifact proxied) { | |
| 30 this.proxied = proxied; | |
| 31 } | |
| 32 | |
| 33 public Artifact getProxied() { | |
| 34 return proxied; | |
| 35 } | |
| 36 | |
| 37 public void setProxied(Artifact proxied) { | |
| 38 this.proxied = proxied; | |
| 39 } | |
| 40 | |
| 41 protected void checkReplacement(CallContext callContext) { | |
| 42 Object replacement = callContext.getContextValue(REPLACE_PROXY); | |
| 43 if (replacement instanceof Artifact) { | |
| 44 setProxied((Artifact)replacement); | |
| 45 } | |
| 46 } | |
| 47 | |
| 48 public String hash() { | |
| 49 return proxied != null | |
| 50 ? proxied.hash() | |
| 51 : super.hash(); | |
| 52 } | |
| 53 | |
| 54 public Document describe(Document data, CallContext context) { | |
| 55 try { | |
| 56 return proxied != null | |
| 57 ? proxied.describe(data, context) | |
| 58 : super.describe(data, context); | |
| 59 } | |
| 60 finally { | |
| 61 checkReplacement(context); | |
| 62 } | |
| 63 } | |
| 64 | |
| 65 public Document advance(Document target, CallContext context) { | |
| 66 try { | |
| 67 return proxied != null | |
| 68 ? proxied.advance(target, context) | |
| 69 : super.advance(target, context); | |
| 70 } | |
| 71 finally { | |
| 72 checkReplacement(context); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 public Document feed(Document target, CallContext context) { | |
| 77 try { | |
| 78 return proxied != null | |
| 79 ? proxied.feed(target, context) | |
| 80 : super.feed(target, context); | |
| 81 } | |
| 82 finally { | |
| 83 checkReplacement(context); | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 public void out( | |
| 88 Document format, | |
| 89 OutputStream out, | |
| 90 CallContext context | |
| 91 ) | |
| 92 throws IOException | |
| 93 { | |
| 94 try { | |
| 95 if (proxied != null) { | |
| 96 proxied.out(format, out, context); | |
| 97 } | |
| 98 else { | |
| 99 super.out(format, out, context); | |
| 100 } | |
| 101 } | |
| 102 finally { | |
| 103 checkReplacement(context); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 public void endOfLife(Object context) { | |
| 108 if (proxied != null) { | |
| 109 proxied.endOfLife(context); | |
| 110 } | |
| 111 else { | |
| 112 super.endOfLife(context); | |
| 113 } | |
| 114 } | |
| 115 } | |
| 116 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |