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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/ProxyArtifact.java @ 93:e27cf9c84eb8

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Unified imports. artifacts/trunk@849 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 28 Mar 2010 15:57:40 +0000
parents 68285f7bc476
children 933bbc9fc11f
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import de.intevation.artifacts.Artifact;
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4 import de.intevation.artifacts.CallContext;
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5
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6 import java.io.IOException;
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7 import java.io.OutputStream;
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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 org.w3c.dom.Document;
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12
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13 /**
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14 * The proxy artifact is a wrapper around another artifact. It simply forwards
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15 * the interface calls to this underlaying artifact.
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16 * The reason for using proxy artifacts is enable the workflow to exchange
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17 * artifacts at any time by something else without losing the concrete
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18 * artifact. From the outside it always looks like there is only one
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19 * distinct artifact.<br>
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20 *
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21 * An inner artifact is able to replace itself by indirectly hand over
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22 * the replacement via the call context to the proxy artifact.<br>
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23 * To do so the proxied artifact has to call
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24 * <code>callContext.getContextValue(EPLACE_PROXY, replacement);</code>.
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25 * After the current call (describe, feed, advance and out) of the proxied
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26 * artifact is finished the proxy artifact replaces the former proxied artifact
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27 * with the replacement.
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28 *
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29 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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30 */
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31 public class ProxyArtifact
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32 extends DefaultArtifact
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33 {
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34 /**
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35 * Key to signal that the proxied artifact should be replaced.
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36 */
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37 public static final Object REPLACE_PROXY = new Object();
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39 private static Logger logger = Logger.getLogger(ProxyArtifact.class);
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41 /**
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42 * The proxied artifact.
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43 */
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44 protected Artifact proxied;
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45
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46 /**
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47 * Default constructor.
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48 */
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49 public ProxyArtifact() {
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50 }
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51
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52 /**
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53 * Constructor to create a new proxy artifact around a given artifact.
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54 * @param proxied The artifact to be proxied.
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55 */
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56 public ProxyArtifact(Artifact proxied) {
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57 this.proxied = proxied;
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58 }
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59
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60 /**
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61 * The currently proxied artifact.
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62 * @return The proxied artifact.
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63 */
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64 public Artifact getProxied() {
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65 return proxied;
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66 }
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68 /**
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69 * Explicitly set the proxied artifacts.
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70 * @param proxied
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71 */
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72 public void setProxied(Artifact proxied) {
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73 this.proxied = proxied;
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74 }
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75
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76 @Override
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77 public void setIdentifier(String identifier) {
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78 this.identifier = identifier;
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79
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80 if (proxied != null)
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81 proxied.setIdentifier(identifier);
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82 }
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84 /**
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85 * Method to check if the current proxied artifact should be replaced
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86 * by a new one coming from the call context.
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87 * @param callContext
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88 */
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89 protected void checkReplacement(CallContext callContext) {
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90 Object replacement = callContext.getContextValue(REPLACE_PROXY);
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91 if (replacement instanceof Artifact) {
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92 setProxied((Artifact)replacement);
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93 }
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94 }
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96 @Override
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97 public String hash() {
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98 return proxied != null
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99 ? proxied.hash()
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100 : super.hash();
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101 }
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102
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103 @Override
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104 public Document describe(Document data, CallContext context) {
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105 try {
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106 return proxied != null
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107 ? proxied.describe(data, context)
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108 : super.describe(data, context);
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109 }
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110 finally {
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111 checkReplacement(context);
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112 }
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113 }
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114
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115 @Override
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116 public Document advance(Document target, CallContext context) {
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117 try {
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118 return proxied != null
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119 ? proxied.advance(target, context)
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120 : super.advance(target, context);
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121 }
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122 finally {
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123 checkReplacement(context);
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124 }
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125 }
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126
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127 @Override
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128 public Document feed(Document target, CallContext context) {
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129 try {
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130 return proxied != null
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131 ? proxied.feed(target, context)
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132 : super.feed(target, context);
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133 }
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134 finally {
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135 checkReplacement(context);
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136 }
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137 }
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138
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139 @Override
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140 public void out(
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141 Document format,
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142 OutputStream out,
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143 CallContext context
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144 )
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145 throws IOException
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146 {
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147 try {
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148 if (proxied != null) {
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149 proxied.out(format, out, context);
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150 }
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151 else {
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152 super.out(format, out, context);
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153 }
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154 }
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155 finally {
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156 checkReplacement(context);
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157 }
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158 }
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159
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160 @Override
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161 public void endOfLife(Object context) {
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162 if (proxied != null) {
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163 proxied.endOfLife(context);
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164 }
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165 else {
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166 super.endOfLife(context);
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167 }
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168 }
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169
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170 @Override
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171 public void cleanup(Object context) {
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172 if (proxied != null)
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173 proxied.cleanup(context);
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174 else
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175 super.cleanup(context);
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176 }
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177 }
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178 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org