Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/ProxyArtifact.java @ 355:6bd37edd9a80

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Added handy implementation of a DataProvider. artifacts/trunk@3333 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Nov 2011 08:28:04 +0000
parents 933bbc9fc11f
children
rev   line source
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.artifactdatabase;
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10
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11 import de.intevation.artifacts.Artifact;
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12 import de.intevation.artifacts.CallContext;
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13
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14 import java.io.IOException;
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15 import java.io.OutputStream;
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16
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17 import org.apache.log4j.Logger;
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18
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19 import org.w3c.dom.Document;
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20
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21 /**
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22 * The proxy artifact is a wrapper around another artifact. It simply forwards
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23 * the interface calls to this underlaying artifact.
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24 * The reason for using proxy artifacts is enable the workflow to exchange
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25 * artifacts at any time by something else without losing the concrete
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26 * artifact. From the outside it always looks like there is only one
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27 * distinct artifact.<br>
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28 *
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29 * An inner artifact is able to replace itself by indirectly hand over
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30 * the replacement via the call context to the proxy artifact.<br>
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31 * To do so the proxied artifact has to call
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32 * <code>callContext.getContextValue(EPLACE_PROXY, replacement);</code>.
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33 * After the current call (describe, feed, advance and out) of the proxied
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34 * artifact is finished the proxy artifact replaces the former proxied artifact
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35 * with the replacement.
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36 *
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37 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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38 */
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39 public class ProxyArtifact
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40 extends DefaultArtifact
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41 {
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42 /**
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43 * Key to signal that the proxied artifact should be replaced.
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44 */
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45 public static final Object REPLACE_PROXY = new Object();
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47 private static Logger logger = Logger.getLogger(ProxyArtifact.class);
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49 /**
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50 * The proxied artifact.
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51 */
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52 protected Artifact proxied;
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54 /**
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55 * Default constructor.
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56 */
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57 public ProxyArtifact() {
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58 }
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60 /**
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61 * Constructor to create a new proxy artifact around a given artifact.
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62 * @param proxied The artifact to be proxied.
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63 */
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64 public ProxyArtifact(Artifact proxied) {
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65 this.proxied = proxied;
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66 }
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67
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68 /**
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69 * The currently proxied artifact.
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70 * @return The proxied artifact.
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71 */
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72 public Artifact getProxied() {
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73 return proxied;
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74 }
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76 /**
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77 * Explicitly set the proxied artifacts.
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78 * @param proxied
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79 */
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80 public void setProxied(Artifact proxied) {
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81 this.proxied = proxied;
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82 }
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83
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84 @Override
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85 public void setIdentifier(String identifier) {
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86 this.identifier = identifier;
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87
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88 if (proxied != null)
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89 proxied.setIdentifier(identifier);
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90 }
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92 /**
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93 * Method to check if the current proxied artifact should be replaced
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94 * by a new one coming from the call context.
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95 * @param callContext
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96 */
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97 protected void checkReplacement(CallContext callContext) {
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98 Object replacement = callContext.getContextValue(REPLACE_PROXY);
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99 if (replacement instanceof Artifact) {
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100 setProxied((Artifact)replacement);
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101 }
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102 }
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103
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104 @Override
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105 public String hash() {
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106 return proxied != null
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107 ? proxied.hash()
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108 : super.hash();
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109 }
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111 @Override
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112 public Document describe(Document data, CallContext context) {
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113 try {
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114 return proxied != null
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115 ? proxied.describe(data, context)
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116 : super.describe(data, context);
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117 }
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118 finally {
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119 checkReplacement(context);
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120 }
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121 }
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122
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123 @Override
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124 public Document advance(Document target, CallContext context) {
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125 try {
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126 return proxied != null
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127 ? proxied.advance(target, context)
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128 : super.advance(target, context);
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129 }
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130 finally {
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131 checkReplacement(context);
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132 }
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133 }
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134
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135 @Override
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136 public Document feed(Document target, CallContext context) {
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137 try {
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138 return proxied != null
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139 ? proxied.feed(target, context)
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140 : super.feed(target, context);
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141 }
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142 finally {
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143 checkReplacement(context);
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144 }
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145 }
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146
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147 @Override
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148 public void out(
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149 Document format,
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150 OutputStream out,
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151 CallContext context
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152 )
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153 throws IOException
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154 {
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155 try {
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156 if (proxied != null) {
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157 proxied.out(format, out, context);
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158 }
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159 else {
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160 super.out(format, out, context);
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161 }
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162 }
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163 finally {
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164 checkReplacement(context);
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165 }
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166 }
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167
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168 @Override
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169 public void endOfLife(Object context) {
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170 if (proxied != null) {
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171 proxied.endOfLife(context);
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172 }
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173 else {
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174 super.endOfLife(context);
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175 }
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176 }
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177
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178 @Override
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179 public void cleanup(Object context) {
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180 if (proxied != null)
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181 proxied.cleanup(context);
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182 else
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183 super.cleanup(context);
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184 }
58
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185 }
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186 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org