Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/rest/ArtifactResource.java @ 217:87a7773030b5

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The Backend got a method that retrieves an ArtifactCollection based on its GID. artifacts/trunk@1556 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 24 Mar 2011 15:41:25 +0000
parents b2115f484edb
children 3447fa62f007
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.rest;
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10
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11 import de.intevation.artifacts.common.utils.XMLUtils;
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12
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13 import de.intevation.artifacts.Artifact;
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14 import de.intevation.artifacts.ArtifactDatabase;
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15 import de.intevation.artifacts.ArtifactDatabaseException;
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16 import de.intevation.artifacts.ArtifactNamespaceContext;
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17
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18 import java.io.IOException;
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19
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20 import org.apache.log4j.Logger;
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21
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22 import org.restlet.Request;
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23 import org.restlet.Response;
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25 import org.restlet.data.MediaType;
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26 import org.restlet.data.Status;
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28 import org.restlet.ext.xml.DomRepresentation;
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30 import org.restlet.representation.EmptyRepresentation;
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31 import org.restlet.representation.Representation;
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33 import org.restlet.resource.ResourceException;
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34
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35 import org.w3c.dom.Document;
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36
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37 /**
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38 * Resource to expose the core artifact methods
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39 * (describe, feed and advance) via REST.
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40 *
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41 * <ul>
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42 * <li>describe() is modelled via GET.</li>
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43 * <li>advance() and feed() are modelled via POST.</li>
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44 * </ul>
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45 * @author <a href="mailto:sascha.teichmann@intevation">Sascha L. Teichmann</a>
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46 */
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47 public class ArtifactResource
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48 extends BaseResource
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49 {
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50 private static Logger logger = Logger.getLogger(ArtifactResource.class);
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52 /**
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53 * XPath to figure out the type of action (feed, advance) via the
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54 * incoming POST request.
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55 */
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56 public static final String XPATH_ACTION = "/art:action/art:type/@name";
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58 /**
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59 * server URL where to reach the resource.
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60 */
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61 public static final String PATH = "/artifact/{uuid}";
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63 /**
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64 * Error message if no action was given.
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65 */
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66 public static final String NO_ACTION_MESSAGE = "no action given";
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68 /**
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69 * Error message if a unknown action was given.
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70 */
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71 public static final String NO_SUCH_ACTION_MESSAGE = "no such action";
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73 /**
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74 * Error message if the requested artifact was not found in
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75 * the artifact database.
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76 */
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77 public static final String NO_ARTIFACT_FOUND = "Artifact not found";
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79 /**
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80 * Action name 'advance'.
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81 */
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82 public static final String ADVANCE = "advance";
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83 /**
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84 * Action name 'feed'.
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85 */
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86 public static final String FEED = "feed";
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87 /**
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88 * Action name 'describe'.
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89 */
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90 public static final String DESCRIBE = "describe";
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92 @Override
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93 protected Representation innerGet()
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94 throws ResourceException
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95 {
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96 Request request = getRequest();
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97
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98 String identifier = (String)request.getAttributes().get("uuid");
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99
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100 if (logger.isDebugEnabled()) {
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101 logger.debug("looking for artifact id '" + identifier + "'");
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102 }
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103
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104 ArtifactDatabase db = (ArtifactDatabase)getContext()
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105 .getAttributes().get("database");
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106
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107 try {
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108 return new DomRepresentation(
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109 MediaType.APPLICATION_XML,
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110 db.describe(identifier, null, getCallMeta()));
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111 }
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112 catch (ArtifactDatabaseException adbe) {
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113 logger.warn(adbe.getLocalizedMessage(), adbe);
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114 Response response = getResponse();
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115 response.setStatus(
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116 Status.CLIENT_ERROR_NOT_FOUND, adbe.getMessage());
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117 return new EmptyRepresentation();
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118 }
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119 }
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120
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121 /**
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122 * Method to figure out which POST action (feed or advance) was
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123 * triggered and perform this operation on the artifact specified
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124 * by 'identifier' and found in the artifact database 'db'
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125 * @param identifier The identifier of the artifact.
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126 * @param action The action to be performed.
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127 * @param source The input document to further parameterize the
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128 * operation.
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129 * @param db The artifact database where to find the artifact.
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130 * @return The representation produced by the performed action.
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131 */
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132 protected Representation dispatch(
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133 String identifier,
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134 String action,
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135 Document source,
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136 ArtifactDatabase db
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137 ) {
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138 Document out = null;
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139
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140 try {
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141 if (action.equals(FEED)) {
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142 out = db.feed(identifier, source, getCallMeta());
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143 }
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144 else if (action.equals(ADVANCE)) {
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145 out = db.advance(identifier, source, getCallMeta());
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146 }
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147 else if (action.equals(DESCRIBE)) {
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148 out = db.describe(identifier, source, getCallMeta());
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149 }
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150 else {
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151 throw new ArtifactDatabaseException(NO_SUCH_ACTION_MESSAGE);
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152 }
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153 }
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154 catch (ArtifactDatabaseException adbe) {
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155 logger.warn(adbe.getLocalizedMessage(), adbe);
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156 Response response = getResponse();
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157 response.setStatus(
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158 Status.CLIENT_ERROR_BAD_REQUEST, adbe.getMessage());
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159 return new EmptyRepresentation();
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160 }
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161
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162 return new DomRepresentation(MediaType.APPLICATION_XML, out);
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163 }
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164
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165 @Override
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166 protected Representation innerPost(Representation requestRepr) {
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167
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168 Document inputDocument = null;
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169 try {
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170 DomRepresentation input = new DomRepresentation(requestRepr);
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171 input.setNamespaceAware(true);
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172 inputDocument = input.getDocument();
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173 }
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174 catch (IOException ioe) {
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175 logger.error(ioe.getMessage());
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176 Response response = getResponse();
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177 response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, ioe);
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178 return new EmptyRepresentation();
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179 }
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180
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181 String action = XMLUtils.xpathString(
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182 inputDocument,
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183 XPATH_ACTION,
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184 ArtifactNamespaceContext.INSTANCE);
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185
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186 if (action == null || action.length() == 0) {
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187 Response response = getResponse();
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188 response.setStatus(
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189 Status.CLIENT_ERROR_BAD_REQUEST, NO_ACTION_MESSAGE);
28
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190 return new EmptyRepresentation();
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191 }
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192
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193 Request request = getRequest();
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194
28
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195 String identifier = (String)request.getAttributes().get("uuid");
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196
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197 ArtifactDatabase db = (ArtifactDatabase)getContext()
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198 .getAttributes().get("database");
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199
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200 return dispatch(identifier, action, inputDocument, db);
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201 }
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202 }
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203 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org