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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/rest/CollectionResource.java @ 142:e986e32bc7d4

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Added a Rest resource that handles operations specific to a collection. artifacts/trunk@1367 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 02 Mar 2011 15:10:34 +0000
parents
children fbaeb5931d10
rev   line source
142
e986e32bc7d4 Added a Rest resource that handles operations specific to a collection.
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1 /*
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2 * Copyright (c) 2011 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 package de.intevation.artifactdatabase.rest;
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9
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10 import de.intevation.artifacts.ArtifactDatabase;
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11 import de.intevation.artifacts.ArtifactDatabaseException;
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12 import de.intevation.artifacts.CallMeta;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.XMLUtils;
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16
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17 import java.io.IOException;
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18
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19 import org.apache.log4j.Logger;
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20
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21 import org.restlet.data.MediaType;
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22 import org.restlet.data.Status;
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23 import org.restlet.ext.xml.DomRepresentation;
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24 import org.restlet.representation.EmptyRepresentation;
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25 import org.restlet.representation.Representation;
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26 import org.restlet.Request;
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27 import org.restlet.Response;
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28
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29 import org.w3c.dom.Document;
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30
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31
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32 /**
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33 * @author <a href="mailto:ingo.weinzierl@intevation">Ingo Weinzierl</a>
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34 */
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35 public class CollectionResource
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36 extends BaseResource
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37 {
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38 /** The logger that is used in this class.*/
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39 private static Logger logger = Logger.getLogger(CollectionResource.class);
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40
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41 /** server URL where to reach the resource.*/
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42 public static final String PATH = "/collection/{uuid}";
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43
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44 /**
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45 * XPath to figure out the type of action (feed, advance) via the
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46 * incoming POST request.
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47 */
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48 public static final String XPATH_ACTION = "/art:action/art:type/@name";
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49
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50 /**
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51 * XPath to figure out the identifier of the artifact described in the
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52 * action.
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53 */
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54 public static final String XPATH_ARTIFACT =
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55 "/art:action/art:type/art:artifact/@uuid";
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56
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57 /** Error message if no action was given.*/
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58 public static final String NO_ACTION_MSG = "no action given";
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59
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60 /** Error message if a unknown action was given.*/
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61 public static final String NO_SUCH_ACTION_MSG = "no such action";
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62
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63 /** Action name for deleting a collection.*/
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64 public static final String ACTION_DELETE = "delete";
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65
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66 /** Action name for retrieving the attributes of an artifact stored in the
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67 * collection.*/
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68 public static final String ACTION_GET_ATTRIBUTE = "getattribute";
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69
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70 /** Action name for setting the attribute for an artifact stored in the
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71 * collection.*/
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72 public static final String ACTION_SET_ATTRIBUTE = "setattribute";
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73
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74 /** Action name for adding a new artifact to the collection.*/
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75 public static final String ACTION_ADD_ARTIFACT = "addartifact";
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76
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77 /** Action name for removing an artifact from the collection.*/
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78 public static final String ACTION_REMOVE_ARTIFACT = "removeartifact";
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79
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80 /** Action name for listing the artifacts of the collection.*/
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81 public static final String ACTION_LIST_ARTIFACTS = "listartifacts";
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82
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83
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84 /**
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85 * Method to figure out which POST action was triggered and perform this
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86 * operation on the collection specified by 'identifier' and found in the
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87 * artifact database 'db'.
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88 *
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89 * @param identifier The identifier of the collection.
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90 * @param action The action to be performed.
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91 * @param source The input document to further parameterize the operation.
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92 * @param db The artifact database where to find the collection.
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93 *
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94 * @return The representation produced by the performed action.
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95 */
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96 protected Representation dispatch(
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97 String identifier,
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98 String action,
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99 Document source,
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100 ArtifactDatabase db
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101 ) {
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102 Document out = null;
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103
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104 try {
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105 CallMeta meta = getCallMeta();
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106
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107 if (action.equals(ACTION_DELETE)) {
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108 logger.info("Delete collection '" + identifier + "'");
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109 out = db.deleteCollection(identifier, getCallMeta());
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110 }
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111 else if (action.equals(ACTION_ADD_ARTIFACT)) {
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112 String art = getArtifactIdentifier(source);
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113
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114 logger.info("Add artifact '" + art + "' to collection.");
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115 out = db.addCollectionArtifact(identifier, art, meta);
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116 }
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117 else if (action.equals(ACTION_REMOVE_ARTIFACT)) {
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118 String art = getArtifactIdentifier(source);
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119
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120 logger.info("Remove artifact '" + art + "' from collection.");
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121 out = db.removeCollectionArtifact(identifier, art, meta);
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122 }
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123 else if (action.equals(ACTION_LIST_ARTIFACTS)) {
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124 logger.info("List artifacts of collection '" + identifier +"'");
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125 out = db.listCollectionArtifacts(identifier, meta);
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126 }
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127 else if (action.equals(ACTION_SET_ATTRIBUTE)) {
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128 String art = getArtifactIdentifier(source);
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129
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130 logger.info("Set attribute for artifact '" + art + "'");
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131 out = db.setCollectionAttribute(identifier, art, source, meta);
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132 }
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133 else if (action.equals(ACTION_GET_ATTRIBUTE)) {
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134 String art = getArtifactIdentifier(source);
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135
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136 logger.info("Retrieve attribute of artifact '" + art + "'");
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137 out = db.getCollectionAttribute(identifier, art, meta);
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138 }
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139 else {
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140 throw new ArtifactDatabaseException(NO_SUCH_ACTION_MSG);
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141 }
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142 }
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143 catch (ArtifactDatabaseException adbe) {
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144 logger.warn(adbe.getLocalizedMessage(), adbe);
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145
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146 Response response = getResponse();
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147 response.setStatus(
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148 Status.CLIENT_ERROR_BAD_REQUEST, adbe.getMessage());
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149 return new EmptyRepresentation();
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150 }
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151
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152 return new DomRepresentation(MediaType.APPLICATION_XML, out);
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153 }
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154
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155
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156 @Override
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157 protected Representation innerPost(Representation requestRepr) {
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158 Document input = null;
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159 try {
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160 DomRepresentation in = new DomRepresentation(requestRepr);
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161 in.setNamespaceAware(true);
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162 input = in.getDocument();
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163 }
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164 catch (IOException ioe) {
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165 logger.error(ioe.getLocalizedMessage(), ioe);
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166
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167 Response response = getResponse();
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168 response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, ioe);
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169 return new EmptyRepresentation();
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170 }
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171
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172 String action = XMLUtils.xpathString(
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173 input, XPATH_ACTION, ArtifactNamespaceContext.INSTANCE);
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174
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175 if (action == null || action.length() == 0) {
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176 Response response = getResponse();
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177 response.setStatus(
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178 Status.CLIENT_ERROR_BAD_REQUEST, NO_ACTION_MSG);
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179 return new EmptyRepresentation();
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180 }
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181
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182 Request request = getRequest();
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183
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184 String identifier = (String) request.getAttributes().get("uuid");
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185
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186 ArtifactDatabase db = getArtifactDatabase();
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187
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188 return dispatch(identifier, action, input, db);
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189 }
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190
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191
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192 /**
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193 * Retrieves the identifier of the artifact used in the action.
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194 *
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195 * @param source The incoming document that describes the operation.
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196 *
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197 * @return the uuid of the artifact described in the document.
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198 */
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199 protected String getArtifactIdentifier(Document source) {
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200 return XMLUtils.xpathString(
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201 source, XPATH_ARTIFACT, ArtifactNamespaceContext.INSTANCE);
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202 }
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203 }
http://dive4elements.wald.intevation.org