Mercurial > dive4elements > http-client

annotate src/main/java/de/intevation/artifacts/httpclient/http/HttpClientImpl.java @ 9:072e8d488f83

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Enhanced the HttpClient with a method to trigger the out() operation of Collections. http-client/trunk@1654 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 07 Apr 2011 11:28:15 +0000
parents 06e9e25632cd
children e79283dad6f2
rev   line source
1
c9ac6642973c Renamed GNVClient and GNVClientImpl to HttpClient and HttpClientImpl.
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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 package de.intevation.artifacts.httpclient.http;
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9
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10 import java.io.InputStream;
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11 import java.io.IOException;
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12 import java.io.OutputStream;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import org.restlet.Client;
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17 import org.restlet.Request;
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18 import org.restlet.Response;
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19 import org.restlet.data.MediaType;
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20 import org.restlet.data.Method;
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21 import org.restlet.data.Protocol;
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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.Representation;
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25
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26 import org.w3c.dom.Document;
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27
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28 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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29 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler;
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30 import de.intevation.artifacts.httpclient.http.response.ResponseHandler;
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31 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler;
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32 import de.intevation.artifacts.httpclient.objects.Artifact;
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33 import de.intevation.artifacts.httpclient.objects.ArtifactFactory;
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34 import de.intevation.artifacts.httpclient.utils.ArtifactProtocolUtils;
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35 import de.intevation.artifacts.httpclient.utils.ArtifactCreator;
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36
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37
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38 /**
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39 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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40 */
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41 public class HttpClientImpl implements HttpClient {
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42
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43 private static final Logger logger = Logger.getLogger(HttpClient.class);
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44
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45 /** The URL part of the resource to list the existing users of the server.*/
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46 public static final String PATH_LIST_USERS = "/list-users";
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47
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48 /** The URL part of the resource to list the Collections owned by a specific
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49 * user.*/
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50 public static final String PATH_USER_COLLECTIONS = "/list-collections";
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51
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52 /** The URL part of the resource to call a specific service.*/
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53 public static final String PATH_SERVICE = "/service";
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54
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55 /** The URL path of the resource to create new artifact collections.*/
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56 public static final String PATH_CREATE_COLLECTION = "/create-collection";
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57
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58 /** The URL path of the resource to work with an artifact collections.*/
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59 public static final String PATH_ACTION_COLLECTION = "/collection";
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60
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61 /** The URL path of the resource to work with an artifact collections.*/
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62 public static final String PATH_OUT_COLLECTION = "/collection";
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63
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64 private String serverUrl;
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65
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66
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67 public HttpClientImpl(String serverUrl) {
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68 this.serverUrl = serverUrl;
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69 }
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70
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71
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72 @Override
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73 public ArtifactFactory[] getArtifactFactories()
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74 throws ConnectionException
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75 {
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76 ResponseHandler handler = new DocumentResponseHandler();
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77
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78 try {
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79 String url = serverUrl + "/factories";
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80 Document result = (Document) handler.handle(doGet(url));
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81
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82 return ArtifactProtocolUtils.extractArtifactFactories(result);
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83 }
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84 catch (IOException ioe) {
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85 throw new ConnectionException(
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86 "Connection to server failed. No Factories recieved.");
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87 }
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88 }
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89
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90
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91 /**
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92 * This method creates a new artifact in the artifact server and returns
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93 * this artifact. The new artifact is created using <i>creator</i>. If no
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94 * {@link ArtifactCreator} is given (null), an {@link Artifact} is returned.
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95 *
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96 * @param doc The CREATE document.
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97 * @param creator The {@link ArtifactCreator} that is used to extract the
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98 * new artifact from response document of the server.
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99 *
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100 * @return the new artifact.
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101 */
1
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102 @Override
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103 public Object create(Document doc, ArtifactCreator creator)
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104 throws ConnectionException
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105 {
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106 ResponseHandler handler = new DocumentResponseHandler();
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107
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108 try {
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109 String url = serverUrl + "/create";
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110 Document result = (Document) handler.handle(doPost(url, doc));
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111
2
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112 return creator == null
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113 ? ArtifactProtocolUtils.extractArtifact(result)
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114 : creator.create(result);
1
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115 }
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116 catch (IOException ioe) {
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117 throw new ConnectionException(
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118 "Connection to server failed. No Artifact created.");
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119 }
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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 Object describe(
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125 Artifact artifact,
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126 Document doc,
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127 ResponseHandler handler)
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128 throws ConnectionException
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129 {
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130 try {
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131 String url = serverUrl + "/artifact/" + artifact.getUuid();
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132 return handler.handle(doPost(url, doc));
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133 }
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134 catch (IOException ioe) {
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135 throw new ConnectionException(
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136 "Connection to server failed: " + ioe.getMessage());
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137 }
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138 }
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139
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140
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141 @Override
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142 public Object feed(Artifact artifact, Document doc, ResponseHandler handler)
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143 throws ConnectionException
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144 {
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145 try {
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146 String url = serverUrl + "/artifact/" + artifact.getUuid();
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147 Document result = (Document) handler.handle(doPost(url, doc));
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148
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149 return result;
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150 }
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151 catch (IOException ioe) {
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152 throw new ConnectionException(
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153 "Connection to server failed: " + ioe.getMessage());
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154 }
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155 }
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156
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157
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158 @Override
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159 public Object advance(Artifact artifact, Document doc, ResponseHandler handler)
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160 throws ConnectionException
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161 {
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162 try {
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163 String url = serverUrl + "/artifact/" + artifact.getUuid();
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164 Document result = (Document) handler.handle(doPost(url, doc));
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165
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166 return result;
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167 }
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168 catch (IOException ioe) {
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169 throw new ConnectionException(
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170 "Connection to server failed: " + ioe.getMessage());
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171 }
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172 }
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173
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174
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175 @Override
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176 public void out(
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177 Artifact artifact,
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178 Document doc,
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179 String target,
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180 OutputStream out)
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181 throws ConnectionException
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182 {
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183 try {
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184 String url =
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185 serverUrl
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186 + "/artifact/"
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187 + artifact.getUuid()
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188 + "/" + target;
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189
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190 ResponseHandler handler = new StreamResponseHandler();
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191
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192 InputStream stream = (InputStream) handler.handle(doPost(url, doc));
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193
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194 byte[] b = new byte[4096];
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195 int i = -1;
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196 while ((i = stream.read(b)) > 0) {
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197 out.write(b, 0, i);
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198 }
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199 }
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200 catch (IOException ioe) {
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201 throw new ConnectionException(
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202 "Connection to server failed: " + ioe.getMessage());
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203 }
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204 }
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205
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206
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207 private Response doPost(String url, Document body) throws IOException {
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208 logger.info("Start HTTP-POST request to: "+ url);
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209
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210 Client client = new Client(Protocol.HTTP);
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211 Request request = new Request(Method.POST, url);
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212
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213 Representation representation = new DomRepresentation(
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214 MediaType.APPLICATION_XML,
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215 body);
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216
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217 request.setEntity(representation);
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218 Response response = client.handle(request);
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219
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220 Status status = response.getStatus();
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221 if (status.getCode() != 200) {
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222 logger.error("Response status: " + status.getCode());
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223 throw new IOException(status.getDescription());
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224 }
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225
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226 return response;
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227 }
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228
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229
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230 private Response doGet(String url) throws IOException {
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231 logger.info("Start HTTP-POST request to: "+ url);
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232
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233 Client client = new Client(Protocol.HTTP);
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234 Request request = new Request(Method.GET, url);
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235
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236 Response response = client.handle(request);
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237
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238 Status status = response.getStatus();
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239 if (status.getCode() != 200) {
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240 logger.error("Response status: " + status.getCode());
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241 throw new IOException(status.getDescription());
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242 }
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243
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244 return response;
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245 }
4
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246
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247
6
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248 //==============================
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249 // Collection API
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250 //==============================
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251
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252 /**
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253 * This method triggers the artifact servers resource to create a new
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254 * artifact collection.
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255 *
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256 * @param create The CREATE document for the collection.
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257 * @param ownerId The uuid of the creator.
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258 * @param handler The handler that is used to create the result object.
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259 *
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260 * @return a result object created by <i>handler</i>.
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261 */
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262 public Object createCollection(
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263 Document create,
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264 String ownerId,
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265 ResponseHandler handler)
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266 throws ConnectionException
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267 {
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268 String url = serverUrl + PATH_CREATE_COLLECTION + "/" + ownerId;
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269
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270 try {
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271 return handler.handle(doPost(url, create));
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272 }
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273 catch (IOException ioe) {
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274 throw new ConnectionException(ioe.getMessage(), ioe);
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275 }
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276 }
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277
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278
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279 /**
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280 * This method might be used to trigger a collection specific action. The
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281 * action that is executed depends on the document <i>actionDoc</i>.
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282 *
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283 * @param actionDoc The document that describes the action to be executed.
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284 * @param uuid The uuid of the collection.
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285 * @param handler The handler that is used to create the result object.
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286 *
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287 * @return a result object created by <i>handler</i>.
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288 */
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289 public Object doCollectionAction(
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290 Document actionDoc,
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291 String uuid,
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292 ResponseHandler handler)
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293 throws ConnectionException
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294 {
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295 String url = serverUrl + PATH_ACTION_COLLECTION + "/" + uuid;
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296
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297 try {
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298 return handler.handle(doPost(url, actionDoc));
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299 }
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300 catch (IOException ioe) {
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301 throw new ConnectionException(ioe.getMessage(), ioe);
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302 }
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303 }
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304
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305
9
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306 /**
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307 * This method triggers the out() operation of a Collection. The result of
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308 * this operation is written to <i>out</i> directly - there is no return
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309 * value.
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310 *
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311 * @param doc The request document for the out() operation.
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312 * @param uuid The identifier of the Collection.
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313 * @param type The name of the output type.
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314 * @param out The OutputStream.
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315 */
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316 public void collectionOut(
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317 Document doc,
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318 String uuid,
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319 String type,
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320 OutputStream out)
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321 throws ConnectionException
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322 {
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323 String url = serverUrl + PATH_OUT_COLLECTION + "/" + uuid + "/" + type;
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324
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325 ResponseHandler handler = new StreamResponseHandler();
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326
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327 try {
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328 InputStream stream = (InputStream) handler.handle(doPost(url, doc));
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329
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330 byte[] b = new byte[4096];
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331 int i = -1;
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332 while ((i = stream.read(b)) > 0) {
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333 out.write(b, 0, i);
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334 }
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335 }
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336 catch (IOException ioe) {
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337 throw new ConnectionException(ioe.getMessage(), ioe);
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338 }
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339 }
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340
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341
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342 /*******************************
5
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343 * Service API
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344 *******************************/
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345
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346 public Document callService(String url, String service, Document input)
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347 throws ConnectionException
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348 {
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349 logger.info("Start service call to '" + service + "'");
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350
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351 DocumentResponseHandler handler = new DocumentResponseHandler();
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352
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353 try {
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354 String serverUrl = url + PATH_SERVICE + "/" + service;
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355 return (Document) handler.handle(doPost(serverUrl, input));
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356 }
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357 catch (IOException ioe) {
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358 throw new ConnectionException(
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359 "Connection to server failed: " + ioe.getMessage());
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360 }
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361 }
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362
7917c21fad01 Enabled the HttpClient to call services that are registered at the artifact server.
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363
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364 /*******************************
4
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365 * Users API
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366 *******************************/
5
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367
4
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368 public Document listUsers()
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369 throws ConnectionException
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370 {
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371 ResponseHandler handler = new DocumentResponseHandler();
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372 String url = serverUrl + PATH_LIST_USERS;
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373
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374 try {
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375 return (Document) handler.handle(doGet(url));
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376 }
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377 catch (IOException ioe) {
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378 throw new ConnectionException(ioe.getMessage(), ioe);
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379 }
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380 }
7
06e9e25632cd Added a method to the HttpClient to list the collection of a user.
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381
06e9e25632cd Added a method to the HttpClient to list the collection of a user.
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382
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383 public Document listUserCollections(String userid)
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384 throws ConnectionException
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385 {
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386 ResponseHandler handler = new DocumentResponseHandler();
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387
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388 String url = serverUrl + PATH_USER_COLLECTIONS + "/" + userid;
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389
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390 try {
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391 return (Document) handler.handle(doGet(url));
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392 }
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393 catch (IOException ioe) {
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394 throw new ConnectionException(ioe.getMessage(), ioe);
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395 }
06e9e25632cd Added a method to the HttpClient to list the collection of a user.
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396 }
1
c9ac6642973c Renamed GNVClient and GNVClientImpl to HttpClient and HttpClientImpl.
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397 }
c9ac6642973c Renamed GNVClient and GNVClientImpl to HttpClient and HttpClientImpl.
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398 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org