Mercurial > dive4elements > http-client

annotate src/main/java/de/intevation/artifacts/httpclient/http/HttpClientImpl.java @ 4:19b3ba7f2568

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Added a method to the http client to list the existing users of the artifact database. http-client/trunk@1412 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 07 Mar 2011 13:42:33 +0000
parents 19a617578b88
children 7917c21fad01
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 path of the resource to create new artifact collections.*/
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49 public static final String PATH_CREATE_COLLECTION = "/create-collection";
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50
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51 private String serverUrl;
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52
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53
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54 public HttpClientImpl(String serverUrl) {
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55 this.serverUrl = serverUrl;
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56 }
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57
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58
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59 @Override
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60 public ArtifactFactory[] getArtifactFactories()
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61 throws ConnectionException
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62 {
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63 ResponseHandler handler = new DocumentResponseHandler();
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64
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65 try {
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66 String url = serverUrl + "/factories";
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67 Document result = (Document) handler.handle(doGet(url));
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68
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69 return ArtifactProtocolUtils.extractArtifactFactories(result);
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70 }
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71 catch (IOException ioe) {
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72 throw new ConnectionException(
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73 "Connection to server failed. No Factories recieved.");
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74 }
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75 }
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76
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77
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78 /**
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79 * This method creates a new artifact in the artifact server and returns
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80 * this artifact. The new artifact is created using <i>creator</i>. If no
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81 * {@link ArtifactCreator} is given (null), an {@link Artifact} is returned.
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82 *
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83 * @param doc The CREATE document.
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84 * @param creator The {@link ArtifactCreator} that is used to extract the
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85 * new artifact from response document of the server.
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86 *
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87 * @return the new artifact.
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88 */
1
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89 @Override
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90 public Object create(Document doc, ArtifactCreator creator)
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91 throws ConnectionException
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92 {
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93 ResponseHandler handler = new DocumentResponseHandler();
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94
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95 try {
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96 String url = serverUrl + "/create";
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97 Document result = (Document) handler.handle(doPost(url, doc));
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98
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99 return creator == null
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100 ? ArtifactProtocolUtils.extractArtifact(result)
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101 : creator.create(result);
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102 }
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103 catch (IOException ioe) {
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104 throw new ConnectionException(
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105 "Connection to server failed. No Artifact created.");
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106 }
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107 }
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108
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109
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110 /**
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111 * This method triggers the artifact servers resource to create a new
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112 * artifact collection.
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113 *
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114 * @param create The CREATE document for the collection.
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115 * @param ownerId The uuid of the creator.
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116 * @param handler The handler that is used to create the result object.
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117 *
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118 * @return a result object created by <i>handler</i>.
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119 */
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120 public Object createCollection(
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121 Document create,
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122 String ownerId,
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123 ResponseHandler handler)
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124 throws ConnectionException
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125 {
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126 String url = serverUrl + PATH_CREATE_COLLECTION + "/" + ownerId;
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127
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128 try {
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129 return handler.handle(doPost(url, create));
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130 }
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131 catch (IOException ioe) {
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132 throw new ConnectionException(ioe.getMessage(), ioe);
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133 }
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134 }
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135
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136
1
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137 @Override
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138 public Object describe(
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139 Artifact artifact,
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140 Document doc,
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141 ResponseHandler handler)
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142 throws ConnectionException
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143 {
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144 try {
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145 String url = serverUrl + "/artifact/" + artifact.getUuid();
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146 return handler.handle(doPost(url, doc));
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147 }
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148 catch (IOException ioe) {
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149 throw new ConnectionException(
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150 "Connection to server failed: " + ioe.getMessage());
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151 }
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152 }
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153
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154
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155 @Override
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156 public Object feed(Artifact artifact, Document doc, ResponseHandler handler)
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157 throws ConnectionException
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158 {
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159 try {
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160 String url = serverUrl + "/artifact/" + artifact.getUuid();
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161 Document result = (Document) handler.handle(doPost(url, doc));
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162
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163 return result;
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164 }
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165 catch (IOException ioe) {
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166 throw new ConnectionException(
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167 "Connection to server failed: " + ioe.getMessage());
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168 }
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169 }
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170
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171
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172 @Override
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173 public Object advance(Artifact artifact, Document doc, ResponseHandler handler)
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174 throws ConnectionException
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175 {
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176 try {
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177 String url = serverUrl + "/artifact/" + artifact.getUuid();
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178 Document result = (Document) handler.handle(doPost(url, doc));
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179
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180 return result;
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181 }
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182 catch (IOException ioe) {
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183 throw new ConnectionException(
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184 "Connection to server failed: " + ioe.getMessage());
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185 }
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186 }
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187
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188
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189 @Override
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190 public void out(
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191 Artifact artifact,
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192 Document doc,
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193 String target,
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194 OutputStream out)
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195 throws ConnectionException
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196 {
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197 try {
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198 String url =
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199 serverUrl
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200 + "/artifact/"
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201 + artifact.getUuid()
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202 + "/" + target;
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203
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204 ResponseHandler handler = new StreamResponseHandler();
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205
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206 InputStream stream = (InputStream) handler.handle(doPost(url, doc));
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207
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208 byte[] b = new byte[4096];
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209 int i = -1;
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210 while ((i = stream.read(b)) > 0) {
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211 out.write(b, 0, i);
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212 }
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213 }
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214 catch (IOException ioe) {
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215 throw new ConnectionException(
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216 "Connection to server failed: " + ioe.getMessage());
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217 }
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218 }
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219
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220
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221 private Response doPost(String url, Document body) throws IOException {
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222 logger.info("Start HTTP-POST request to: "+ url);
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223
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224 Client client = new Client(Protocol.HTTP);
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225 Request request = new Request(Method.POST, url);
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226
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227 Representation representation = new DomRepresentation(
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228 MediaType.APPLICATION_XML,
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229 body);
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230
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231 request.setEntity(representation);
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232 Response response = client.handle(request);
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233
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234 Status status = response.getStatus();
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235 if (status.getCode() != 200) {
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236 logger.error("Response status: " + status.getCode());
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237 throw new IOException(status.getDescription());
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238 }
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239
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240 return response;
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241 }
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242
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243
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244 private Response doGet(String url) throws IOException {
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245 logger.info("Start HTTP-POST request to: "+ url);
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246
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247 Client client = new Client(Protocol.HTTP);
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248 Request request = new Request(Method.GET, url);
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249
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250 Response response = client.handle(request);
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251
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252 Status status = response.getStatus();
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253 if (status.getCode() != 200) {
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254 logger.error("Response status: " + status.getCode());
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255 throw new IOException(status.getDescription());
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256 }
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257
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258 return response;
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259 }
4
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260
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261
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262 /*******************************
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263 * Users API
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264 *******************************/
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265 public Document listUsers()
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266 throws ConnectionException
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267 {
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268 ResponseHandler handler = new DocumentResponseHandler();
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269 String url = serverUrl + PATH_LIST_USERS;
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270
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271 try {
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272 return (Document) handler.handle(doGet(url));
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273 }
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274 catch (IOException ioe) {
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275 throw new ConnectionException(ioe.getMessage(), ioe);
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276 }
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277 }
1
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278 }
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279 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org