Mercurial > dive4elements > http-client
annotate src/main/java/de/intevation/artifacts/httpclient/http/HttpClientImpl.java @ 2:2fdfa20cfa63
Added an interface that is used to create instances of artifacts depending on the framework that includes this lib. The create() method of the HttpClient makes use of this interface.
http-client/trunk@1325 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 17 Feb 2011 11:19:02 +0000 |
parents | c9ac6642973c |
children | 19a617578b88 |
rev | line source |
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1
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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 |
1
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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 private String serverUrl; |
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46 |
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47 |
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48 public HttpClientImpl(String serverUrl) { |
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49 this.serverUrl = serverUrl; |
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50 } |
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51 |
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52 |
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53 @Override |
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54 public ArtifactFactory[] getArtifactFactories() |
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55 throws ConnectionException |
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56 { |
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57 ResponseHandler handler = new DocumentResponseHandler(); |
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58 |
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59 try { |
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60 String url = serverUrl + "/factories"; |
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61 Document result = (Document) handler.handle(doGet(url)); |
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62 |
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63 return ArtifactProtocolUtils.extractArtifactFactories(result); |
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64 } |
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65 catch (IOException ioe) { |
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66 throw new ConnectionException( |
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67 "Connection to server failed. No Factories recieved."); |
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68 } |
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69 } |
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70 |
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71 |
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72 /** |
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73 * This method creates a new artifact in the artifact server and returns |
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74 * this artifact. The new artifact is created using <i>creator</i>. If no |
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75 * {@link ArtifactCreator} is given (null), an {@link Artifact} is returned. |
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76 * |
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77 * @param doc The CREATE document. |
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78 * @param creator The {@link ArtifactCreator} that is used to extract the |
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79 * new artifact from response document of the server. |
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80 * |
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81 * @return the new artifact. |
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82 */ |
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83 @Override |
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84 public Object create(Document doc, ArtifactCreator creator) |
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85 throws ConnectionException |
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86 { |
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87 ResponseHandler handler = new DocumentResponseHandler(); |
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88 |
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89 try { |
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90 String url = serverUrl + "/create"; |
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91 Document result = (Document) handler.handle(doPost(url, doc)); |
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92 |
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93 return creator == null |
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94 ? ArtifactProtocolUtils.extractArtifact(result) |
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95 : creator.create(result); |
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96 } |
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97 catch (IOException ioe) { |
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98 throw new ConnectionException( |
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99 "Connection to server failed. No Artifact created."); |
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100 } |
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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 Object describe( |
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106 Artifact artifact, |
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107 Document doc, |
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108 ResponseHandler handler) |
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109 throws ConnectionException |
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110 { |
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111 try { |
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112 String url = serverUrl + "/artifact/" + artifact.getUuid(); |
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113 return handler.handle(doPost(url, doc)); |
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114 } |
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115 catch (IOException ioe) { |
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116 throw new ConnectionException( |
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117 "Connection to server failed: " + ioe.getMessage()); |
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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 @Override |
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123 public Object feed(Artifact artifact, Document doc, ResponseHandler handler) |
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124 throws ConnectionException |
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125 { |
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126 try { |
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127 String url = serverUrl + "/artifact/" + artifact.getUuid(); |
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128 Document result = (Document) handler.handle(doPost(url, doc)); |
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129 |
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130 return result; |
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131 } |
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132 catch (IOException ioe) { |
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133 throw new ConnectionException( |
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134 "Connection to server failed: " + ioe.getMessage()); |
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135 } |
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136 } |
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137 |
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138 |
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139 @Override |
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140 public Object advance(Artifact artifact, Document doc, ResponseHandler handler) |
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141 throws ConnectionException |
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142 { |
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143 try { |
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144 String url = serverUrl + "/artifact/" + artifact.getUuid(); |
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145 Document result = (Document) handler.handle(doPost(url, doc)); |
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146 |
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147 return result; |
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148 } |
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149 catch (IOException ioe) { |
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150 throw new ConnectionException( |
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151 "Connection to server failed: " + ioe.getMessage()); |
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152 } |
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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 public void out( |
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158 Artifact artifact, |
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159 Document doc, |
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160 String target, |
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161 OutputStream out) |
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162 throws ConnectionException |
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163 { |
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164 try { |
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165 String url = |
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166 serverUrl |
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167 + "/artifact/" |
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168 + artifact.getUuid() |
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169 + "/" + target; |
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170 |
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171 ResponseHandler handler = new StreamResponseHandler(); |
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172 |
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173 InputStream stream = (InputStream) handler.handle(doPost(url, doc)); |
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174 |
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175 byte[] b = new byte[4096]; |
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176 int i = -1; |
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177 while ((i = stream.read(b)) > 0) { |
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178 out.write(b, 0, i); |
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179 } |
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180 } |
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181 catch (IOException ioe) { |
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182 throw new ConnectionException( |
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183 "Connection to server failed: " + ioe.getMessage()); |
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184 } |
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185 } |
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186 |
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187 |
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188 private Response doPost(String url, Document body) throws IOException { |
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189 logger.info("Start HTTP-POST request to: "+ url); |
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190 |
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191 Client client = new Client(Protocol.HTTP); |
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192 Request request = new Request(Method.POST, url); |
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193 |
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194 Representation representation = new DomRepresentation( |
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195 MediaType.APPLICATION_XML, |
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196 body); |
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197 |
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198 request.setEntity(representation); |
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199 Response response = client.handle(request); |
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200 |
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201 Status status = response.getStatus(); |
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202 if (status.getCode() != 200) { |
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203 logger.error("Response status: " + status.getCode()); |
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204 throw new IOException(status.getDescription()); |
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205 } |
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206 |
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207 return response; |
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208 } |
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209 |
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210 |
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211 private Response doGet(String url) throws IOException { |
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212 logger.info("Start HTTP-POST request to: "+ url); |
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213 |
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214 Client client = new Client(Protocol.HTTP); |
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215 Request request = new Request(Method.GET, url); |
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216 |
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217 Response response = client.handle(request); |
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218 |
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219 Status status = response.getStatus(); |
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220 if (status.getCode() != 200) { |
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221 logger.error("Response status: " + status.getCode()); |
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222 throw new IOException(status.getDescription()); |
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223 } |
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224 |
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225 return response; |
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226 } |
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227 } |
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228 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |