Mercurial > dive4elements > framework

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

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The Backend got a method that retrieves an ArtifactCollection based on its GID. artifacts/trunk@1556 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 24 Mar 2011 15:41:25 +0000
parents 320a81983c8d
children
rev   line source
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.artifactdatabase.rest;
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11 import de.intevation.artifactdatabase.DefaultCallMeta;
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12 import de.intevation.artifactdatabase.DefaultPreferredLocale;
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13
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14 import de.intevation.artifacts.ArtifactDatabase;
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15 import de.intevation.artifacts.CallMeta;
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16 import de.intevation.artifacts.PreferredLocale;
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17
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18 import java.util.List;
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20 import org.apache.log4j.Logger;
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22 import org.restlet.data.ClientInfo;
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23 import org.restlet.data.Language;
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24 import org.restlet.data.Preference;
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26 import org.restlet.representation.Representation;
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28 import org.restlet.resource.ResourceException;
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29 import org.restlet.resource.ServerResource;
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31 /**
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32 * Base class for the resources of REST interface of the artifact database.
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33 * Primarily used to unify the logging.
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34 * @author <a href="mailto:sascha.teichmann@intevation">Sascha L. Teichmann</a>
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35 */
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36 public class BaseResource
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37 extends ServerResource
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38 {
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39 private static Logger logger = Logger.getLogger(BaseResource.class);
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41 /**
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42 * Default constructor.
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43 */
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44 public BaseResource() {
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45 }
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47 /**
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48 * Overrides the post method of ServerResource to handle some
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49 * exceptions and to the required logging.
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50 * The call bridges to #innerPost(Representation) which
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51 * should be overwitten by the subclasses to do the real
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52 * request processing.
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53 * @param requestRepr The incoming represention of the HTTP request.
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54 * @return The representation produced by #innerPost(Representation).
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55 * @throws ResourceException Thrown if something went wrong during
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56 * request processing.
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57 */
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58 @Override
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59 protected Representation post(Representation requestRepr)
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60 throws ResourceException
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61 {
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62 try {
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63 return innerPost(requestRepr);
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64 }
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65 catch (ResourceException re) {
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66 throw re;
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67 }
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68 catch (RuntimeException re) {
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69 logger.error(re.getLocalizedMessage(), re);
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70 throw re;
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71 }
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72 }
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74 /**
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75 * Trivial implementation of innerPost() which is called by
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76 * #post(Representation) which simply calls super.post(Representation).
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77 * This should be overwritten by subclasses which need POST support.
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78 * @param requestRepr The incoming representation of the request.
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79 * @return The representation produced by super.post(Representation).
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80 * @throws ResourceException Thrown if something went wrong during
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81 * request processing.
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82 */
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83 protected Representation innerPost(Representation requestRepr)
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84 throws ResourceException
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85 {
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86 return super.post(requestRepr);
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87 }
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89 /**
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90 * Wrapper around get() of the super class to handle some exceptions
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91 * and do the corresponing logging. The call is bridged to #innerGet()
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92 * which should be overwritten by subclasses.
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93 * @return The representation produced by #innerGet()
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94 * @throws ResourceException Thrown if something went wrong during
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95 * request processing.
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96 */
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97 @Override
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98 protected Representation get()
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99 throws ResourceException
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100 {
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101 try {
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102 return innerGet();
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103 }
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104 catch (ResourceException re) {
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105 throw re;
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106 }
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107 catch (RuntimeException re) {
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108 logger.error(re.getLocalizedMessage(), re);
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109 throw re;
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110 }
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111 }
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112
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113 /**
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114 * Trivial implementaion of innerGet() which simply calls
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115 * super.get() to produce some output representation. This method
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116 * should be overwritten by subclasses which need GET support.
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117 * @return The representation produced by super.get().
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118 * @throws ResourceException Thrown if something went wrong during
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119 * request processing.
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120 */
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121 protected Representation innerGet()
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122 throws ResourceException
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123 {
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124 return super.get();
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125 }
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126
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127 /**
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128 * Returns meta information (preferred languages et. al.)
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129 * of the current HTTP request.
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130 * @return the meta information
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131 */
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132 protected CallMeta getCallMeta() {
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133 ClientInfo clientInfo = getClientInfo();
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134
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135 List<Preference<Language>> pl = clientInfo.getAcceptedLanguages();
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136
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137 PreferredLocale [] languages = new PreferredLocale[pl.size()];
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138
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139 int index = 0;
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140
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141 for (Preference<Language> p: pl) {
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142 String lang = p.getMetadata().getName();
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143 float quality = p.getQuality();
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144 languages[index++] = new DefaultPreferredLocale(lang, quality);
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145 }
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146
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147 return new DefaultCallMeta(languages);
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148 }
131
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149
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150
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151 /**
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152 * Returns the artifact database stored in the context of the REST
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153 * application.
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154 *
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155 * @return the artifact database.
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156 */
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157 protected ArtifactDatabase getArtifactDatabase() {
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158 return (ArtifactDatabase) getContext().getAttributes().get("database");
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159 }
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160 }
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161 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org