Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/rest/BaseOutResource.java @ 253:a2df2b48d2aa

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Enabled the artifact database to handle requests specific to collection attributes and collection item attributes. artifacts/trunk@1746 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 26 Apr 2011 07:43:40 +0000
parents b2115f484edb
children d9a99b28a847
rev   line source
143
7e20702a90ed Implemented an abstract class for the output of artifacts and collections. Added a CollectionOutResource.
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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
207
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10 import de.intevation.artifacts.common.utils.XMLUtils;
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11
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12 import de.intevation.artifacts.ArtifactDatabase;
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13 import de.intevation.artifacts.ArtifactDatabaseException;
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14 import de.intevation.artifacts.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.CallMeta;
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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.Request;
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22 import org.restlet.Response;
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23
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24 import org.restlet.data.MediaType;
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25 import org.restlet.data.Status;
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26
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27 import org.restlet.ext.xml.DomRepresentation;
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28
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29 import org.restlet.representation.EmptyRepresentation;
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30 import org.restlet.representation.Representation;
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31
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32 import org.restlet.resource.ResourceException;
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33
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34 import org.w3c.dom.Document;
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35
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36
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37 /**
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38 * Base Resource to serve the out()-outputs of collections and artifacts.
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39 *
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40 * @author <a href="mailto:ingo.weinzierl@intevation">Ingo Weinzierl</a>
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41 */
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42 public abstract class BaseOutResource
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43 extends BaseResource
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44 {
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45 /** The logger used in this class.*/
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46 private static Logger logger = Logger.getLogger(BaseOutResource.class);
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47
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48 /** XPath to figure out the MIME type of the requested result.*/
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49 public static final String XPATH_MIME_TYPE =
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50 "/art:action/art:out/art:mime-type/@value";
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51
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52 /** Default result MIME type: octet stream.*/
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53 public static final MediaType DEFAULT_MIME_TYPE =
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54 MediaType.APPLICATION_OCTET_STREAM;
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55
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56
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57 @Override
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58 protected Representation innerPost(Representation requestRepr)
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59 throws ResourceException
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60 {
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61 Document inputDocument = null;
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62
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63 try {
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64 DomRepresentation input = new DomRepresentation(requestRepr);
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65 input.setNamespaceAware(true);
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66 inputDocument = input.getDocument();
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67 }
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68 catch (IOException ioe) {
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69 logger.error(ioe.getMessage());
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70 Response response = getResponse();
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71 response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, ioe);
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72 return new EmptyRepresentation();
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73 }
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74
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75 ArtifactDatabase db = getArtifactDatabase();
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76
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77 Request request = getRequest();
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78
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79 String identifier = getIdentifier();
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80
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81 if (logger.isDebugEnabled()) {
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82 logger.debug("looking for artifact id '" + identifier + "'");
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83 }
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84
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85 String mimeTypeString = XMLUtils.xpathString(
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86 inputDocument,
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87 XPATH_MIME_TYPE,
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88 ArtifactNamespaceContext.INSTANCE);
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89
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90 MediaType mimeType = DEFAULT_MIME_TYPE;
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91
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92 if (mimeTypeString != null && mimeTypeString.length() != 0) {
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93 try {
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94 mimeType = MediaType.valueOf(mimeTypeString);
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95 }
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96 catch (Exception e) {
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97 logger.error(e.getLocalizedMessage());
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98 }
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99 }
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100
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101 try {
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102 return new OutRepresentation(
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103 mimeType,
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104 doOut(identifier, inputDocument, db, getCallMeta()));
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105 }
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106 catch (ArtifactDatabaseException adbe) {
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107 Response response = getResponse();
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108 response.setStatus(
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109 Status.CLIENT_ERROR_NOT_FOUND, adbe.getMessage());
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110 return new EmptyRepresentation();
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111 }
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112 }
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113
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114 /**
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115 * Returns the identifier of the artifact or collection.
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116 *
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117 * @return the identifier.
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118 */
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119 protected abstract String getIdentifier();
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120
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121 /**
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122 * This method is called to process the operation on artifacts or
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123 * collections.
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124 *
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125 * @param identifier The identifier of the artifact or collection.
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126 * @param input The input document of the request.
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127 * @param db The artifact database.
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128 * @param meta The CallMeta object.
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129 *
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130 * @return the result of the operation.
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131 */
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132 protected abstract ArtifactDatabase.DeferredOutput doOut(
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133 String identifier,
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134 Document input,
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135 ArtifactDatabase db,
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136 CallMeta meta)
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137 throws ArtifactDatabaseException;
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138 }
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139 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org