Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 99:5c3d685546a6
Added a new service to describe collections.
flys-client/trunk@1613 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 30 Mar 2011 07:35:59 +0000 |
parents | |
children | f7967d12ce6e |
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98:83bf2fb17b7c | 99:5c3d685546a6 |
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1 package de.intevation.flys.client.server; | |
2 | |
3 import java.util.ArrayList; | |
4 import java.util.List; | |
5 | |
6 import javax.xml.xpath.XPathConstants; | |
7 | |
8 import org.w3c.dom.Document; | |
9 import org.w3c.dom.Node; | |
10 import org.w3c.dom.NodeList; | |
11 | |
12 import com.google.gwt.user.server.rpc.RemoteServiceServlet; | |
13 | |
14 import de.intevation.artifacts.common.ArtifactNamespaceContext; | |
15 import de.intevation.artifacts.common.utils.ClientProtocolUtils; | |
16 import de.intevation.artifacts.common.utils.XMLUtils; | |
17 | |
18 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; | |
19 import de.intevation.artifacts.httpclient.http.HttpClient; | |
20 import de.intevation.artifacts.httpclient.http.HttpClientImpl; | |
21 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler; | |
22 | |
23 import de.intevation.flys.client.shared.model.Artifact; | |
24 import de.intevation.flys.client.shared.model.Collection; | |
25 import de.intevation.flys.client.shared.model.CollectionItem; | |
26 import de.intevation.flys.client.shared.model.DefaultCollection; | |
27 import de.intevation.flys.client.shared.model.DefaultCollectionItem; | |
28 import de.intevation.flys.client.shared.model.DefaultOutputMode; | |
29 import de.intevation.flys.client.shared.model.OutputMode; | |
30 import de.intevation.flys.client.client.services.DescribeCollectionService; | |
31 | |
32 | |
33 /** | |
34 * This service implements a method that queries the DESCRIBE document of a | |
35 * specific collection and returns a Collection object with the information of | |
36 * the document. | |
37 * | |
38 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
39 */ | |
40 public class DescribeCollectionServiceImpl | |
41 extends RemoteServiceServlet | |
42 implements DescribeCollectionService | |
43 { | |
44 public Collection describe(String uuid, String serverUrl) { | |
45 System.out.println("DescribeCollectionServiceImpl.describe"); | |
46 | |
47 Document describe = ClientProtocolUtils.newDescribeCollectionDocument( | |
48 uuid); | |
49 | |
50 HttpClient client = new HttpClientImpl(serverUrl); | |
51 | |
52 try { | |
53 Document response = (Document) client.doCollectionAction( | |
54 describe, uuid, new DocumentResponseHandler()); | |
55 | |
56 Collection c = parseCollection(response); | |
57 | |
58 if (c == null) { | |
59 throw new NullPointerException("No collection returned."); | |
60 } | |
61 | |
62 return c; | |
63 } | |
64 catch (ConnectionException ce) { | |
65 System.err.println(ce.getLocalizedMessage()); | |
66 } | |
67 | |
68 return null; | |
69 } | |
70 | |
71 | |
72 /** | |
73 * This method takes the DESCRIBE document of the Collections describe() | |
74 * operation and extracts the information about the collection itself and | |
75 * the collection items. | |
76 * | |
77 * @param description The DESCRIBE document of the Collections describe() | |
78 * operation. | |
79 * | |
80 * @return a Collection with CollectionItems. | |
81 */ | |
82 protected Collection parseCollection(Document description) { | |
83 System.out.println("AddArtifactServiceImpl.parseCollection"); | |
84 | |
85 if (description == null) { | |
86 System.err.println("The DESCRIBE of the Collection is null!"); | |
87 return null; | |
88 } | |
89 | |
90 String uuid = XMLUtils.xpathString( | |
91 description, | |
92 "art:artifact-collection/@art:uuid", | |
93 ArtifactNamespaceContext.INSTANCE); | |
94 | |
95 if (uuid == null || uuid.equals("")) { | |
96 System.err.println("Found an invalid Collection!"); | |
97 return null; | |
98 } | |
99 | |
100 Collection c = new DefaultCollection(uuid); | |
101 | |
102 NodeList items = (NodeList) XMLUtils.xpath( | |
103 description, | |
104 "art:artifact-collection/art:artifacts/art:artifact", | |
105 XPathConstants.NODESET, | |
106 ArtifactNamespaceContext.INSTANCE); | |
107 | |
108 if (items == null || items.getLength() == 0) { | |
109 System.out.println("No collection item found for this collection."); | |
110 | |
111 return c; | |
112 } | |
113 | |
114 int size = items.getLength(); | |
115 | |
116 for (int i = 0; i < size; i++) { | |
117 CollectionItem item = parseCollectionItem(items.item(i)); | |
118 | |
119 if (item != null) { | |
120 c.addItem(item); | |
121 } | |
122 } | |
123 | |
124 System.out.println( | |
125 "Found " + c.getItemLength() + " collection items " + | |
126 "for the Collection '" + c.identifier() + "'."); | |
127 | |
128 return c; | |
129 } | |
130 | |
131 | |
132 /** | |
133 * This method extracts the CollectionItem from <i>node</i> with its output | |
134 * modes. The output modes are parsed using the parseOutputModes() method. | |
135 * | |
136 * @param node A node that contains information about a CollectionItem. | |
137 * | |
138 * @return a CollectionItem. | |
139 */ | |
140 protected CollectionItem parseCollectionItem(Node node) { | |
141 System.out.println("AddArtifactServiceImpl.parseCollectionItem"); | |
142 | |
143 if (node == null) { | |
144 System.err.println("The node for parsing CollectionItem is null!"); | |
145 return null; | |
146 } | |
147 | |
148 String uuid = XMLUtils.xpathString( | |
149 node, "@art:uuid", ArtifactNamespaceContext.INSTANCE); | |
150 | |
151 String hash = XMLUtils.xpathString( | |
152 node, "@art:hash", ArtifactNamespaceContext.INSTANCE); | |
153 | |
154 if (uuid == null || uuid.equals("")) { | |
155 System.err.println("Found an invalid CollectionItem!"); | |
156 } | |
157 | |
158 Node outputmodes = (Node) XMLUtils.xpath( | |
159 node, | |
160 "art:outputmodes", | |
161 XPathConstants.NODE, | |
162 ArtifactNamespaceContext.INSTANCE); | |
163 | |
164 List<OutputMode> modes = parseOutputModes(outputmodes); | |
165 | |
166 return new DefaultCollectionItem(uuid, hash, modes); | |
167 } | |
168 | |
169 | |
170 /** | |
171 * This method extracts the OutputModes available for a specific | |
172 * CollectionItem and returns them as list. | |
173 * | |
174 * @param node The root node of the outputmodes list. | |
175 * | |
176 * @return a list of OutputModes. | |
177 */ | |
178 protected List<OutputMode> parseOutputModes(Node node) { | |
179 System.out.println("AddArtifactServiceImpl.parseOutputModes"); | |
180 | |
181 if (node == null) { | |
182 System.err.println("The node for parsing OutputModes is null!"); | |
183 return null; | |
184 } | |
185 | |
186 NodeList list = (NodeList) XMLUtils.xpath( | |
187 node, | |
188 "art:output", | |
189 XPathConstants.NODESET, | |
190 ArtifactNamespaceContext.INSTANCE); | |
191 | |
192 if (list == null || list.getLength() == 0) { | |
193 System.err.println("No outputmode nodes found!"); | |
194 return null; | |
195 } | |
196 | |
197 int size = list.getLength(); | |
198 | |
199 List<OutputMode> modes = new ArrayList<OutputMode>(size); | |
200 | |
201 for (int i = 0; i < size; i++) { | |
202 Node tmp = list.item(i); | |
203 String name = XMLUtils.xpathString( | |
204 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE); | |
205 String desc = XMLUtils.xpathString( | |
206 tmp, "@art:description", ArtifactNamespaceContext.INSTANCE); | |
207 String mime = XMLUtils.xpathString( | |
208 tmp, "@art:mime-type", ArtifactNamespaceContext.INSTANCE); | |
209 | |
210 if (name == null || name.equals("")) { | |
211 System.err.println("Found an invalid output mode."); | |
212 | |
213 continue; | |
214 } | |
215 | |
216 // TODO Parse Facets | |
217 | |
218 modes.add(new DefaultOutputMode(name, desc, mime)); | |
219 } | |
220 | |
221 return modes; | |
222 } | |
223 } | |
224 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |