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comparison gnv/src/main/java/de/intevation/gnv/action/mapviewer/parser/XMLExternalCallParser.java @ 402:b88e881e8e94

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Added the first Implementation (not complete and not ready to use) for the Interface from the MapViewer to the GNV gnv/trunk@573 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 19 Jan 2010 14:47:36 +0000
parents
children 15ac78a91d1b
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401:002a4d38c16d 402:b88e881e8e94
1 /**
2 *
3 */
4 package de.intevation.gnv.action.mapviewer.parser;
5
6 import java.io.InputStream;
7 import java.util.ArrayList;
8 import java.util.Collection;
9
10
11 import org.apache.log4j.Logger;
12 import org.w3c.dom.Document;
13 import org.w3c.dom.Element;
14 import org.w3c.dom.NodeList;
15
16 import de.intevation.gnv.artifactdatabase.objects.map.DefaultLayer;
17 import de.intevation.gnv.artifactdatabase.objects.map.DefaultMapService;
18 import de.intevation.gnv.artifactdatabase.objects.map.Layer;
19 import de.intevation.gnv.artifactdatabase.objects.map.MapService;
20 import de.intevation.gnv.util.XMLUtils;
21
22 /**
23 * @author Tim Englich <tim.englich@intevation.de>
24 *
25 */
26 public class XMLExternalCallParser implements ExternalCallParser {
27
28 /**
29 * the logger, used to log exceptions and additonaly information
30 */
31 private static Logger log = Logger.getLogger(XMLExternalCallParser.class);
32
33 private static String XPATH_GEOMETRY = "/gnviewer/location/data";
34 private static String XPATH_SRS = "/gnviewer/location/srs";
35 private static String XPATH_MAPSERVICES_NODESET = "/gnviewer/mapservices/mapservice";
36 private static String XPATH_LAYER = "layer";
37 private static String ATTRIBUTE_ID = "id";
38 private static String ATTRIBUTE_NAME = "name";
39 private static String ATTRIBUTE_TYPE = "type";
40 private static String ATTRIBUTE_URL = "url";
41
42 private String geometry = null;
43 private String srs = null;
44
45 private Collection<MapService> mapServices = null;
46
47 private InputStream inputStream = null;
48
49 /**
50 * Constructor
51 */
52 public XMLExternalCallParser(InputStream inputStream) {
53 this.inputStream = inputStream;
54 }
55
56 /**
57 * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#getGeometry()
58 */
59 public String getGeometry() {
60 return this.geometry;
61 }
62
63 /**
64 * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#getMapServices()
65 */
66 public Collection<MapService> getMapServices() {
67 return this.mapServices;
68 }
69
70 /**
71 * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#parse()
72 */
73 public void parse() throws ExternalCallParserException {
74 if (inputStream != null){
75 XMLUtils xmlUtils = new XMLUtils();
76 Document document = xmlUtils.readDocument(this.inputStream);
77 if (document != null){
78
79 this.geometry = xmlUtils.getStringXPath(document, XPATH_GEOMETRY);
80 this.srs = xmlUtils.getStringXPath(document, XPATH_SRS);
81 NodeList mapservicesNodes =
82 xmlUtils.getNodeSetXPath(document, XPATH_MAPSERVICES_NODESET);
83 if (mapservicesNodes != null){
84 this.mapServices = new ArrayList<MapService>(mapservicesNodes.getLength());
85 for (int i = 0; i < mapservicesNodes.getLength(); i++){
86 Element mapserviceNode = (Element)mapservicesNodes.item(i);
87 String mapserviceID = mapserviceNode.getAttribute(ATTRIBUTE_ID);
88 String mapserviceType = mapserviceNode.getAttribute(ATTRIBUTE_TYPE);
89 String mapserviceUrl = mapserviceNode.getAttribute(ATTRIBUTE_URL);
90 NodeList layerNodes = xmlUtils.getNodeSetXPath(mapserviceNode, XPATH_LAYER);
91 Collection<Layer> layer = null;
92 if (layerNodes != null && layerNodes.getLength() > 0){
93 layer = new ArrayList<Layer>(layerNodes.getLength());
94 layer = this.extractLayer(layer, null, layerNodes);
95 }else{
96 log.debug("No Layer given for this Mapservice");
97 }
98 MapService mapService =
99 new DefaultMapService(mapserviceID, layer,
100 mapserviceType, mapserviceUrl);
101 this.mapServices.add(mapService);
102 }
103
104 }else{
105 String errMsg = "XML-Document does not contain any Mapservices which are required.";
106 log.error(errMsg);
107 throw new ExternalCallParserException(errMsg);
108 }
109
110 }else{
111 String errMsg = "XML-Document could not be read from InputStream.";
112 log.error(errMsg);
113 throw new ExternalCallParserException(errMsg);
114 }
115 }else{
116 String errMsg = "No InputStream given for parsing the Call.";
117 log.error(errMsg);
118 throw new ExternalCallParserException(errMsg);
119 }
120 }
121
122 /**
123 * This Method extracts all Layers and put them into the Collection.
124 * @param layer
125 * @param groupId
126 * @param layerNodes
127 * @return
128 */
129 private Collection<Layer> extractLayer(Collection<Layer> layer, String groupId, NodeList layerNodes){
130 XMLUtils xmlUtils = new XMLUtils();
131 for (int i = 0; i < layerNodes.getLength(); i++){
132 Element layerNode = (Element)layerNodes.item(i);
133 String id = layerNode.getAttribute(ATTRIBUTE_ID);
134 String name = layerNode.getAttribute(ATTRIBUTE_NAME);
135 NodeList localLayerNodes = xmlUtils.getNodeSetXPath(layerNode, XPATH_LAYER);
136 Layer tmpLayer = new DefaultLayer(id, name,
137 (localLayerNodes != null &&
138 localLayerNodes.getLength() > 0),
139 groupId);
140 layer.add(tmpLayer);
141 if (localLayerNodes != null && localLayerNodes.getLength() > 0){
142 layer = this.extractLayer(layer, id, localLayerNodes);
143 }
144 }
145 return layer;
146 }
147
148 /**
149 * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#getSRS()
150 */
151 public String getSRS() {
152 return this.srs;
153 }
154
155 }
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