--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gnv/src/main/java/de/intevation/gnv/action/mapviewer/parser/XMLExternalCallParser.java	Tue Jan 19 14:47:36 2010 +0000
@@ -0,0 +1,155 @@
+/**
+ *
+ */
+package de.intevation.gnv.action.mapviewer.parser;
+
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collection;
+
+
+import org.apache.log4j.Logger;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+
+import de.intevation.gnv.artifactdatabase.objects.map.DefaultLayer;
+import de.intevation.gnv.artifactdatabase.objects.map.DefaultMapService;
+import de.intevation.gnv.artifactdatabase.objects.map.Layer;
+import de.intevation.gnv.artifactdatabase.objects.map.MapService;
+import de.intevation.gnv.util.XMLUtils;
+
+/**
+ * @author Tim Englich <tim.englich@intevation.de>
+ *
+ */
+public class XMLExternalCallParser implements ExternalCallParser {
+    
+    /**
+     * the logger, used to log exceptions and additonaly information
+     */
+    private static Logger log = Logger.getLogger(XMLExternalCallParser.class);
+    
+    private static String XPATH_GEOMETRY = "/gnviewer/location/data";
+    private static String XPATH_SRS = "/gnviewer/location/srs";
+    private static String XPATH_MAPSERVICES_NODESET = "/gnviewer/mapservices/mapservice";
+    private static String XPATH_LAYER = "layer";
+    private static String ATTRIBUTE_ID = "id";
+    private static String ATTRIBUTE_NAME = "name";
+    private static String ATTRIBUTE_TYPE = "type";
+    private static String ATTRIBUTE_URL = "url";
+    
+    private String geometry = null;
+    private String srs = null;
+    
+    private Collection<MapService> mapServices = null;
+    
+    private InputStream inputStream = null;
+
+    /**
+     * Constructor
+     */
+    public XMLExternalCallParser(InputStream inputStream) {
+        this.inputStream = inputStream;
+    }
+
+    /**
+     * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#getGeometry()
+     */
+    public String getGeometry() {
+        return this.geometry;
+    }
+
+    /**
+     * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#getMapServices()
+     */
+    public Collection<MapService> getMapServices() {
+        return this.mapServices;
+    }
+
+    /**
+     * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#parse()
+     */
+    public void parse() throws ExternalCallParserException {
+        if (inputStream != null){
+            XMLUtils xmlUtils = new XMLUtils();
+            Document document = xmlUtils.readDocument(this.inputStream);
+            if (document != null){
+                
+                this.geometry = xmlUtils.getStringXPath(document, XPATH_GEOMETRY);
+                this.srs = xmlUtils.getStringXPath(document, XPATH_SRS);
+                NodeList mapservicesNodes = 
+                      xmlUtils.getNodeSetXPath(document, XPATH_MAPSERVICES_NODESET);
+                if (mapservicesNodes != null){
+                    this.mapServices = new ArrayList<MapService>(mapservicesNodes.getLength());
+                    for (int i = 0; i < mapservicesNodes.getLength(); i++){
+                        Element mapserviceNode = (Element)mapservicesNodes.item(i);
+                        String mapserviceID = mapserviceNode.getAttribute(ATTRIBUTE_ID);
+                        String mapserviceType = mapserviceNode.getAttribute(ATTRIBUTE_TYPE);
+                        String mapserviceUrl = mapserviceNode.getAttribute(ATTRIBUTE_URL);
+                        NodeList layerNodes = xmlUtils.getNodeSetXPath(mapserviceNode, XPATH_LAYER);
+                        Collection<Layer> layer = null;
+                        if (layerNodes != null && layerNodes.getLength() > 0){
+                            layer = new  ArrayList<Layer>(layerNodes.getLength());
+                            layer = this.extractLayer(layer, null, layerNodes);
+                        }else{
+                            log.debug("No Layer given for this Mapservice");
+                        }
+                        MapService mapService = 
+                             new DefaultMapService(mapserviceID, layer,
+                                                   mapserviceType, mapserviceUrl);
+                        this.mapServices.add(mapService);
+                    }
+                    
+                }else{
+                    String errMsg = "XML-Document does not contain any Mapservices which are required.";
+                    log.error(errMsg);
+                    throw new ExternalCallParserException(errMsg);
+                }
+                
+            }else{
+                String errMsg = "XML-Document could not be read from InputStream.";
+                log.error(errMsg);
+                throw new ExternalCallParserException(errMsg);
+            }
+        }else{
+            String errMsg = "No InputStream given for parsing the Call.";
+            log.error(errMsg);
+            throw new ExternalCallParserException(errMsg);
+        }
+    }
+    
+    /**
+     * This Method extracts all Layers and put them into the Collection.
+     * @param layer
+     * @param groupId
+     * @param layerNodes
+     * @return
+     */
+    private Collection<Layer> extractLayer(Collection<Layer> layer, String groupId, NodeList layerNodes){
+        XMLUtils xmlUtils = new XMLUtils();
+        for (int i = 0; i < layerNodes.getLength(); i++){
+            Element layerNode = (Element)layerNodes.item(i);
+            String id = layerNode.getAttribute(ATTRIBUTE_ID);
+            String name = layerNode.getAttribute(ATTRIBUTE_NAME);
+            NodeList localLayerNodes = xmlUtils.getNodeSetXPath(layerNode, XPATH_LAYER);
+            Layer tmpLayer = new DefaultLayer(id, name, 
+                                              (localLayerNodes != null && 
+                                               localLayerNodes.getLength() > 0), 
+                                              groupId);
+            layer.add(tmpLayer);
+            if (localLayerNodes != null && localLayerNodes.getLength() > 0){
+                layer = this.extractLayer(layer, id, localLayerNodes);
+            }
+        }
+        return layer;
+    }
+
+    /**
+     * @see de.intevation.gnv.action.mapviewer.parser.ExternalCallParser#getSRS()
+     */
+    public String getSRS() {
+        return this.srs;
+    }
+
+}