wmsservice.java

联合国农粮署牵头开发的geonetwork源代码最新版

	}
	
	/** Not used yet */
	public void setLayerVisible(String id, boolean visible) { this.visible = visible; }
	
	/** Returns the default bounding box, as in LatLonBoundingBox */
	public BoundingBox getDefBoundingBox() {
		Element elBoundingBox = layerInfo.getChild("LatLonBoundingBox");
		
		if (elBoundingBox != null) {
			float minx = Float.parseFloat(elBoundingBox.getAttributeValue("minx"));
			float miny = Float.parseFloat(elBoundingBox.getAttributeValue("miny"));
			float maxx = Float.parseFloat(elBoundingBox.getAttributeValue("maxx"));
			float maxy = Float.parseFloat(elBoundingBox.getAttributeValue("maxy"));
			
			return new BoundingBox(maxy, miny, maxx, minx);
		}
		else return new BoundingBox();
	}
	
	/** Returns the current BoundingBox */
	public BoundingBox getBoundingBox() { return bb; }
	
	/** Not used yet */
	public Vector getVisibleLayers() {
		Vector v = new Vector();
		if (visible)
			v.add(new Integer(1));
		return v;
	}
	
	/** Returns the legend for the currently selected style, as in the Style element */
	public String getLegendUrl() throws Exception {
		if (wmsVer.startsWith("1.1")) // 1.0 documentation was no clear for the legend URL
		{
			Namespace ns = org.jdom.Namespace.getNamespace("xlink", "http://www.w3.org/1999/xlink");
			List styles = layerInfo.getChildren("Style");
			for (Iterator i = styles.iterator(); i.hasNext(); ) {
				Element elStyle = (Element)i.next();
				if (elStyle.getChildText("Name").equals(style))
					try {
						return  elStyle.getChild("LegendURL")
							.getChild("OnlineResource").getAttributeValue("href", ns); // null if no legend
					}
				catch (Exception e) {} // LegendUrl is optional, so JDOM throws an exception if he doesn't find it,
				// but we just return null
			}
		}
		
		return null;
	}
	
	/** Converts this service into a Jdom Element, to be used by the Jeeves Map service */
	public Element toElement() {
		Element elService = new Element("service")
			.setAttribute("type", "WMS")
			.setAttribute("name", getName())
			.addContent(getInfo())
			.addContent(new Element(MapServices.LAST_RESPONSE_TAG).addContent(getLastResponse()));
		
		if (style != null)
			elService.setAttribute("style", style);
		
		// add selected extents information
		Element extents = new Element("selectedExtents");
		for (Enumeration e = htExtents.keys(); e.hasMoreElements(); ) {
			String key = (String)e.nextElement();
			String value = (String)htExtents.get(key);
			extents.addContent(new Element(key).setText(value));
		}
		
		elService.addContent(extents);
		
		return elService;
	}
	
	/** Useless for WMS layers */
	public void setActiveLayer(int layer) throws Exception {}
	
	/** Sets the style for this service */
	public void setStyle(String style) { this.style = style; }
	
	public String getTitle() {
		return layerInfo.getChildText("Title");
	}
	
//	private Element getLayerInfo(String name, Element capabilities) {
//		List layers = capabilities.getChild("Capability").getChildren("Layer");
//		return findLayerInfo(name, layers);
//	}
//
//	private Element findLayerInfo(String name, List layers) {
//		for (Iterator i = layers.iterator(); i.hasNext(); ) {
//			Element layer = (Element)i.next();
//
//			String layerName = layer.getChildText("Name");
//			if (layerName != null && layerName.equals(name))
//				return (Element)layer.clone();
//			else {
//				// Recursively apply this method
//				Element info = findLayerInfo(name, layer.getChildren());
//				if (info != null) return info;
//			}
//		}
//
//		return null; // Layer not found
//	}
	
	public Element getExtents() {
		Extents e = new Extents(layerInfo);
		return e.getJdom();
	}
	
	private void getPrefixes() throws Exception {
		Element request = info.getChild("Capability").getChild("Request");
		if (wmsVer.startsWith("1.1")) {
			// Required requests
			getCapabilitiesPrefix = get11Prefix(request, "GetCapabilities");
			getMapPrefix = get11Prefix(request, "GetMap");
			
			// Optional requests
			try { getFeatureInfoPrefix = get11Prefix(request, "GetFeatureInfo"); } catch (Exception e) {}
			try { describeLayerPrefix = get11Prefix(request, "DescribeLayer"); } catch (Exception e) {}
			try { getLegendGraphicPrefix = get11Prefix(request, "GetLegendGraphic"); } catch (Exception e) {}
			try { getStylesPrefix = get11Prefix(request, "GetStyles"); } catch (Exception e) {}
			try { putStylesPrefix = get11Prefix(request, "PutStyles"); } catch (Exception e) {}
		}
			
		else if (wmsVer.startsWith("1.0")) {
			// Required requests
			getCapabilitiesPrefix = get10Prefix(request, "Capabilities");
			getMapPrefix = get10Prefix(request, "Map");
			
			// Optional requests
			try { getFeatureInfoPrefix = get10Prefix(request, "FeatureInfo"); } catch (Exception e) {}
		}
			
		else throw new Exception();
	}
	
	private String setPrefix(String prefix) {
		if (prefix.indexOf("?") == -1) return prefix + "?";
		else if (!prefix.endsWith("?")) return prefix + "&";
		else return prefix;
	}
	
	private String get11Prefix(Element elRequest, String request) {
		Namespace ns = org.jdom.Namespace.getNamespace("xlink", "http://www.w3.org/1999/xlink");
		return elRequest.getChild(request).getChild("DCPType").getChild("HTTP")
			.getChild("Get").getChild("OnlineResource").getAttributeValue("href", ns);
	}
	
	private String get10Prefix(Element elRequest, String request) {
		return elRequest.getChild(request).getChild("DCPType").getChild("HTTP")
			.getChild("Get").getAttributeValue("onlineResource");
	}
	
	/** Returns one of the image types returned by the server choosing
	 *  from gif, ong and jpeg
	 */
	private String getImageType(Element capabilities) {
		// WmtVer = 1.1.x
		if (wmsVer.startsWith("1.1")) {
			List typesEl = capabilities.getChild("Capability")
				.getChild("Request")
				.getChild("GetMap")
				.getChildren("Format");
			Vector types = new Vector();
			for (Iterator i = typesEl.iterator(); i.hasNext(); )
				types.add(((Element)i.next()).getText());
			if (types.contains("image/png"))
				return "image/png";
			else if (types.contains("image/gif"))
				return "image/gif";
			else
				return "image/jpeg"; // Try jpeg
		}
			
			// WmsVer = 1.0.x
		else if (wmsVer.startsWith("1.0")) {
			List typesEl = capabilities.getChild("Capability")
				.getChild("Request")
				.getChild("Map")
				.getChild("Format")
				.getChildren();
			Vector types = new Vector();
			for (Iterator i = typesEl.iterator(); i.hasNext(); )
				types.add(((Element)i.next()).getName());
			if (types.contains("JPEG"))
				return "JPEG";
			else if (types.contains("PNG"))
				return "PNG";
			else if (types.contains("GIF"))
				return "GIF";
			else
				return "JPEG"; // Try jpeg
		}
		
		return "image/jpeg"; // Try to guess jpeg
	}
	
	private static Element toHtml(String s) {
		Vector v = new Vector();
		
		for (StringTokenizer t = new StringTokenizer(s, "\r\n"); t.hasMoreTokens(); ) {
			Text line = new Text(t.nextToken());
			v.add(line);
			v.add(new Element("br"));
		}
		
		return new Element("html").setContent(v);
	}
	

}


//==============================================================================
//=== $Log: WmsService.java,v $
//=== Revision 1.15  2005/11/09 11:39:31  sgiaccio
//=== More fixes to WMS get feature info
//===
//=== Revision 1.14  2005/11/09 10:38:51  sgiaccio
//=== *** empty log message ***
//===
//=== Revision 1.13  2005/11/08 17:01:35  sgiaccio
//=== *** empty log message ***
//===
//=== Revision 1.12  2005/11/08 17:00:07  sgiaccio
//=== Some fix to the identify feature on wms layers.
//===
//=== Revision 1.11  2005/09/21 08:00:19  sgiaccio
//=== Cleaned cache management
//===
//=== Revision 1.10  2005/09/19 16:39:26  sgiaccio
//=== Some code cleaning
//===
//=== Revision 1.9  2005/09/13 10:18:10  ticheler
//=== InterMap version 2.0
//===
//==============================================================================