/** * ArcIMSService.java * * @author Stefano Giaccio */package org.wfp.vam.intermap.kernel.map.mapServices.arcims;import java.util.*;import org.jdom.*;import jeeves.utils.Xml;import org.wfp.vam.intermap.kernel.map.mapServices.*;import org.wfp.vam.intermap.kernel.map.mapServices.MapService;import org.wfp.vam.intermap.kernel.map.mapServices.constants.MapServices;public class ArcIMSService extends MapService{		/**	 * Method getGroupImageUrl	 *	 * @param    bBox                a  BoundingBox	 * @param    width               an int	 * @param    height              an int	 * @param    imageNames          a  Vector	 *	 * @return   a String	 *	 */	public String getGroupImageUrl(BoundingBox bBox, int width, int height, Vector imageNames)	{		// TODO		return null;	}		public static final int TYPE = 1;	private BoundingBox bb;	private int activeLayer = 0;	private String errorStr;	private static final double METERS_IN_DEGREE = 111195.0;	private static final double FEET_IN_DEGREE = 364813.0;//	private Hashtable htLayerInfo; // Used to fasten the access to the getServiceInfo response	/**	 * Sets the ArcIMS map server URL and the service name.	 * <p>Also sends a GET_SERVICE_INFO request to the map server and sets the	 * starting visibility for the layers as specified in the response.	 * <p>The GET_SERVICE_INFO response can be retrieved using the toElement	 * method.	 *	 * @param    url                the map server url	 * @param    name               the map service name	 *	 */	public ArcIMSService(String url, String name)		throws Exception	{		super(url, name);		// Send the request to the map server		Element axlRequest = AxlRequestBuilder.getRequest("getServiceInfo.xml");		ArcIMSClient client = new ArcIMSClient(url, name, axlRequest);		Element response = client.getElement();		// Get the LAYERINFO elements		List lLayers = response.getChild("RESPONSE")			.getChild("SERVICEINFO")			.getChildren("LAYERINFO");		// Set the internal id for each layer in the service. We can't use the		// layer name because it maight contain spaces, and Jeeves would throw		// an exception in converting them from HTTP paramerets to elements		int internalId = 1;		for (Iterator i = lLayers.iterator(); i.hasNext(); ) {			Element elLayerInfo = (Element)i.next();			if(activeLayer == 0 && elLayerInfo.getAttributeValue("type").equals("featureclass"))				activeLayer = internalId;			elLayerInfo.setAttribute("internalId", "" + internalId++);//			htLayerInfo.put(new Integer(internalId), elLayerInfo);		}		// Fills the layers Hashtable with the service's layers as key, and		// set set the visible property for each one		for (Iterator i = lLayers.iterator(); i.hasNext(); ) {			Element elLayerInfo = (Element)i.next();			boolean show = elLayerInfo.getAttributeValue("visible").equals("true");			setLayerVisible(elLayerInfo.getAttributeValue("internalId"), show);		}		info = new Element(MapServices.INFO_TAG).addContent(response);		bb = getDefBoundingBox(); // Get the default bounding box	}	public int getType() {		return TYPE;	}	/**	 * Builds a Bounding Box from the envelope tag in the GET_SERVICE_INFO	 * response.	 *	 * @return   The default service envelope	 *	 */	public BoundingBox getDefBoundingBox() throws Exception {		Element elBb = Xml.getElement(info, "/info/ARCXML/RESPONSE/SERVICEINFO/PROPERTIES/ENVELOPE");				float maxy = Float.parseFloat(elBb.getAttributeValue("maxy"));		float miny = Float.parseFloat(elBb.getAttributeValue("miny"));		float maxx = Float.parseFloat(elBb.getAttributeValue("maxx"));		float minx = Float.parseFloat(elBb.getAttributeValue("minx"));		// Convert map units		String units = Xml.getElement(info, "/info/ARCXML/RESPONSE/SERVICEINFO/PROPERTIES/MAPUNITS")			.getAttributeValue("units");		if (units.equals("meters")) {			// Meters to decimal degrees			maxy /= METERS_IN_DEGREE;			miny /= METERS_IN_DEGREE;			maxx /= METERS_IN_DEGREE;			minx /= METERS_IN_DEGREE;		}		if (units.equals("feet")) {			// Feet to decimal degrees			maxy /= FEET_IN_DEGREE;			miny /= FEET_IN_DEGREE;			maxx /= FEET_IN_DEGREE;			minx /= FEET_IN_DEGREE;		}		BoundingBox bb = new BoundingBox(maxy, miny, maxx, minx);		return bb;	}	public BoundingBox getBoundingBox() { return bb; }	/**	 * Sends a GET_IMAGE request to the map server.	 *	 * @param    bBox                a  BoundingBox	 *	 * @return  the URL of the image on the server	 *	 * @throws   Exception	 *	 */	public String getImageUrl(BoundingBox bBox, int width, int height)		throws Exception, ServiceException	{		this.bb = bBox;		// Build the request for the map server		Element elService = this.toElement()			.addContent(new Element("imageWidth").setText(width + ""))			.addContent(new Element("imageHeight").setText(height + ""));		Element request = AxlRequestBuilder.getRequest(elService, "getImage.xsl");		// Send the request and get the response as an Element		ArcIMSClient client = new ArcIMSClient(serverUrl, name, request);		lastResponse = client.getElement();		// Check if an error was generated on the server		checkArcImsError();		// Set the current bounding box from the response		Element elEnvelope = lastResponse.getChild("RESPONSE")			.getChild("IMAGE")			.getChild("ENVELOPE");		bb = new BoundingBox(Float.parseFloat(elEnvelope.getAttributeValue("maxy")),							   Float.parseFloat(elEnvelope.getAttributeValue("miny")),							   Float.parseFloat(elEnvelope.getAttributeValue("maxx")),							   Float.parseFloat(elEnvelope.getAttributeValue("minx")));				// Get the image URL from the ArcXML response		return Xml.getElement(lastResponse, "/ARCXML/RESPONSE/IMAGE/OUTPUT")			.getAttributeValue("url");	}	/**	 * Sends a GET_EXTRACT request to the map server.	 *	 * @param    bBox                a  BoundingBox	 *	 * @return  the URL of the image on the server	 *	 * @throws   Exception	 *	 */	public String getShapefileUrl(BoundingBox bBox, int width, int height)		throws Exception, ServiceException	{		this.bb = bBox;		// Build the request for the map server		Element elService = this.toElement()			.addContent(new Element("imageWidth").setText(width + ""))			.addContent(new Element("imageHeight").setText(height + ""));		Element request = AxlRequestBuilder.getRequest(elService, "getShape.xsl");		// Send the request and get the response as an Element		ArcIMSClient client = new ArcIMSClient(serverUrl, name, "Extract", request);		lastResponse = client.getElement();		// Check if an error was generated on the server		checkArcImsError();				// Get the image URL from the ArcXML response		return Xml.getElement(lastResponse, "/ARCXML/RESPONSE/EXTRACT/OUTPUT")			.getAttributeValue("url");	}		/**	 * Sends a GET_IMAGE request to the map server to get the legend.	 *	 * @param    bBox                a  BoundingBox	 *	 * @return  the URL of the image on the server	 *	 * @throws   Exception	 *	 */	public String getLegendUrl()		throws Exception, ServiceException	{		// Build the request for the map server		Element request = AxlRequestBuilder.getRequest(this.toElement(), "getLegend.xsl");		// Send the request and get the response as an Element		ArcIMSClient client = new ArcIMSClient(serverUrl, name, request);		Element lastResponse =  client.getElement();		checkArcImsError();		// Get the image URL from the ArcXML response		return Xml.getElement(lastResponse, "/ARCXML/RESPONSE/IMAGE/LEGEND")			.getAttributeValue("url");	}	public void identify(int layer, int x, int y, int width, int height, int tolerance, String reqFormat)		throws Exception, ServiceException	{		float mapX = bb.getWest() + (bb.getEast() - bb.getWest()) * x / width;		float mapY = bb.getNorth() - (bb.getNorth() - bb.getSouth()) * y /  height;		float deltax = (bb.getEast() - bb.getWest()) / width * tolerance / 2;		float deltay = (bb.getNorth() - bb.getSouth()) / height * tolerance / 2;		// Build the request for the map server		Element request = AxlRequestBuilder.getRequest(this.toElement()			.addContent(new Element("activeLayer").setText(layer + ""))			.addContent(new BoundingBox(mapY + deltay, mapY - deltay, mapX + deltax, mapX - deltax).toElement()), "identify.xsl");		// Send the request and get the response as an Element		ArcIMSClient client = new ArcIMSClient(serverUrl, name, "Query", request);		lastResponse =  client.getElement();				checkArcImsError();	}	public void setActiveLayer(int layer)		throws Exception	{//		if (!layers.contains(new Integer(layer)))//			throw new Exception();		activeLayer = layer;	}	public int getActiveLayer() {		return activeLayer;	}	/**	 * Sets layer visibility	 *	 * @param    id                  layer id	 * @param    visible             layer visibility	 *	 */	public void setLayerVisible(String id, boolean visible) {		if (visible)			layers.put(id, "show");		else			layers.put(id, "hide");	}	/**	 * Returns an array of all visible layers	 *	 * @return   a Vector	 *	 */	public Vector getVisibleLayers() {		Vector show = new Vector();		for (Enumeration e = layers.keys(); e.hasMoreElements(); ) {			Object key = e.nextElement();			if (layers.get(key) == "show")				show.add(key);		}		return show;	}	/**	 * Returns an element represenation of the status of the map service	 *	 * @return   an Element	 *	 */	public Element toElement() {		// Visible layers		Element elVisible = new Element("visibleLayers");		for (Enumeration e = layers.keys(); e.hasMoreElements(); ) {			Object key = e.nextElement();			if (layers.get(key) == "show")				elVisible.addContent(new Element("layer")										 .setAttribute("internalId", (String)key)										 .setAttribute("visible", "true"));			else				elVisible.addContent(new Element("layer").setAttribute("internalId", (String)key).setAttribute("visible", "false"));		}		return new Element("service")			.setAttribute("type", "ArcIMS")			.setAttribute("name", this.getName())			.addContent(this.getInfo())			.addContent(new Element(MapServices.LAST_RESPONSE_TAG).addContent(this.getLastResponse()))			.addContent(elVisible)			.addContent( new Element("envelope").addContent(getBoundingBox().toElement()) );	}	public String getErrorMsg() {		return errorStr;	}	/**	 * Sets the error string and throws a ServiceException if	 * an error messaged received from the image server	 *	 * @throws   ServiceException if an error messaged received from the image	 *           server	 *	 */	private void checkArcImsError()		throws Exception	{		Element error = Xml.getElement(lastResponse, "/ARCXML/RESPONSE/ERROR");		if (error != null) {			errorStr = error.getText();			throw new ServiceException();		}	}}