org.deegree_impl.services.wms
Class GetMapHandler_Impl

java.lang.Object
  org.deegree_impl.services.wms.GetMapHandler_Impl

All Implemented Interfaces:

GetMapHandler

public class GetMapHandler_Impl

extends java.lang.Object

implements GetMapHandler

Version:

$Revision: 1.1 $

Author:

Andreas Poth

Nested Class Summary

private class	GetMapHandler_Impl.ServiceInvokerForNL Inner class for accessing the data of one named layer and creating DisplayElements and a Thrme from it.
private class	GetMapHandler_Impl.ServiceInvokerForUL Inner class for accessing the data of one user layer and creating DisplayElements and a Thrme from it.

Field Summary

private WMSCapabilities	capabilities
private int	count
protected CS_CoordinateSystem	reqCRS
protected WMSGetMapRequest	request
protected double	scale
private java.lang.Object[]	themes

Constructor Summary

GetMapHandler_Impl(WMSCapabilities capabilities, WMSGetMapRequest request)
Creates a new GetMapHandler object.

Method Summary

private double	calcDistance(double lon1, double lat1, double lon2, double lat2) calculates the distance between two points in EPSG:4326 coodinates.
private double	calcScale() calculates the map scale as defined in the OGC WMS 1.1.1 specifications
private CS_CoordinateSystem	createRequestCRS() creates an object that represents the CRS of the GetMap request
private WMSGetMapResponse	createResponse(java.lang.Exception e) creates a WMSGetMapResponse containing an OGCWebServiceException
private UserStyle[]	getStyles(NamedLayer sldLayer) returns the UserStyles assigned to a named layer
protected void	increaseCounter() increases the counter variable that holds the number of services that has sent a response.
OGCWebServiceResponse	performGetMap() performs a GetMap request and retruns the result encapsulated within a WMSGetMapResponse object.
private void	printCopyright(java.awt.Graphics g, int heigth) prints a copyright note at left side of the map bottom.
protected void	putTheme(int index, java.lang.Object o) put a theme to the passed index of the themes array.
private WMSGetMapResponse	renderMap() renders the map from the DisplayElements
private boolean	validate(Layer layer, java.lang.String name) validates if the requested layer matches the conditions of the request if not a WebServiceException will be thrown.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

request

protected WMSGetMapRequest request

themes

private java.lang.Object[] themes

scale

protected double scale

count

private int count

reqCRS

protected CS_CoordinateSystem reqCRS

capabilities

private WMSCapabilities capabilities

Constructor Detail

GetMapHandler_Impl

public GetMapHandler_Impl(WMSCapabilities capabilities,
                          WMSGetMapRequest request)
                   throws WebServiceException

Creates a new GetMapHandler object.

Parameters:

request - request to perform

Method Detail

calcScale

private double calcScale()
                  throws java.lang.Exception

calculates the map scale as defined in the OGC WMS 1.1.1 specifications

Returns:

scale of the map

Throws:

java.lang.Exception

calcDistance

private double calcDistance(double lon1,
                            double lat1,
                            double lon2,
                            double lat2)

calculates the distance between two points in EPSG:4326 coodinates.

createRequestCRS

private CS_CoordinateSystem createRequestCRS()

creates an object that represents the CRS of the GetMap request

increaseCounter

protected void increaseCounter()

increases the counter variable that holds the number of services that has sent a response. All data are available if the counter value equals the number of requested layers.

performGetMap

public OGCWebServiceResponse performGetMap()
                                    throws WebServiceException

performs a GetMap request and retruns the result encapsulated within a WMSGetMapResponse object.

The method throws an WebServiceException that only shall be thrown if an fatal error occurs that makes it imposible to return a result. If something wents wrong performing the request (none fatal error) The exception shall be encapsulated within the response object to be returned to the client as requested (GetMap-Request EXCEPTION-Parameter).

Specified by:

performGetMap in interface GetMapHandler

Returns:

response to the GetMap response

Throws:

WebServiceException

getStyles

private UserStyle[] getStyles(NamedLayer sldLayer)
                       throws WebServiceException

returns the UserStyles assigned to a named layer

Parameters:

sldLayer - layer to get the styles for

Throws:

WebServiceException

validate

private boolean validate(Layer layer,
                         java.lang.String name)
                  throws WebServiceException

validates if the requested layer matches the conditions of the request if not a WebServiceException will be thrown. If the layer matches the request, but isn't able to deviever data for the requested area and/or scale false will be returned. If the layer matches the request and contains data for the requested area and/or scale true will be returned.

Parameters:

layer - layer as defined at the capabilities/configuration

name - name of the layer (must be submitted seperatly because the layer parameter can be null

Throws:

WebServiceException

createResponse

private WMSGetMapResponse createResponse(java.lang.Exception e)

creates a WMSGetMapResponse containing an OGCWebServiceException

Parameters:

e - exception to encapsulate into the response

putTheme

protected void putTheme(int index,
                        java.lang.Object o)

put a theme to the passed index of the themes array. The second param passed is a Theme or an exception

renderMap

private WMSGetMapResponse renderMap()

renders the map from the DisplayElements

printCopyright

private void printCopyright(java.awt.Graphics g,
                            int heigth)

prints a copyright note at left side of the map bottom. The copyright note will be extracted from the WMS capabilities/configuration

Parameters:

g - graphic context of the map

heigth - height of the map in pixel