org.deegree_impl.services.wms
Class GetFeatureInfoHandler_Impl

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

All Implemented Interfaces:

GetFeatureInfoHandler

class GetFeatureInfoHandler_Impl

extends java.lang.Object

implements GetFeatureInfoHandler

Version:

$Revision: 1.1 $

Author:

Andreas Poth

Nested Class Summary

private class

GetFeatureInfoHandler_Impl.ServiceInvoker Inner class for accessing the data of one layer and creating a GML document from it.

Field Summary

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

Constructor Summary

GetFeatureInfoHandler_Impl(WMSCapabilities capabilities, WMSGetFeatureInfoRequest 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 WMSGetFeatureInfoResponse	createExceptionResponse(java.lang.Exception e) creates a WMSGetMapResponse containing an OGCWebServiceException
private WMSGetFeatureInfoResponse	createFeatureInfoResponse() generates the desired output from the GMLs
private CS_CoordinateSystem	createRequestCRS() creates an object that represents the CRS of the GetMap request
protected void	increaseCounter() increases the counter variable that holds the number of services that has sent a response.
WMSGetFeatureInfoResponse	performGetFeatureInfo() performs a GetFeatureInfo request and retruns the result encapsulated within a WMSFeatureInfoResponse object.
protected void	putGML(int index, java.lang.Object o) put a GML document to the passed index of the gml array.
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.
private void	waitForFinish() waits until the requested layers are available as DisplayElements or the time limit has been reached.

Methods inherited from class java.lang.Object

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

Field Detail

request

protected WMSGetFeatureInfoRequest request

getMapRequest

protected WMSGetMapRequest getMapRequest

capabilities

private WMSCapabilities capabilities

gml

private java.lang.Object[] gml

scale

protected double scale

count

private int count

reqCRS

protected CS_CoordinateSystem reqCRS

Constructor Detail

GetFeatureInfoHandler_Impl

public GetFeatureInfoHandler_Impl(WMSCapabilities capabilities,
                                  WMSGetFeatureInfoRequest 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.

performGetFeatureInfo

public WMSGetFeatureInfoResponse performGetFeatureInfo()
                                                throws WebServiceException

performs a GetFeatureInfo request and retruns the result encapsulated within a WMSFeatureInfoResponse 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 (GetFeatureInfo-Request EXCEPTION-Parameter).

Specified by:

performGetFeatureInfo in interface GetFeatureInfoHandler

Returns:

response to the GetFeatureInfo response

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

createExceptionResponse

private WMSGetFeatureInfoResponse createExceptionResponse(java.lang.Exception e)

creates a WMSGetMapResponse containing an OGCWebServiceException

Parameters:

e - exception to encapsulate into the response

waitForFinish

private void waitForFinish()
                    throws WebServiceException,
                           java.lang.Exception

waits until the requested layers are available as DisplayElements or the time limit has been reached. If the waiting is terminated by reaching the time limit an WebServiceException will be thrown to indicated that the request couldn't be performed correctly.

Throws:

WebServiceException - if the time limit has been reached

java.lang.Exception

putGML

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

put a GML document to the passed index of the gml array. The second param passed is a GML document or an exception

createFeatureInfoResponse

private WMSGetFeatureInfoResponse createFeatureInfoResponse()

generates the desired output from the GMLs