org.geotools.ows.wms

Class WMSUtils

Object

WMSUtils

public class WMSUtils
extends Object

Provides miscellaneous utility methods for use with WMSs.

Author:

Richard Gould

Constructor Summary

Constructors

Constructor and Description
WMSUtils()

Method Summary

Modifier and Type	Method and Description
static Set<String>	findCommonEPSGs(List layers) Given a list of type Layer, return all EPSG codes that is supported by all of the layers.
static Layer[]	getNamedLayers(WMSCapabilities capabilities) Utility method to return each layer that has a name.
static Set	getQueryableLayers(WMSCapabilities capabilities)
static Set	getSRSs(WMSCapabilities capabilities)
static String	matchEPSG(CoordinateReferenceSystem crs, Set codes) Given a CRS and a Set of type String consisting of EPSG CRS codes (such as "EPSG:4326"), it will check the transform that exists between each EPSG code's CRS and the given CRS.

Methods inherited from class Object

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

Constructor Detail

WMSUtils

public WMSUtils()

Method Detail

getNamedLayers

public static Layer[] getNamedLayers(WMSCapabilities capabilities)

Utility method to return each layer that has a name. This method maintains no hierarchy at all.

Returns:

An array of Layers, each value has a it's name property set or an empty array if there are none. It will return null if there is no capabilities document

getQueryableLayers

public static Set getQueryableLayers(WMSCapabilities capabilities)

getSRSs

public static Set getSRSs(WMSCapabilities capabilities)

findCommonEPSGs

public static Set<String> findCommonEPSGs(List layers)

Given a list of type Layer, return all EPSG codes that is supported by all of the layers. This is an intersection of each layer's SRS set.

Parameters:

layers - A List of type Layer

Returns:

a Set of type String, containin EPSG codes, or empty if none found

matchEPSG

public static String matchEPSG(CoordinateReferenceSystem crs,
                               Set codes)

Given a CRS and a Set of type String consisting of EPSG CRS codes (such as "EPSG:4326"), it will check the transform that exists between each EPSG code's CRS and the given CRS. If this is the identity transform, meaning the CRS is equivalent to the EPSG code, the used EPSG code will be returned. The first valid EPSG code found is returned, so it is possibly that multiple valid codes exist.

If no such identity transform can be found, null will be returned.

If this method is succesful, the result is stored in a cache, which is called in subsequent calls.

Parameters:

crs - a CRS that is to be compared to each EPSG code in codes

codes - a Set of type String containing EPSG codes

Returns:

an EPSG code that correspondes to crs, or null if one can't be found