/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2004-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.data.wms;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import org.geotools.data.ResourceInfo;
import org.geotools.data.ServiceInfo;
import org.geotools.data.ows.AbstractOpenWebService;
import org.geotools.data.ows.CRSEnvelope;
import org.geotools.data.ows.GetCapabilitiesRequest;
import org.geotools.data.ows.GetCapabilitiesResponse;
import org.geotools.data.ows.HTTPClient;
import org.geotools.data.ows.Layer;
import org.geotools.data.ows.OperationType;
import org.geotools.data.ows.Specification;
import org.geotools.data.ows.WMSCapabilities;
import org.geotools.data.wms.request.DescribeLayerRequest;
import org.geotools.data.wms.request.GetFeatureInfoRequest;
import org.geotools.data.wms.request.GetLegendGraphicRequest;
import org.geotools.data.wms.request.GetMapRequest;
import org.geotools.data.wms.request.GetStylesRequest;
import org.geotools.data.wms.request.PutStylesRequest;
import org.geotools.data.wms.response.DescribeLayerResponse;
import org.geotools.data.wms.response.GetFeatureInfoResponse;
import org.geotools.data.wms.response.GetLegendGraphicResponse;
import org.geotools.data.wms.response.GetMapResponse;
import org.geotools.data.wms.response.GetStylesResponse;
import org.geotools.data.wms.response.PutStylesResponse;
import org.geotools.data.wms.xml.WMSSchema;
import org.geotools.geometry.GeneralEnvelope;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.ows.ServiceException;
import org.geotools.referencing.CRS;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.NoSuchAuthorityCodeException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
/**
* WebMapServer is a class representing a WMS. It is used to access the
* Capabilities document and perform requests. It supports multiple versions
* and will perform version negotiation automatically and use the highest
* known version that the server can communicate.
*
* If restriction of versions to be used is desired, this class should be
* subclassed and it's setupSpecifications() method over-ridden. It should
* add which version/specifications are to be used to the specs array. See
* the current implementation for an example.
*
* Example usage:
* <code><pre>
* WebMapServer wms = new WebMapServer("http://some.example.com/wms");
* WMSCapabilities capabilities = wms.getCapabilities();
* GetMapRequest request = wms.getMapRequest();
*
* ... //configure request
*
* GetMapResponse response = (GetMapResponse) wms.issueRequest(request);
*
* ... //extract image from the response
* </pre></code>
*
* @author Richard Gould, Refractions Research
*
*
* @source $URL$
*/
public class WebMapServer extends AbstractOpenWebService<WMSCapabilities,Layer> {
/**
* Class quickly describing Web Map Service.
*
* @author Jody
*/
protected class WMSInfo implements ServiceInfo {
private Set<String> keywords;
private Icon icon;
WMSInfo(){
keywords = new HashSet<String>();
if( capabilities.getService() != null ){
String array[] = capabilities.getService().getKeywordList();
if( array != null ){
keywords.addAll( Arrays.asList( array ));
}
}
keywords.add("WMS");
keywords.add( serverURL.toString() );
URL globe2 = WebMapServer.class.getResource("Globe2.png");
icon = new ImageIcon( globe2 );
}
public String getDescription() {
String description = null;
if (capabilities != null && capabilities.getService() != null) {
description = capabilities.getService().get_abstract();
}
if( description == null ) {
description = "Web Map Server "+ serverURL;
}
return description;
}
public Icon getIcon() {
return icon;
}
public Set<String> getKeywords() {
return keywords;
}
public URI getPublisher() {
try {
return capabilities.getService().getContactInformation().getContactInfo().getOnLineResource().getLinkage();
}
catch( NullPointerException publisherNotAvailable ){
}
try {
return new URI( serverURL.getProtocol()+":"+serverURL.getHost() );
} catch (URISyntaxException e) {
}
return null;
}
/**
* We are a Web Map Service:
* @return WMSSchema.NAMESPACE;
*/
public URI getSchema() {
return WMSSchema.NAMESPACE;
}
/**
* The source of this WMS is the capabilities document.
* <p>
* We make an effort here to look in the capabilities document
* provided for the unambiguous capabilities URI. This covers
* the case where the capabilities document has been cached
* on disk and we are restoring a WebMapServer instance.
*/
public URI getSource() {
try {
URL source = getCapabilities().getRequest().getGetCapabilities().getGet();
return source.toURI();
}
catch( NullPointerException huh ){
}
catch (URISyntaxException e) {
}
try {
return serverURL.toURI();
} catch (URISyntaxException e) {
return null;
}
}
public String getTitle() {
if (capabilities != null && capabilities.getService() != null) {
return capabilities.getService().getTitle();
} else if (serverURL == null) {
return "Unavailable";
} else {
return serverURL.toString();
}
}
}
/**
* Quickly describe a layer.
*
* @author Jody
*/
public class LayerInfo implements ResourceInfo {
private ReferencedEnvelope bounds;
private Set<String> keywords;
private Icon icon;
private Layer layer;
LayerInfo( Layer layer ){
this.layer = layer;
org.opengis.geometry.Envelope env = null;
CoordinateReferenceSystem crs = null;
if (layer.getBoundingBoxes().isEmpty()) {
env = layer.getEnvelope(DefaultGeographicCRS.WGS84);
}
else {
CRSEnvelope bbox;
String epsg4326 = "EPSG:4326";
String epsg4269 = "EPSG:4269";
if (layer.getBoundingBoxes().containsKey(epsg4326)) {
bbox = layer.getBoundingBoxes().get(epsg4326);
} else if (layer.getBoundingBoxes().containsKey(epsg4269)) {
bbox = layer.getBoundingBoxes().get(epsg4269);
} else {
bbox = layer.getBoundingBoxes().values().iterator().next();
}
try {
crs = CRS.decode(bbox.getEPSGCode());
env = new ReferencedEnvelope(bbox.getMinX(), bbox.getMaxX(), bbox.getMinY(),
bbox.getMaxY(), crs);
} catch (NoSuchAuthorityCodeException e) {
crs = DefaultGeographicCRS.WGS84;
env = layer.getEnvelope(crs);
} catch (FactoryException e) {
crs = DefaultGeographicCRS.WGS84;
env = layer.getEnvelope(crs);
}
}
bounds = new ReferencedEnvelope(
env.getMinimum(0), env.getMaximum(0),
env.getMinimum(1), env.getMaximum(1),
crs);
String source = getInfo().getSource().toString();
keywords = new TreeSet<String>();
if (layer.getKeywords() != null) {
List<String> more = Arrays.asList( layer.getKeywords() );
keywords.addAll( more );
}
if( layer.getName() != null ){
keywords.add( layer.getName() );
}
if( layer.getTitle() != null ){
keywords.add( layer.getTitle() );
}
keywords.add( capabilities.getService().getName() );
keywords.add( source );
keywords.addAll( getInfo().getKeywords() );
}
public ReferencedEnvelope getBounds() {
return bounds;
}
public CoordinateReferenceSystem getCRS() {
return bounds.getCoordinateReferenceSystem();
}
public String getDescription() {
String description = layer.get_abstract();
if ( description != null && description.length() != 0) {
return description;
} else {
return getCapabilities().getService().get_abstract();
}
}
public synchronized Icon getIcon() {
if( icon == null ){
URL image = WebMapServer.class.getResource("image.png");
icon = new ImageIcon( image );
if ( layer.getChildren() != null && layer.getChildren().length != 0) {
// Do not request "parent" layer graphics - this kills Mapserver
return icon;
}
OperationType getLegendGraphic = getCapabilities().getRequest().getGetLegendGraphic();
if( getLegendGraphic == null ){
// this wms server does not support legend graphics
return icon;
}
GetLegendGraphicRequest request = createGetLegendGraphicRequest();
request.setLayer( layer.getName() );
request.setWidth("16");
request.setHeight("16");
String desiredFormat = null;
List<String> formats = getLegendGraphic.getFormats();
if (formats.contains("image/png")) {
desiredFormat = "image/png";
}
else if (formats.contains("image/gif")) {
desiredFormat = "image/gif";
}
else {
// there is no format that I am sure we can deal with :-(
// the danger here is requesting PDF from geoserver
// (because everyone wants a PDF legend graphics - wot?)
return icon;
}
request.setFormat(desiredFormat);
request.setStyle("");
URL legendGraphics = request.getFinalURL();
icon = new ImageIcon( legendGraphics );
}
return icon;
}
public Set<String> getKeywords() {
return keywords;
}
public String getName() {
return layer.getName();
}
public URI getSchema() {
return getInfo().getSchema();
}
public String getTitle() {
String title = layer.getTitle();
if (title != null && title.length() != 0) {
return title;
} else {
// often the "root" layer has no title, the service title
// is what is intended
return getCapabilities().getService().getTitle();
}
}
}
/**
* Creates a new WebMapServer from a WMSCapablitiles document.
* <p>
* The implementation assumes that the server is located at:
* capabilities.getRequest().getGetCapabilities().getGet()
*
* @param capabilities
* @throws IOException
* @throws ServiceException
*/
public WebMapServer( WMSCapabilities capabilities ) throws IOException, ServiceException {
super( capabilities, capabilities.getRequest().getGetCapabilities().getGet() );
}
/**
* Creates a new WebMapServer instance and attempts to retrieve the
* Capabilities document specified by serverURL.
*
* @param serverURL a URL that points to the capabilities document of a server
* @throws IOException if there is an error communicating with the server
* @throws ServiceException if the server responds with an error
*/
public WebMapServer( final URL serverURL ) throws IOException, ServiceException {
super(serverURL);
}
/**
* Creates a new WebMapServer instance and attempts to retrieve the
* Capabilities document specified by serverURL.
*
* @param serverURL a URL that points to the capabilities document of a server
* @throws IOException if there is an error communicating with the server
* @throws ServiceException if the server responds with an error
*/
public WebMapServer( final URL serverURL, final HTTPClient httpClient ) throws IOException, ServiceException {
super(serverURL, httpClient, null);
}
/**
* Creates a new WebMapServer instance and attempts to retrieve the
* Capabilities document specified by serverURL.
*
* @param serverURL a URL that points to the capabilities document of a server
* @param timeout a time to be wait a server response
* @throws IOException if there is an error communicating with the server
* @throws ServiceException if the server responds with an error
*/
public WebMapServer( final URL serverURL, int timeout ) throws IOException, ServiceException {
super(serverURL,timeout);
}
/**
* Sets up the specifications/versions that this server is capable of
* communicating with.
*/
protected void setupSpecifications() {
specs = new Specification[4];
specs[0] = new WMS1_0_0();
specs[1] = new WMS1_1_0();
specs[2] = new WMS1_1_1();
specs[3] = new WMS1_3_0();
}
@Override
protected ServiceInfo createInfo() {
return new WMSInfo();
}
protected ResourceInfo createInfo( Layer layer ){
return new LayerInfo( (Layer) layer );
}
public GetCapabilitiesResponse issueRequest(GetCapabilitiesRequest request) throws IOException, ServiceException {
return (GetCapabilitiesResponse) internalIssueRequest(request);
}
public GetMapResponse issueRequest(GetMapRequest request) throws IOException, ServiceException {
return (GetMapResponse) internalIssueRequest(request);
}
public GetFeatureInfoResponse issueRequest(GetFeatureInfoRequest request) throws IOException, ServiceException {
return (GetFeatureInfoResponse) internalIssueRequest(request);
}
public DescribeLayerResponse issueRequest(DescribeLayerRequest request) throws IOException, ServiceException {
return (DescribeLayerResponse) internalIssueRequest(request);
}
public GetLegendGraphicResponse issueRequest(GetLegendGraphicRequest request) throws IOException, ServiceException {
return (GetLegendGraphicResponse) internalIssueRequest(request);
}
public GetStylesResponse issueRequest(GetStylesRequest request) throws IOException, ServiceException {
return (GetStylesResponse) internalIssueRequest(request);
}
public PutStylesResponse issueRequest(PutStylesRequest request) throws IOException, ServiceException {
return (PutStylesResponse) internalIssueRequest(request);
}
/**
* Get the getCapabilities document. If there was an error parsing it
* during creation, it will return null (and it should have thrown an
* exception during creation).
*
* @return a WMSCapabilities object, representing the Capabilities of the server
*/
public WMSCapabilities getCapabilities() {
return (WMSCapabilities) capabilities;
}
private WMSSpecification getSpecification() {
return (WMSSpecification) specification;
}
private URL findURL(OperationType operation) {
if (operation.getGet() != null) {
return operation.getGet();
}
return serverURL;
}
/**
* Creates a GetMapRequest that can be configured and then passed to
* issueRequest().
*
* @return a configureable GetMapRequest object
*/
public GetMapRequest createGetMapRequest() {
URL onlineResource = findURL(getCapabilities().getRequest().getGetMap());
return (GetMapRequest) getSpecification().createGetMapRequest(onlineResource);
}
/**
* Creates a GetFeatureInfoRequest that can be configured and then passed to
* issueRequest().
*
* @param getMapRequest a previous configured GetMapRequest
* @return a GetFeatureInfoRequest
* @throws UnsupportedOperationException if the server does not support GetFeatureInfo
*/
public GetFeatureInfoRequest createGetFeatureInfoRequest( GetMapRequest getMapRequest ) {
if (getCapabilities().getRequest().getGetFeatureInfo() == null) {
throw new UnsupportedOperationException("This Web Map Server does not support GetFeatureInfo requests");
}
URL onlineResource = findURL(getCapabilities().getRequest().getGetFeatureInfo());
GetFeatureInfoRequest request = getSpecification().createGetFeatureInfoRequest(onlineResource,
getMapRequest);
return request;
}
public DescribeLayerRequest createDescribeLayerRequest() throws UnsupportedOperationException {
if (getCapabilities().getRequest().getDescribeLayer() == null ) {
throw new UnsupportedOperationException("Server does not specify a DescribeLayer operation. Cannot be performed");
}
URL onlineResource = getCapabilities().getRequest().getDescribeLayer().getGet();
if (onlineResource == null) {
onlineResource = serverURL;
}
DescribeLayerRequest request = getSpecification().createDescribeLayerRequest(onlineResource);
return request;
}
public GetLegendGraphicRequest createGetLegendGraphicRequest() throws UnsupportedOperationException {
if (getCapabilities().getRequest().getGetLegendGraphic() == null) {
throw new UnsupportedOperationException("Server does not specify a GetLegendGraphic operation. Cannot be performed");
}
URL onlineResource = getCapabilities().getRequest().getGetLegendGraphic().getGet();
if (onlineResource == null) {
onlineResource = serverURL;
}
GetLegendGraphicRequest request = getSpecification().createGetLegendGraphicRequest(onlineResource);
return request;
}
public GetStylesRequest createGetStylesRequest() throws UnsupportedOperationException{
if (getCapabilities().getRequest().getGetStyles() == null) {
throw new UnsupportedOperationException("Server does not specify a GetStyles operation. Cannot be performed");
}
URL onlineResource = getCapabilities().getRequest().getGetStyles().getGet();
if (onlineResource == null) {
onlineResource = serverURL;
}
GetStylesRequest request = getSpecification().createGetStylesRequest(onlineResource);
return request;
}
public PutStylesRequest createPutStylesRequest() throws UnsupportedOperationException {
if (getCapabilities().getRequest().getPutStyles() == null) {
throw new UnsupportedOperationException("Server does not specify a PutStyles operation. Cannot be performed");
}
URL onlineResource = getCapabilities().getRequest().getPutStyles().getGet();
if (onlineResource == null) {
onlineResource = serverURL;
}
PutStylesRequest request = getSpecification().createPutStylesRequest(onlineResource);
return request;
}
/**
* Given a layer and a coordinate reference system, will locate an envelope
* for that layer in that CRS. If the layer is declared to support that CRS,
* but no envelope can be found, it will try to calculate an appropriate
* bounding box.
*
* If null is returned, no valid bounding box could be found and one couldn't
* be transformed from another.
*
* @param layer
* @param crs
* @return an Envelope containing a valid bounding box, or null if none are found
*/
public GeneralEnvelope getEnvelope(Layer layer, CoordinateReferenceSystem crs) {
return layer.getEnvelope(crs);
}
}