This is what I used for the GeoServer community schema version but the approach is equally applicable to any standard edition of GeoServer. In short, this approach intercepts the original GML response from GeoServer before it is returned to the client, transforms the GML into something else using an XSLT file and finally return the modified output to the client. Hope it helps.
/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.geoserver.wfs.xml;
import net.opengis.wfs.BaseRequestType;
import net.opengis.wfs.FeatureCollectionType;
import net.opengis.wfs.GetFeatureType;
import org.eclipse.xsd.XSDSchema;
import org.geoserver.ows.util.RequestUtils;
import org.geoserver.ows.util.ResponseUtils;
import org.geoserver.platform.Operation;
import org.geoserver.platform.ServiceException;
import org.geoserver.wfs.GetFeature;
import org.geoserver.wfs.WFS;
import org.geoserver.wfs.WFSGetFeatureOutputFormat;
import org.geoserver.wfs.xml.v1_1_0.WFSConfiguration;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureType;
import org.geotools.xml.Encoder;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.Name;
import org.vfny.geoserver.global.Data;
import org.vfny.geoserver.global.FeatureTypeInfo;
import org.xml.sax.SAXException;
import java.io.*;
import java.util.*;
public class GML3OutputFormat extends WFSGetFeatureOutputFormat {
WFS wfs;
Data catalog;
WFSConfiguration configuration;
public GML3OutputFormat(WFS wfs, Data catalog, WFSConfiguration configuration) {
super(new HashSet(Arrays.asList(new Object { "gml3", "text/xml; subtype=gml/3.1.1" })));
this.wfs = wfs;
this.catalog = catalog;
this.configuration = configuration;
}
public String getMimeType(Object value, Operation operation) {
return "text/xml; subtype=gml/3.1.1";
}
public String getCapabilitiesElementName() {
return "GML3";
}
protected void write(FeatureCollectionType results, OutputStream output, Operation getFeature)
throws ServiceException, IOException {
List featureCollections = results.getFeature();
//round up the info objects for each feature collection
HashMap /*<String,Set>*/ ns2metas = new HashMap();
for (Iterator fc = featureCollections.iterator(); fc.hasNext()
{
GetFeature.GTHackFeatureCollection features;
features = (GetFeature.GTHackFeatureCollection) fc.next();
AttributeDescriptor descriptor = features.getISOFeatureType();
//load the metadata for the feature type
Name name = descriptor.getName();
String namespaceURI = name.getNamespaceURI();
String localPart = name.getLocalPart();
FeatureTypeInfo meta = catalog.getFeatureTypeInfo(localPart, namespaceURI);
//add it to the map
Set metas = (Set) ns2metas.get(namespaceURI);
if (metas == null) {
metas = new HashSet();
ns2metas.put(namespaceURI, metas);
}
metas.add(meta);
}
XSDSchema schema = configuration.schema();
Encoder encoder = new Encoder(configuration, schema);
//declare wfs schema location
BaseRequestType gft = (BaseRequestType) getFeature.getParameters()[0];
String proxifiedBaseUrl = RequestUtils.proxifiedBaseURL(gft.getBaseUrl(),
wfs.getGeoServer().getProxyBaseUrl());
encoder.setSchemaLocation(org.geoserver.wfs.xml.v1_1_0.WFS.NAMESPACE,
ResponseUtils.appendPath(proxifiedBaseUrl, "schemas/wfs/1.1.0/wfs.xsd"));
String featureType =""; //to record name of the feature type
//declare application schema namespaces
for (Iterator i = ns2metas.entrySet().iterator(); i.hasNext() {
Map.Entry entry = (Map.Entry) i.next();
String namespaceURI = (String) entry.getKey();
Set metas = (Set) entry.getValue();
StringBuffer typeNames = new StringBuffer();
for (Iterator m = metas.iterator(); m.hasNext() {
FeatureTypeInfo meta = (FeatureTypeInfo) m.next();
typeNames.append(meta.getName());
if (m.hasNext()) {
typeNames.append(",");
}
}
featureType = typeNames.toString().substring(typeNames.toString().indexOf(":")+1);
System.out.println("1 "+typeNames.toString()+" Hello");
//set the schema location
encoder.setSchemaLocation(namespaceURI,
ResponseUtils.appendQueryString(proxifiedBaseUrl + "wfs",
"service=WFS&version=1.1.0&request=DescribeFeatureType&typeName="
+ typeNames.toString()));
}
File gmlFile= null;
FileOutputStream fos = null;
DataOutputStream dos = null;
FileInputStream fis = null;
try {
String root = wfs.getData().getDataDirectory().getAbsolutePath();
//write gml to MyFile.xml
//determine xslt location for featureType
Properties xslConf = new Properties();
fis = new FileInputStream(root+"/xsl_conf/xsl_conf.config");
xslConf.load(fis);
fis.close();
String xslLocation ="";
if (xslConf.containsKey(featureType)){
gmlFile= new File(root+"/temp/MyFile"+System.currentTimeMillis()+".xml");
//System.out.println(gmlFile.getAbsolutePath());
fos = new FileOutputStream(gmlFile);
dos=new DataOutputStream(fos);
encoder.encode(results, org.geoserver.wfs.xml.v1_1_0.WFS.FEATURECOLLECTION, dos);
xslLocation = root+"/"+xslConf.getProperty(featureType);
new XSLTTransform(gmlFile,
new File(xslLocation), output).doTransform();
fos.close();
dos.close();
output.close();
gmlFile.delete();
}else{
encoder.encode(results, org.geoserver.wfs.xml.v1_1_0.WFS.FEATURECOLLECTION, output);
}
//do housekeeping
} catch (SAXException e) {
fos.close();
dos.close();
output.close();
gmlFile.delete();
String msg = "Error occurred encoding features";
throw (IOException) new IOException(msg).initCause(e);
}catch (FileNotFoundException ex){
System.out.println("File not found...");
fos.close();
dos.close();
output.close();
gmlFile.delete();
throw new FileNotFoundException();
}
}
}
-----Original Message-----
From: geoserver-users-bounces@lists.sourceforge.net [mailto:geoserver-users-bounces@lists.sourceforge.net] On Behalf Of Emmanuel Séguin
Sent: 19 September 2008 10:42
To: geoserver-users@lists.sourceforge.net
Subject: [Geoserver-users] Adding a servlet filter for XSL transformation on WFS gml
Hi
I have to build a new filter for transforming with a XSL file the WFS gml
result of geoserver.
Could you give me some advice regarding where to put in the filterchain
(acegi, gzip, etc ...) and if you have any clue on how to implement it
considering how the WFS output is sent by geoserver (i'm a little lost with
Dispatchers, Spring and different outputStrategy)
Thanx in advance
Manu
--
View this message in context: http://www.nabble.com/Adding-a-servlet-filter-for-XSL-transformation-on-WFS-gml-tp19569283p19569283.html
Sent from the GeoServer - User mailing list archive at Nabble.com.
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