/*---------------- FILE HEADER ------------------------------------------
This file is part of deegree.
Copyright (C) 2001-2006 by:
EXSE, Department of Geography, University of Bonn
http://www.giub.uni-bonn.de/deegree/
lat/lon GmbH
http://www.lat-lon.de
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; either
version 2.1 of the License, or (at your option) any later version.
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.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Andreas Poth
lat/lon GmbH
Aennchenstr. 19
53115 Bonn
Germany
E-Mail: poth@lat-lon.de
Prof. Dr. Klaus Greve
Department of Geography
University of Bonn
Meckenheimer Allee 166
53115 Bonn
Germany
E-Mail: greve@giub.uni-bonn.de
---------------------------------------------------------------------------*/
package org.deegree.portal.standard.sos.control;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.HashMap;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
import org.deegree.enterprise.control.AbstractListener;
import org.deegree.enterprise.control.FormEvent;
import org.deegree.enterprise.control.RPCMethodCall;
import org.deegree.enterprise.control.RPCWebEvent;
import org.deegree.framework.util.Debug;
import org.deegree.framework.xml.XMLTools;
import org.deegree.portal.standard.sos.SOSClientException;
import org.deegree.portal.standard.sos.configuration.SOSClientConfiguration;
import org.w3c.dom.Document;
/**
* ...
*
* @author <a href="mailto:taddei@lat-lon.de">Ugo Taddei</a>
*
*/
public abstract class AbstractSOSListener extends AbstractListener{
//TODO javadoc
protected abstract void validateRequest( RPCMethodCall mc ) throws SOSClientException;
// TODO javadoc
protected abstract String createRequest( RPCMethodCall mc ) throws SOSClientException;
// TODO javadoc
protected abstract Object createData( RPCMethodCall mc, HashMap map ) throws SOSClientException;
/**
* sets the parameter as ServletRequest attribute to enable access to
* the result for the next page
*
* @param o param/result
*/
protected abstract void setNextPageData( Object data );
public void actionPerformed(FormEvent e) {
RPCWebEvent rpcEvent = (RPCWebEvent)e;
RPCMethodCall mc = rpcEvent.getRPCMethodCall();
try {
validateRequest( mc );
} catch ( Exception ex ) {
gotoErrorPage( "Invalid Sensor Observation Service DescribePlatform request: "
+ ex.toString() );
Debug.debugMethodEnd();
return;
}
String request = null;
try {
request = createRequest( mc );
} catch ( Exception ex ) {
gotoErrorPage( "Couldn't create Sensor Observation Service DescribePlatform request: "
+ ex.toString() );
Debug.debugMethodEnd();
return;
}
HashMap map = null;
try {
map = performRequest( request );
} catch ( Exception ex ) {
gotoErrorPage( "Couldn't perform Sensor Observation Service DescribePlatform request: "
+ ex.toString() );
Debug.debugMethodEnd();
return;
}
Object data = null;
try {
data = createData( mc, map );
} catch ( Exception ex ) {
gotoErrorPage( "Couldn't format Sensor Observation Service result: " + ex.toString() );
Debug.debugMethodEnd();
return;
}
// setParamForNextPage( key, data );
setNextPageData( data );
}
// FIXME make return type a "Map"
protected HashMap performRequest( String request ) throws SOSClientException {
Debug.debugMethodBegin();
// FIXME or I'm not sure whether we should return a hash map here. Doc will do too
HashMap map = new HashMap();
SOSClientConfiguration conf = SOSClientConfiguration.getInstance();
String[] sosResources = conf.getSOSNames();
// perform a request for each registered sensor observation service
for (int i = 0; i < sosResources.length; i++) {
URL url = conf.getSOSAddress( sosResources[i] );
try {
HttpClient httpclient = new HttpClient();
httpclient.setTimeout( 30000 );
PostMethod httppost = new PostMethod( url.toString() );
httppost.setRequestBody( request );
httpclient.executeMethod(httppost);
java.io.InputStream is = httppost.getResponseBodyAsStream();
InputStreamReader inputStreamRdr = new InputStreamReader( is );
Document doc = XMLTools.parse( inputStreamRdr );
map.put( sosResources[i], doc );
} catch (Exception e) {
throw new SOSClientException( "Couldn't connect to " +
"Observation Service at " + url.toString(), e );
}
}
Debug.debugMethodEnd();
return map;
}
}
/* ********************************************************************
Changes to this class. What the people have been up to:
$Log: AbstractSOSListener.java,v $
Revision 1.6 2006/08/29 19:54:14 poth
footer corrected
Revision 1.5 2006/07/12 14:46:18 poth
comment footer added
********************************************************************** */