    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/portal/standard/sos/control/AbstractSOSListener.java $
    002    /*----------------------------------------------------------------------------
    003     This file is part of deegree, http://deegree.org/
    004     Copyright (C) 2001-2009 by:
    005       Department of Geography, University of Bonn
    006     and
    007       lat/lon GmbH
    008
    009     This library is free software; you can redistribute it and/or modify it under
    010     the terms of the GNU Lesser General Public License as published by the Free
    011     Software Foundation; either version 2.1 of the License, or (at your option)
    012     any later version.
    013     This library is distributed in the hope that it will be useful, but WITHOUT
    014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
    016     details.
    017     You should have received a copy of the GNU Lesser General Public License
    018     along with this library; if not, write to the Free Software Foundation, Inc.,
    019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    020
    021     Contact information:
    022
    023     lat/lon GmbH
    024     Aennchenstr. 19, 53177 Bonn
    025     Germany
    026     http://lat-lon.de/
    027
    028     Department of Geography, University of Bonn
    029     Prof. Dr. Klaus Greve
    030     Postfach 1147, 53001 Bonn
    031     Germany
    032     http://www.geographie.uni-bonn.de/deegree/
    033
    034     e-mail: info@deegree.org
    035    ----------------------------------------------------------------------------*/
    036    package org.deegree.portal.standard.sos.control;
    037
    038    import java.io.InputStreamReader;
    039    import java.net.URL;
    040    import java.util.HashMap;
    041
    042    import org.apache.commons.httpclient.HttpClient;
    043    import org.apache.commons.httpclient.methods.PostMethod;
    044    import org.apache.commons.httpclient.methods.StringRequestEntity;
    045    import org.deegree.enterprise.WebUtils;
    046    import org.deegree.enterprise.control.AbstractListener;
    047    import org.deegree.enterprise.control.FormEvent;
    048    import org.deegree.enterprise.control.RPCMethodCall;
    049    import org.deegree.enterprise.control.RPCWebEvent;
    050    import org.deegree.framework.xml.XMLTools;
    051    import org.deegree.portal.standard.sos.SOSClientException;
    052    import org.deegree.portal.standard.sos.configuration.SOSClientConfiguration;
    053    import org.w3c.dom.Document;
    054
    055    /**
    056     * ...
    057     *
    058     * @author <a href="mailto:taddei@lat-lon.de">Ugo Taddei</a>
    059     *
    060     */
    061    public abstract class AbstractSOSListener extends AbstractListener {
    062
    063        /**
    064         * Validates a request
    065         * @param mc the remote procedure call bean
    066         * @throws SOSClientException
    067         */
    068        protected abstract void validateRequest( RPCMethodCall mc )
    069                                throws SOSClientException;
    070
    071    /**
    072     * Create a request
    073     * @param mc the remote procedure call bean
    074     * @return a String containing the request.
    075     * @throws SOSClientException
    076     */
    077        protected abstract String createRequest( RPCMethodCall mc )
    078                                throws SOSClientException;
    079
    080        /**
    081         * Create a Data from the call and the given map.
    082         * @param mc the remote procedure call bean
    083         * @param map containing the document nodes.
    084         * @return the data bean.
    085         * @throws SOSClientException
    086         */
    087        protected abstract Object createData( RPCMethodCall mc, HashMap<String,Document> map )
    088                                throws SOSClientException;
    089
    090        /**
    091         * sets the parameter as ServletRequest attribute to enable access to the result for the next
    092         * page
    093         *
    094         * @param data
    095         *            param/result
    096         */
    097        protected abstract void setNextPageData( Object data );
    098
    099        @Override
    100        public void actionPerformed( FormEvent e ) {
    101
    102            RPCWebEvent rpcEvent = (RPCWebEvent) e;
    103            RPCMethodCall mc = rpcEvent.getRPCMethodCall();
    104
    105            try {
    106                validateRequest( mc );
    107            } catch ( Exception ex ) {
    108                gotoErrorPage( "Invalid Sensor Observation Service DescribePlatform request: " + ex.toString() );
    109                return;
    110            }
    111
    112            String request = null;
    113            try {
    114                request = createRequest( mc );
    115            } catch ( Exception ex ) {
    116                gotoErrorPage( "Couldn't create Sensor Observation Service DescribePlatform request: " + ex.toString() );
    117                return;
    118            }
    119
    120            HashMap<String, Document> map = null;
    121            try {
    122                map = performRequest( request );
    123            } catch ( Exception ex ) {
    124                gotoErrorPage( "Couldn't perform Sensor Observation Service DescribePlatform request: " + ex.toString() );
    125                return;
    126            }
    127
    128            Object data = null;
    129            try {
    130                data = createData( mc, map );
    131            } catch ( Exception ex ) {
    132                gotoErrorPage( "Couldn't format Sensor Observation Service result: " + ex.toString() );
    133                return;
    134            }
    135
    136            // setParamForNextPage( key, data );
    137            setNextPageData( data );
    138        }
    139
    140        // FIXME make return type a "Map"
    141        protected HashMap<String,Document> performRequest( String request )
    142                                throws SOSClientException {
    143
    144            // FIXME or I'm not sure whether we should return a hash map here. Doc will do too
    145            HashMap<String, Document> map = new HashMap<String, Document>();
    146
    147            SOSClientConfiguration conf = SOSClientConfiguration.getInstance();
    148            String[] sosResources = conf.getSOSNames();
    149            // perform a request for each registered sensor observation service
    150            for ( int i = 0; i < sosResources.length; i++ ) {
    151                URL url = conf.getSOSAddress( sosResources[i] );
    152
    153                try {
    154
    155                    HttpClient httpclient = new HttpClient();
    156                    httpclient = WebUtils.enableProxyUsage( httpclient, url );
    157                    httpclient.getHttpConnectionManager().getParams().setSoTimeout( 30000 );
    158
    159                    PostMethod httppost = new PostMethod( url.toString() );
    160                    StringRequestEntity sre = new StringRequestEntity( request );
    161                    httppost.setRequestEntity( sre );
    162                    httpclient.executeMethod( httppost );
    163
    164                    java.io.InputStream is = httppost.getResponseBodyAsStream();
    165                    InputStreamReader inputStreamRdr = new InputStreamReader( is );
    166                    Document doc = XMLTools.parse( inputStreamRdr );
    167
    168                    map.put( sosResources[i], doc );
    169
    170                } catch ( Exception e ) {
    171                    throw new SOSClientException( "Couldn't connect to Observation Service at " + url.toString(), e );
    172                }
    173            }
    174
    175            return map;
    176        }
    177
    178    }