001 //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/enterprise/servlet/OWSSwitch.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.enterprise.servlet;
037
038 import static java.lang.Double.parseDouble;
039 import static org.deegree.framework.log.LoggerFactory.getLogger;
040 import static org.deegree.framework.util.KVP2Map.toMap;
041
042 import java.util.Enumeration;
043 import java.util.HashMap;
044 import java.util.Map;
045 import java.util.TreeMap;
046
047 import javax.servlet.ServletConfig;
048 import javax.servlet.ServletException;
049 import javax.servlet.ServletRequest;
050 import javax.servlet.ServletResponse;
051 import javax.servlet.http.HttpServlet;
052 import javax.servlet.http.HttpServletRequest;
053 import javax.servlet.http.HttpServletResponse;
054
055 import org.deegree.framework.log.ILogger;
056
057 /**
058 * <code>OWSSwitch</code>
059 *
060 * @author <a href="mailto:schmitz@lat-lon.de">Andreas Schmitz</a>
061 * @author last edited by: $Author: aschmitz $
062 *
063 * @version $Revision: 20118 $, $Date: 2009-10-14 13:28:06 +0200 (Mi, 14 Okt 2009) $
064 */
065 public class OWSSwitch extends HttpServlet {
066
067 static final ILogger LOG = getLogger( OWSSwitch.class );
068
069 private static final long serialVersionUID = 5831555086588516559L;
070
071 private TreeMap<String, Rule> rulesOrder = new TreeMap<String, Rule>();
072
073 private HashMap<Rule, String> addresses = new HashMap<Rule, String>();
074
075 private String defaultAddress;
076
077 @Override
078 public void init( ServletConfig conf )
079 throws ServletException {
080 Enumeration<?> enu = conf.getInitParameterNames();
081
082 while ( enu.hasMoreElements() ) {
083 String name = (String) enu.nextElement();
084 String val = conf.getInitParameter( name );
085
086 if ( name.toLowerCase().startsWith( "rule" ) ) {
087 String[] ss = val.split( "\\s+" );
088 Rule rule = new Rule( ss[0].toUpperCase(), ss[1], ss[2] );
089 if ( ss[3].length() == 0 ) {
090 LOG.logWarning( "You configured an empty address, in the configuration line " + val
091 + ". Is this intended?" );
092 }
093 addresses.put( rule, ss[3] );
094 rulesOrder.put( name, rule );
095 }
096 if ( name.equalsIgnoreCase( "defaultaddress" ) ) {
097 defaultAddress = val;
098 }
099 }
100
101 if ( defaultAddress == null ) {
102 LOG.logError( "You have to specify a default address." );
103 throw new ServletException( "You have to specify a default address." );
104 }
105 if ( addresses.isEmpty() ) {
106 LOG.logError( "You have to specify at least one rule." );
107 throw new ServletException( "You have to specify at least one rule." );
108 }
109 LOG.logInfo( "OWSSwitch servlet initialized successfully." );
110 LOG.logDebug( "Default address is '" + defaultAddress + "'" );
111 if ( LOG.isDebug() ) {
112 for ( Rule key : rulesOrder.values() ) {
113 LOG.logDebug( "Rule '" + key + "' -> '" + addresses.get( key ) + "'" );
114 }
115 }
116 }
117
118 @Override
119 public void service( ServletRequest req, ServletResponse res ) {
120 HttpServletRequest request = (HttpServletRequest) req;
121 HttpServletResponse response = (HttpServletResponse) res;
122
123 Map<String, String> map = toMap( request );
124
125 for ( Rule rule : rulesOrder.values() ) {
126 if ( rule.eval( map ) ) {
127 String loc = addresses.get( rule )
128 + ( request.getQueryString() == null ? "" : ( "?" + request.getQueryString() ) );
129 if ( LOG.isDebug() ) {
130 LOG.logDebug( "Redirecting to address :'" + loc + "'" );
131 }
132 response.setHeader( "Location", loc );
133 response.setStatus( 302 );
134 return;
135 }
136 }
137
138 String loc = defaultAddress + ( request.getQueryString() == null ? "" : ( "?" + request.getQueryString() ) );
139 if ( LOG.isDebug() ) {
140 LOG.logDebug( "Redirecting to default address :'" + loc + "'" );
141 }
142 response.setHeader( "Location", loc );
143 response.setStatus( 302 );
144 }
145
146 static class Rule {
147 String parameter, operation, value;
148
149 double dvalue;
150
151 Rule( String p, String o, String v ) throws ServletException {
152 parameter = p;
153 operation = o;
154 value = v;
155
156 if ( o.equals( "<" ) || o.equals( ">" ) || o.equals( "<=" ) || o.equals( ">=" ) ) {
157 dvalue = parseDouble( v );
158 } else {
159 if ( !o.equals( "=" ) ) {
160 LOG.logError( "The operator '" + o + "' is not implemented." );
161 throw new ServletException( "The operator '" + o + "' is not implemented." );
162 }
163 }
164 }
165
166 boolean eval( Map<String, String> map ) {
167 String val = map.get( parameter );
168 if ( val == null ) {
169 return false;
170 }
171 if ( operation.equals( "=" ) ) {
172 return val.equals( value );
173 }
174
175 double v = parseDouble( val );
176
177 if ( operation.equals( "<" ) ) {
178 return v < dvalue;
179 }
180 if ( operation.equals( ">" ) ) {
181 return v > dvalue;
182 }
183 if ( operation.equals( ">=" ) ) {
184 return v >= dvalue;
185 }
186 if ( operation.equals( "<=" ) ) {
187 return v <= dvalue;
188 }
189 return false;
190 }
191
192 @Override
193 public String toString() {
194 return parameter + " " + operation + " " + value;
195 }
196 }
197
198 }