Source Code Cross Referenced for KvpRequestReaderAdapter.java in  » GIS » GeoServer » org » geoserver » ows » adapters » Java Source Code / Java DocumentationJava Source Code and Java Documentation

001:        /* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
002:         * This code is licensed under the GPL 2.0 license, availible at the root
003:         * application directory.
004:         */
005:        package org.geoserver.ows.adapters;
006:
007:        import org.geoserver.ows.HttpServletRequestAware;
008:        import org.vfny.geoserver.servlets.AbstractService;
009:        import org.vfny.geoserver.util.requests.readers.KvpRequestReader;
010:        import java.lang.reflect.Constructor;
011:        import java.util.Enumeration;
012:        import java.util.HashMap;
013:        import java.util.Map;
014:        import javax.servlet.http.HttpServletRequest;
015:
016:        /**
017:         * Wraps an old style {@link KvpRequestReader} in a new
018:         * {@link org.geoserver.ows.KvpRequestReader}.
019:         * <p>
020:         * This class needs to be defined in a spring context like:
021:         * <pre>
022:         * <code>
023:         *   &lt;bean id="getMapKvpReader" class="org.geoserver.ows.adapters.KvpRequestReaderAdapter"&gt;
024:         *      &lt;!-- first argument is the request class --&gt;
025:         *      &lt;constructor-arg index="0" value="org.vfny.geoserver.wms.requests.GetMapRequest" /&gt;
026:         *
027:         *      &lt;!-- second argument is the old style kvp reader class --&gt;
028:         *      &lt;constructor-arg index="1" value="org.vfny.geoserver.wms.requests.GetMapKvpReader" /&gt;
029:         *
030:         *      &lt;!-- third argument is the old style service --&gt;
031:         *      &lt;constructor-arg index="2" ref="wmsService" /&gt;
032:         *   &lt;bean&gt;
033:         * </code>
034:         * </pre>
035:         * </p>
036:         *
037:         * @author Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org
038:         *
039:         */
040:        public class KvpRequestReaderAdapter extends
041:                org.geoserver.ows.KvpRequestReader implements 
042:                HttpServletRequestAware {
043:            Class delegateClass;
044:            AbstractService service;
045:            HttpServletRequest request;
046:
047:            public KvpRequestReaderAdapter(Class requestBean,
048:                    Class delegateClass, AbstractService service) {
049:                super (requestBean);
050:                this .delegateClass = delegateClass;
051:                this .service = service;
052:            }
053:
054:            public void setHttpRequest(HttpServletRequest request) {
055:                this .request = request;
056:            }
057:
058:            public Object createRequest() throws Exception {
059:                //simulate the old kvp processin
060:                Map kvp = new HashMap();
061:                String paramName;
062:                String paramValue;
063:
064:                for (Enumeration pnames = request.getParameterNames(); pnames
065:                        .hasMoreElements();) {
066:                    paramName = (String) pnames.nextElement();
067:                    paramValue = request.getParameter(paramName);
068:                    kvp.put(paramName.toUpperCase(), paramValue);
069:                }
070:
071:                //look for a constructor, may have to walk up teh class hierachy
072:                Class clazz = service.getClass();
073:                Constructor constructor = null;
074:
075:                while (clazz != null) {
076:                    try {
077:                        constructor = delegateClass.getConstructor(new Class[] {
078:                                Map.class, clazz });
079:
080:                        break;
081:                    } catch (NoSuchMethodException e) {
082:                        clazz = clazz.getSuperclass();
083:                    }
084:                }
085:
086:                if (constructor == null) {
087:                    throw new IllegalStateException(
088:                            "No appropriate constructor");
089:                }
090:
091:                //create an instance of the delegate	
092:                KvpRequestReader delegate = (KvpRequestReader) constructor
093:                        .newInstance(new Object[] { kvp, service });
094:
095:                //create the request object
096:                return delegate.getRequest(request);
097:            }
098:
099:            public Object read(Object request, Map kvp, Map rawKvp)
100:                    throws Exception {
101:                //request object already initialized, just send it back
102:                return request;
103:            }
104:        }