Source Code Cross Referenced for WMSService.java in  » GIS » GeoTools-2.4.1 » org » geotools » catalog » wms » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.catalog.wms 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2006-2006, Geotools Project Managment Committee (PMC)
005:         *    (C) 2005, Refractions Research Inc.
006:         *    
007:         *    This library is free software; you can redistribute it and/or
008:         *    modify it under the terms of the GNU Lesser General Public
009:         *    License as published by the Free Software Foundation; either
010:         *    version 2.1 of the License, or (at your option) any later version.
011:         *
012:         *    This library is distributed in the hope that it will be useful,
013:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         *    Lesser General Public License for more details.
016:         */
017:        package org.geotools.catalog.wms;
018:
019:        import java.io.IOException;
020:        import java.net.URI;
021:        import java.net.URL;
022:        import java.util.LinkedList;
023:        import java.util.List;
024:        import java.util.Map;
025:
026:        import org.geotools.catalog.AbstractService;
027:        import org.geotools.catalog.Catalog;
028:        import org.geotools.catalog.ResolveChangeEvent;
029:        import org.geotools.catalog.ResolveDelta;
030:        import org.geotools.catalog.ServiceInfo;
031:        import org.geotools.catalog.defaults.DefaultResolveChangeEvent;
032:        import org.geotools.catalog.defaults.DefaultResolveDelta;
033:        import org.geotools.catalog.defaults.DefaultServiceInfo;
034:        import org.geotools.data.ows.GetCapabilitiesRequest;
035:        import org.geotools.data.ows.GetCapabilitiesResponse;
036:        import org.geotools.data.ows.Layer;
037:        import org.geotools.data.ows.Specification;
038:        import org.geotools.data.ows.WMSCapabilities;
039:        import org.geotools.data.wms.WMS1_0_0;
040:        import org.geotools.data.wms.WMS1_1_0;
041:        import org.geotools.data.wms.WMS1_1_1;
042:        import org.geotools.data.wms.WMSUtils;
043:        import org.geotools.data.wms.WebMapServer;
044:        import org.geotools.data.wms.request.GetFeatureInfoRequest;
045:        import org.geotools.data.wms.request.GetMapRequest;
046:        import org.geotools.data.wms.response.GetFeatureInfoResponse;
047:        import org.geotools.data.wms.response.GetMapResponse;
048:        import org.geotools.data.wms.xml.WMSSchema;
049:        import org.geotools.ows.ServiceException;
050:        import org.geotools.util.ProgressListener;
051:        import org.xml.sax.SAXException;
052:
053:        /**
054:         * Connect to a WMS.
055:         *
056:         * @since 0.6
057:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/plugin/wms/src/main/java/org/geotools/catalog/wms/WMSService.java $
058:         */
059:        public class WMSService extends AbstractService {
060:            /**
061:             * <code>WMS_URL_KEY</code> field Magic param key for Catalog WMS
062:             * persistence.
063:             */
064:            public static final String WMS_URL_KEY = "net.refractions.udig.catalog.internal.wms.WMSServiceImpl.WMS_URL_KEY"; //$NON-NLS-1$
065:            public static final String WMS_WMS_KEY = "net.refractions.udig.catalog.internal.wms.WMSServiceImpl.WMS_WMS_KEY"; //$NON-NLS-1$
066:            private Map params;
067:            private Throwable error;
068:            private URI uri;
069:            private WebMapServer wms = null;
070:            private WMSServiceInfo info;
071:            private List members = null;
072:
073:            /**
074:             * Construct <code>WMSServiceImpl</code>.
075:             *
076:             * @param parent
077:             * @param uri DOCUMENT ME!
078:             * @param params
079:             */
080:            public WMSService(Catalog parent, URI uri, Map params) {
081:                super (parent);
082:                this .params = params;
083:                this .uri = uri;
084:
085:                if (params.containsKey(WMS_WMS_KEY)) {
086:                    Object obj = params.get(WMS_WMS_KEY);
087:
088:                    if (obj instanceof  WebMapServer) {
089:                        this .wms = (WebMapServer) obj;
090:                    }
091:                }
092:            }
093:
094:            public Status getStatus() {
095:                return (error != null) ? Status.BROKEN
096:                        : ((wms == null) ? Status.NOTCONNECTED
097:                                : Status.CONNECTED);
098:            }
099:
100:            /**
101:             * Aquire the actual geotools WebMapServer instance.
102:             * 
103:             * <p>
104:             * Note this method is blocking and throws an IOException to indicate such.
105:             * </p>
106:             *
107:             * @param theUserIsWatching
108:             *
109:             * @return WebMapServer instance
110:             *
111:             * @throws IOException
112:             */
113:            protected WebMapServer getWMS(ProgressListener theUserIsWatching)
114:                    throws IOException {
115:                if (wms == null) {
116:                    try {
117:                        URL url1 = (URL) getConnectionParams().get(WMS_URL_KEY);
118:                        wms = new CustomWMS(url1);
119:                    } catch (IOException persived) {
120:                        error = persived;
121:                        throw persived;
122:                    } catch (Throwable nak) {
123:                        IOException broken = new IOException(
124:                                "Could not connect to WMS. Possible reason: "
125:                                        + nak.getLocalizedMessage());
126:
127:                        broken.initCause(nak);
128:                        error = broken;
129:                        throw broken;
130:                    }
131:
132:                    ResolveDelta delta = new DefaultResolveDelta(this ,
133:                            ResolveDelta.Kind.CHANGED);
134:                    parent(theUserIsWatching)
135:                            .fire(
136:                                    new DefaultResolveChangeEvent(
137:                                            this ,
138:                                            ResolveChangeEvent.Type.POST_CHANGE,
139:                                            delta));
140:                }
141:
142:                return wms;
143:            }
144:
145:            public ServiceInfo getInfo(ProgressListener monitor)
146:                    throws IOException {
147:                if (info == null) {
148:                    synchronized (getWMS(monitor)) {
149:                        if (info == null) {
150:                            info = new WMSServiceInfo(monitor);
151:
152:                            ResolveDelta delta = new DefaultResolveDelta(this ,
153:                                    ResolveDelta.Kind.CHANGED);
154:                            parent(monitor)
155:                                    .fire(
156:                                            new DefaultResolveChangeEvent(
157:                                                    this ,
158:                                                    ResolveChangeEvent.Type.POST_CHANGE,
159:                                                    delta));
160:                        }
161:                    }
162:                }
163:
164:                return info;
165:            }
166:
167:            /*
168:             * @see net.refractions.udig.catalog.IService#resolve(java.lang.Class, org.eclipse.core.runtime.IProgressMonitor)
169:             */
170:            public Object resolve(Class adaptee, ProgressListener monitor)
171:                    throws IOException {
172:                if (adaptee == null) {
173:                    return null;
174:                }
175:
176:                if (adaptee.isAssignableFrom(ServiceInfo.class)) {
177:                    return getInfo(monitor);
178:                }
179:
180:                if (adaptee.isAssignableFrom(List.class)) {
181:                    return members(monitor);
182:                }
183:
184:                if (adaptee.isAssignableFrom(WebMapServer.class)) {
185:                    return getWMS(monitor);
186:                }
187:
188:                return null;
189:            }
190:
191:            /**
192:             * @see net.refractions.udig.catalog.IService#getConnectionParams()
193:             */
194:            public Map getConnectionParams() {
195:                return params;
196:            }
197:
198:            /*
199:             * @see net.refractions.udig.catalog.IResolve#canResolve(java.lang.Class)
200:             */
201:            public boolean canResolve(Class adaptee) {
202:                if (adaptee == null) {
203:                    return false;
204:                }
205:
206:                if (adaptee.isAssignableFrom(WebMapServer.class)
207:                        || adaptee.isAssignableFrom(ServiceInfo.class)
208:                        || adaptee.isAssignableFrom(List.class)) {
209:                    return true;
210:                }
211:
212:                return false;
213:            }
214:
215:            /*
216:             * @see net.refractions.udig.catalog.IResolve#members(org.eclipse.core.runtime.IProgressMonitor)
217:             */
218:            public List members(ProgressListener monitor) throws IOException {
219:                if (members == null) {
220:                    synchronized (getWMS(monitor)) {
221:                        if (members == null) {
222:                            getWMS(monitor); // load ds
223:                            members = new LinkedList();
224:
225:                            Layer[] layers = WMSUtils.getNamedLayers(getWMS(
226:                                    monitor).getCapabilities());
227:
228:                            /*
229:                             * Retrieved no layers from the WMS - something is wrong,
230:                             * either the WMS doesn't work, or it has no named layers.
231:                             */
232:                            if (layers != null) {
233:                                for (int i = 0; i < layers.length; i++) {
234:                                    /*
235:                                     * suppress layers that have children
236:                                     * TODO some people might not like this behavior
237:                                     *      maybe we should make a preference for it.
238:                                     * TODO should add hasChildren() to geotools
239:                                     */
240:                                    if (layers[i].getChildren().length == 0) {
241:                                        Layer layer = layers[i];
242:                                        members.add(new WMSGeoResource(this ,
243:                                                layer));
244:                                    }
245:                                }
246:                            }
247:                        }
248:                    }
249:                }
250:
251:                return members;
252:            }
253:
254:            /*
255:             * @see net.refractions.udig.catalog.IResolve#getMessage()
256:             */
257:            public Throwable getMessage() {
258:                return error;
259:            }
260:
261:            /*
262:             * @see net.refractions.udig.catalog.IResolve#getIdentifier()
263:             */
264:            public URI getIdentifier() {
265:                return uri;
266:            }
267:
268:            class WMSServiceInfo extends DefaultServiceInfo {
269:                private WMSCapabilities caps = null;
270:
271:                WMSServiceInfo(ProgressListener monitor) {
272:                    try {
273:                        caps = getWMS(monitor).getCapabilities();
274:                    } catch (Throwable t) {
275:                        t.printStackTrace();
276:                        caps = null;
277:                    }
278:
279:                    keywords = (caps == null) ? null
280:                            : ((caps.getService() == null) ? null : caps
281:                                    .getService().getKeywordList());
282:
283:                    String[] t;
284:
285:                    if (keywords == null) {
286:                        t = new String[2];
287:                    } else {
288:                        t = new String[keywords.length + 2];
289:                        System.arraycopy(keywords, 0, t, 2, keywords.length);
290:                    }
291:
292:                    t[0] = "WMS"; //$NON-NLS-1$
293:                    t[1] = getIdentifier().toString();
294:                    keywords = t;
295:                }
296:
297:                public String getAbstract() {
298:                    return (caps == null) ? null
299:                            : ((caps.getService() == null) ? null : caps
300:                                    .getService().get_abstract());
301:                }
302:
303:                public String getDescription() {
304:                    return getIdentifier().toString();
305:                }
306:
307:                public URI getSchema() {
308:                    return WMSSchema.NAMESPACE;
309:                }
310:
311:                public URI getSource() {
312:                    return getIdentifier();
313:                }
314:
315:                public String getTitle() {
316:                    return ((caps == null) || (caps.getService() == null)) ? ((getIdentifier() == null) ? "BROKEN" //$NON-NLS-1$
317:                            : getIdentifier().toString())
318:                            : caps.getService().getTitle();
319:                }
320:            }
321:
322:            public class CustomWMS extends WebMapServer {
323:                /**
324:                 * DOCUMENT ME!
325:                 *
326:                 * @param serverURL
327:                 *
328:                 * @throws IOException
329:                 * @throws ServiceException
330:                 * @throws SAXException
331:                 */
332:                public CustomWMS(URL serverURL) throws IOException,
333:                        ServiceException, SAXException {
334:                    super (serverURL);
335:
336:                    if (getCapabilities() == null) {
337:                        throw new IOException(
338:                                "Unable to parse capabilities document."); //$NON-NLS-1$
339:                    }
340:                }
341:
342:                public GetCapabilitiesResponse issueRequest(
343:                        GetCapabilitiesRequest arg0) throws IOException,
344:                        ServiceException {
345:                    return super .issueRequest(arg0);
346:                }
347:
348:                public GetFeatureInfoResponse issueRequest(
349:                        GetFeatureInfoRequest arg0) throws IOException,
350:                        ServiceException {
351:                    return super .issueRequest(arg0);
352:                }
353:
354:                public GetMapResponse issueRequest(GetMapRequest arg0)
355:                        throws IOException, ServiceException {
356:                    return super .issueRequest(arg0);
357:                }
358:
359:                protected void setupSpecifications() {
360:                    specs = new Specification[3];
361:                    specs[0] = new WMS1_0_0();
362:                    specs[1] = new WMS1_1_0();
363:                    specs[2] = new WMS1_1_1();
364:                }
365:            }
366:        }
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