Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/server/GCServiceImpl.java @ 1408:5b5a20e4c4e5
Added a service that loads the Capabilities of a specified WMS - display those information in the ExternalWMSWindow.
flys-client/trunk@3295 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Mon, 21 Nov 2011 12:00:48 +0000 |
| parents | |
| children | ec6e4dad1279 |
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| 1407:ee2875510c12 | 1408:5b5a20e4c4e5 |
|---|---|
| 1 package de.intevation.flys.client.server; | |
| 2 | |
| 3 import java.io.InputStream; | |
| 4 import java.io.IOException; | |
| 5 import java.net.MalformedURLException; | |
| 6 import java.net.URL; | |
| 7 import java.net.URLConnection; | |
| 8 | |
| 9 import javax.xml.xpath.XPathConstants; | |
| 10 | |
| 11 import com.google.gwt.user.server.rpc.RemoteServiceServlet; | |
| 12 | |
| 13 import org.w3c.dom.Document; | |
| 14 | |
| 15 import org.apache.log4j.Logger; | |
| 16 | |
| 17 import de.intevation.artifacts.common.utils.XMLUtils; | |
| 18 | |
| 19 import de.intevation.flys.client.shared.exceptions.ServerException; | |
| 20 import de.intevation.flys.client.shared.model.Capabilities; | |
| 21 import de.intevation.flys.client.client.services.GCService; | |
| 22 | |
| 23 | |
| 24 /** | |
| 25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
| 26 */ | |
| 27 public class GCServiceImpl | |
| 28 extends RemoteServiceServlet | |
| 29 implements GCService | |
| 30 { | |
| 31 public static final String ERR_GC_REQUEST_FAILED = | |
| 32 "error_gc_req_failed"; | |
| 33 | |
| 34 public static final String ERR_GC_DOC_NOT_VALID = | |
| 35 "error_gc_doc_not_valid"; | |
| 36 | |
| 37 public static final String ERR_MALFORMED_URL = | |
| 38 "error_malformed_url"; | |
| 39 | |
| 40 public static final String XPATH_FEES = | |
| 41 "/WMS_Capabilities/Service/Fees/text()"; | |
| 42 | |
| 43 public static final String XPATH_ACCESS_CONSTRAINTS = | |
| 44 "/WMS_Capabilities/Service/AccessConstraints/text()"; | |
| 45 | |
| 46 | |
| 47 private Logger logger = Logger.getLogger(GCServiceImpl.class); | |
| 48 | |
| 49 | |
| 50 public Capabilities query(String path) | |
| 51 throws ServerException | |
| 52 { | |
| 53 logger.info("GCServiceImpl.query"); | |
| 54 | |
| 55 try { | |
| 56 URL url = new URL(path); | |
| 57 | |
| 58 logger.debug("Open connection to url: " + path); | |
| 59 | |
| 60 URLConnection conn = url.openConnection(); | |
| 61 conn.connect(); | |
| 62 | |
| 63 InputStream is = conn.getInputStream(); | |
| 64 | |
| 65 return parseCapabilitiesResponse(is); | |
| 66 } | |
| 67 catch (MalformedURLException mue) { | |
| 68 logger.warn(mue, mue); | |
| 69 throw new ServerException(ERR_MALFORMED_URL); | |
| 70 } | |
| 71 catch (IOException ioe) { | |
| 72 logger.warn(ioe, ioe); | |
| 73 } | |
| 74 | |
| 75 throw new ServerException(ERR_GC_REQUEST_FAILED); | |
| 76 } | |
| 77 | |
| 78 | |
| 79 protected Capabilities parseCapabilitiesResponse(InputStream is) | |
| 80 throws ServerException | |
| 81 { | |
| 82 logger.debug("GCServiceImpl.parseCapabilitiesResponse"); | |
| 83 | |
| 84 Document doc = XMLUtils.parseDocument(is, false); | |
| 85 | |
| 86 if (doc == null) { | |
| 87 throw new ServerException(ERR_GC_DOC_NOT_VALID); | |
| 88 } | |
| 89 | |
| 90 String fees = (String) XMLUtils.xpath( | |
| 91 doc, | |
| 92 XPATH_FEES, | |
| 93 XPathConstants.STRING); | |
| 94 | |
| 95 String accessConstraints = (String) XMLUtils.xpath( | |
| 96 doc, | |
| 97 XPATH_ACCESS_CONSTRAINTS, | |
| 98 XPathConstants.STRING); | |
| 99 | |
| 100 logger.debug("Found fees: " + fees); | |
| 101 logger.debug("Found access constraints: " + accessConstraints); | |
| 102 | |
| 103 // TODO PARSE LAYERS | |
| 104 | |
| 105 return new Capabilities(fees, accessConstraints, null); | |
| 106 } | |
| 107 } | |
| 108 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |