Mercurial > dive4elements > river
changeset 219:7523faf567e5
Implemented a service to fetch distance information of a river from the artifact server.
flys-client/trunk@1662 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
---|---|
date | Mon, 11 Apr 2011 14:32:36 +0000 |
parents | 79fb4d900643 |
children | 35094660f91a |
files | flys-client/ChangeLog flys-client/src/main/java/de/intevation/flys/client/client/services/DistanceInfoService.java flys-client/src/main/java/de/intevation/flys/client/client/services/DistanceInfoServiceAsync.java flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java flys-client/src/main/webapp/WEB-INF/web.xml |
diffstat | 5 files changed, 224 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
--- a/flys-client/ChangeLog Mon Apr 11 14:29:54 2011 +0000 +++ b/flys-client/ChangeLog Mon Apr 11 14:32:36 2011 +0000 @@ -1,3 +1,13 @@ +2011-04-11 Ingo Weinzierl <ingo@intevation.de> + + * src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java, + src/main/java/de/intevation/flys/client/client/services/DistanceInfoServiceAsync.java, + src/main/java/de/intevation/flys/client/client/services/DistanceInfoService.java: + New. This service fetches river specific distance information from + server. + + * src/main/webapp/WEB-INF/web.xml: Registered the DistanceInfoService. + 2011-04-11 Ingo Weinzierl <ingo@intevation.de> * src/main/java/de/intevation/flys/client/shared/model/DistanceInfoObjectImpl.java,
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/client/services/DistanceInfoService.java Mon Apr 11 14:32:36 2011 +0000 @@ -0,0 +1,24 @@ +package de.intevation.flys.client.client.services; + +import com.google.gwt.user.client.rpc.RemoteService; +import com.google.gwt.user.client.rpc.RemoteServiceRelativePath; + +import de.intevation.flys.client.shared.exceptions.ServerException; +import de.intevation.flys.client.shared.model.DistanceInfoObject; + +/** + * This service is used to fetch a list of DistanceInfoObjects from artifact + * server for a specific river. + * + * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> + */ +@RemoteServiceRelativePath("distanceinfo") +public interface DistanceInfoService extends RemoteService { + + /** + * This method returns a list of DistanceInfoObjects for a specific river. + */ + DistanceInfoObject[] getDistanceInfo(String serverUrl, String river) + throws ServerException; +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/client/services/DistanceInfoServiceAsync.java Mon Apr 11 14:32:36 2011 +0000 @@ -0,0 +1,18 @@ +package de.intevation.flys.client.client.services; + +import com.google.gwt.user.client.rpc.AsyncCallback; + +import de.intevation.flys.client.shared.model.DistanceInfoObject; + + +/** + * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> + */ +public interface DistanceInfoServiceAsync { + + void getDistanceInfo( + String url, + String river, + AsyncCallback<DistanceInfoObject[]> cb); +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java Mon Apr 11 14:32:36 2011 +0000 @@ -0,0 +1,161 @@ +package de.intevation.flys.client.server; + +import java.util.ArrayList; +import java.util.List; + +import javax.xml.xpath.XPathConstants; + +import org.w3c.dom.Document; +import org.w3c.dom.Element; +import org.w3c.dom.Node; +import org.w3c.dom.NodeList; + +import com.google.gwt.user.server.rpc.RemoteServiceServlet; + +import de.intevation.artifacts.common.ArtifactNamespaceContext; +import de.intevation.artifacts.common.utils.XMLUtils; + +import de.intevation.artifacts.httpclient.exceptions.ConnectionException; +import de.intevation.artifacts.httpclient.http.HttpClient; +import de.intevation.artifacts.httpclient.http.HttpClientImpl; + +import de.intevation.flys.client.shared.exceptions.ServerException; +import de.intevation.flys.client.client.services.DistanceInfoService; +import de.intevation.flys.client.shared.model.DistanceInfoObject; +import de.intevation.flys.client.shared.model.DistanceInfoObjectImpl; + + +/** + * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> + */ +public class DistanceInfoServiceImpl +extends RemoteServiceServlet +implements DistanceInfoService +{ + public static final String ERROR_NO_DISTANCEINFO_FOUND = + "error_no_distanceinfo_found"; + + public static final String XPATH_DISTANCES = "art:distances/art:distance"; + + + public DistanceInfoObject[] getDistanceInfo(String url, String river) + throws ServerException + { + System.out.println("DistanceInfoServiceImpl.getDistanceInfo"); + + Document doc = XMLUtils.newDocument(); + + XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( + doc, + ArtifactNamespaceContext.NAMESPACE_URI, + ArtifactNamespaceContext.NAMESPACE_PREFIX); + + Element riverEl = ec.create("river"); + + riverEl.setTextContent(river); + + doc.appendChild(riverEl); + + HttpClient client = new HttpClientImpl(url); + + try { + Document result = client.callService(url, "distanceinfo", doc); + + System.out.println("Extract distance info objects now."); + DistanceInfoObject[] objects = extractDistanceInfoObjects(result); + + if (objects != null && objects.length > 0) { + return objects; + } + } + catch (ConnectionException ce) { + System.err.println(ce.getLocalizedMessage()); + } + + throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); + } + + + /** + * Extracts all distance info objects from <i>result</i> document. + * + * @param result The document retrieved by the server. + * + * @return a list of DistanceInfoObjects. + */ + protected DistanceInfoObject[] extractDistanceInfoObjects(Document result) + throws ServerException + { + NodeList list = (NodeList) XMLUtils.xpath( + result, + XPATH_DISTANCES, + XPathConstants.NODESET, + ArtifactNamespaceContext.INSTANCE); + + if (list == null || list.getLength() == 0) { + System.err.println("No distance info found."); + + throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); + } + + int num = list.getLength(); + System.out.println("Response contains " + num + " objects."); + + List<DistanceInfoObject> objects = + new ArrayList<DistanceInfoObject>(num); + + for (int i = 0; i < num; i++) { + DistanceInfoObject obj = buildDistanceInfoObject(list.item(i)); + + if (obj != null) { + objects.add(obj); + } + } + + System.out.println("Retrieved " + objects.size() + " distances."); + + return (DistanceInfoObject[]) + objects.toArray(new DistanceInfoObject[num]); + } + + + /** + * Extracts information for a single distance info object and intializes an + * DistanceInfoObject with them. + * + * @param node The node that contains the information. + * + * @return a valid DistanceInfoObject. + */ + protected DistanceInfoObject buildDistanceInfoObject(Node node) { + String desc = XMLUtils.xpathString( + node, "@art:description", ArtifactNamespaceContext.INSTANCE); + + String from = XMLUtils.xpathString( + node, "@art:from", ArtifactNamespaceContext.INSTANCE); + + String to = XMLUtils.xpathString( + node, "@art:to", ArtifactNamespaceContext.INSTANCE); + + String riverside = XMLUtils.xpathString( + node, "@art:riverside", ArtifactNamespaceContext.INSTANCE); + + if (desc != null && from != null) { + try { + return new DistanceInfoObjectImpl( + desc, + new Double(from), + to != null && to.trim().length() > 0 ? new Double(to) : null, + riverside); + } + catch (NumberFormatException nfe) { + System.err.println(nfe.getLocalizedMessage()); + } + } + + System.err.println("Invalid distance info object found."); + + return null; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
--- a/flys-client/src/main/webapp/WEB-INF/web.xml Mon Apr 11 14:29:54 2011 +0000 +++ b/flys-client/src/main/webapp/WEB-INF/web.xml Mon Apr 11 14:32:36 2011 +0000 @@ -95,6 +95,17 @@ <servlet-name>user-collections</servlet-name> <url-pattern>/flys/user-collections</url-pattern> </servlet-mapping> + + <servlet> + <servlet-name>distanceinfo</servlet-name> + <servlet-class>de.intevation.flys.client.server.DistanceInfoServiceImpl</servlet-class> + </servlet> + + <servlet-mapping> + <servlet-name>distanceinfo</servlet-name> + <url-pattern>/flys/distanceinfo</url-pattern> + </servlet-mapping> + <servlet> <servlet-name>ChartOutputService</servlet-name>