Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/CapabilitiesParser.java @ 3379:0de61fc9d281
Removed some superfluous casts.
flys-client/trunk@5116 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 24 Jul 2012 08:11:41 +0000 |
parents | 23ffee639f7c |
children | 40d02fbf414d |
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package de.intevation.flys.client.server; import java.io.InputStream; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; 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 org.apache.log4j.Logger; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.flys.client.shared.exceptions.ServerException; import de.intevation.flys.client.shared.model.Capabilities; import de.intevation.flys.client.shared.model.ContactInformation; import de.intevation.flys.client.shared.model.WMSLayer; public class CapabilitiesParser { private static final Logger logger = Logger.getLogger(CapabilitiesParser.class); public static final String ERR_GC_REQUEST_FAILED = "error_gc_req_failed"; public static final String ERR_GC_DOC_NOT_VALID = "error_gc_doc_not_valid"; public static final String ERR_MALFORMED_URL = "error_malformed_url"; public static final String XPATH_WMS_CAPS = "/WMS_Capabilities"; public static final String XPATH_WMT_CAPS = "/WMT_MS_Capabilities"; public static final String XPATH_TITLE = "Service/Title/text()"; public static final String XPATH_ONLINE_RESOURCE = "Service/OnlineResource/@href"; public static final String XPATH_CONTACT_INFORMATION = "Service/ContactInformation"; public static final String XPATH_CI_PERSON = "ContactPersonPrimary/ContactPerson/text()"; public static final String XPATH_CI_ORGANIZATION = "ContactPersonPrimary/ContactOrganization/text()"; public static final String XPATH_CI_ADDRESS = "ContactAddress/Address/text()"; public static final String XPATH_CI_CITY = "ContactAddress/City/text()"; public static final String XPATH_CI_POSTCODE = "ContactAddress/PostCode/text()"; public static final String XPATH_CI_PHONE = "ContactVoiceTelephone/text()"; public static final String XPATH_CI_EMAIL = "ContactElectronicMailAddress/text()"; public static final String XPATH_FEES = "Service/Fees/text()"; public static final String XPATH_ACCESS_CONSTRAINTS = "Service/AccessConstraints/text()"; public static final String XPATH_LAYERS = "Capability/Layer"; public static final Pattern SRS_PATTERN = Pattern.compile("(EPSG:\\d+)*"); private CapabilitiesParser() { } public static void main(String[] args) { logger.info("Do static Capabilities request/parsing."); String log4jProperties = System.getenv(BaseServlet.LOG4J_PROPERTIES); LoggingConfigurator.init(log4jProperties); try { Capabilities caps = getCapabilities(System.getProperty("test.wms")); logger.debug(caps.toString()); } catch (ServerException se) { se.printStackTrace(); } logger.info("Finished fetching capabiltiies."); } public static Capabilities getCapabilities(String urlStr) throws ServerException { try { URL url = new URL(urlStr); logger.debug("Open connection to url: " + urlStr); URLConnection conn = url.openConnection(); conn.connect(); InputStream is = conn.getInputStream(); return parse(is); } catch (MalformedURLException mue) { logger.warn(mue, mue); throw new ServerException(ERR_MALFORMED_URL); } catch (IOException ioe) { logger.warn(ioe, ioe); } throw new ServerException(ERR_GC_REQUEST_FAILED); } protected static Capabilities parse(InputStream is) throws ServerException { logger.debug("GCServiceImpl.parseCapabilitiesResponse"); Document doc = XMLUtils.parseDocument(is, false); if (doc == null) { throw new ServerException(ERR_GC_DOC_NOT_VALID); } return CapabilitiesParser.parse(doc); } public static Capabilities parse(Document doc) throws ServerException { Node capabilities = getCapabilitiesNode(doc); String title = (String) XMLUtils.xpath( capabilities, XPATH_TITLE, XPathConstants.STRING); String onlineResource = (String) XMLUtils.xpath( capabilities, XPATH_ONLINE_RESOURCE, XPathConstants.STRING); String fees = (String) XMLUtils.xpath( capabilities, XPATH_FEES, XPathConstants.STRING); String accessConstraints = (String) XMLUtils.xpath( capabilities, XPATH_ACCESS_CONSTRAINTS, XPathConstants.STRING); Node contactInformation = (Node) XMLUtils.xpath( capabilities, XPATH_CONTACT_INFORMATION, XPathConstants.NODE); ContactInformation ci = parseContactInformation(contactInformation); logger.debug("Found fees: " + fees); logger.debug("Found access constraints: " + accessConstraints); NodeList layerNodes = (NodeList) XMLUtils.xpath( capabilities, XPATH_LAYERS, XPathConstants.NODESET); List<WMSLayer> layers = parseLayers(layerNodes, onlineResource); return new Capabilities( title, onlineResource, ci, fees, accessConstraints, layers); } protected static Node getCapabilitiesNode(Document doc) throws ServerException { Node capabilities = (Node) XMLUtils.xpath( doc, XPATH_WMS_CAPS, XPathConstants.NODE); if (capabilities == null) { logger.info("No '/WMS_Capabilities' node found."); logger.info("Try to find a '/WMT_MS_Capabilities' node."); capabilities = (Node) XMLUtils.xpath( doc, XPATH_WMT_CAPS, XPathConstants.NODE); } if (capabilities == null) { throw new ServerException(ERR_GC_DOC_NOT_VALID); } return capabilities; } protected static ContactInformation parseContactInformation(Node node) { String person = (String) XMLUtils.xpath( node, XPATH_CI_PERSON, XPathConstants.STRING); String organization = (String) XMLUtils.xpath( node, XPATH_CI_ORGANIZATION, XPathConstants.STRING); String address = (String) XMLUtils.xpath( node, XPATH_CI_ADDRESS, XPathConstants.STRING); String postcode = (String) XMLUtils.xpath( node, XPATH_CI_POSTCODE, XPathConstants.STRING); String city = (String) XMLUtils.xpath( node, XPATH_CI_CITY, XPathConstants.STRING); String phone = (String) XMLUtils.xpath( node, XPATH_CI_PHONE, XPathConstants.STRING); String email = (String) XMLUtils.xpath( node, XPATH_CI_EMAIL, XPathConstants.STRING); ContactInformation ci = new ContactInformation(); ci.setPerson(person); ci.setOrganization(organization); ci.setAddress(address); ci.setPostcode(postcode); ci.setCity(city); ci.setPhone(phone); ci.setEmail(email); return ci; } /** * @param layersNode * @param onlineResource * * @return */ protected static List<WMSLayer> parseLayers( NodeList layersNode, String onlineResource ) { int len = layersNode != null ? layersNode.getLength() : 0; logger.debug("Node has " + len + " layers."); List<WMSLayer> layers = new ArrayList<WMSLayer>(len); for (int i = 0; i < len; i++) { layers.add(parseLayer(layersNode.item(i), onlineResource)); } return layers; } protected static WMSLayer parseLayer(Node layerNode, String onlineResource) { String title = (String) XMLUtils.xpath( layerNode, "Title/text()", XPathConstants.STRING); String name = (String) XMLUtils.xpath( layerNode, "Name/text()", XPathConstants.STRING); logger.debug("Found layer: " + title + "(" + name + ")"); List<String> srs = parseSRS(layerNode); NodeList layersNodes = (NodeList) XMLUtils.xpath( layerNode, "Layer", XPathConstants.NODESET); List<WMSLayer> layers = parseLayers(layersNodes, onlineResource); return new WMSLayer(onlineResource, title, name, srs, layers); } protected static List<String> parseSRS(Node layerNode) { NodeList srsNodes = ((Element) layerNode).getElementsByTagName("SRS"); if (srsNodes.getLength() == 0) { srsNodes = ((Element) layerNode).getElementsByTagName("CRS"); if (srsNodes.getLength() == 0) { logger.debug("No explicit SRS for this layer specified."); return null; } } List<String> allSRS = new ArrayList<String>(); for (int i = 0, n = srsNodes.getLength(); i < n; i++) { List<String> srs = parseSRSItem(srsNodes.item(i).getTextContent()); if (srs != null && srs.size() > 0) { allSRS.addAll(srs); } } return allSRS; } protected static List<String> parseSRSItem(String srsStr) { if (srsStr == null || srsStr.length() == 0) { return null; } List<String> allSRS = new ArrayList<String>(); if (srsStr.indexOf(" ") <= 0) { String srs = getSRSFromString(srsStr); if (srs != null && srs.length() > 0) { allSRS.add(srs); } return allSRS; } String[] splittedSrs = srsStr.split(" "); for (String singleSrs: splittedSrs) { String srs = getSRSFromString(singleSrs); if (srs != null && srs.length() > 0) { allSRS.add(srs); } } return allSRS; } protected static String getSRSFromString(String singleSrs) { Matcher m = SRS_PATTERN.matcher(singleSrs); if (m.matches()) { logger.debug("Found SRS '" + m.group(1) + "'"); return m.group(1); } return null; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :