/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.geoserver.wcs.response;
import static org.geoserver.ows.util.ResponseUtils.appendQueryString;
import static org.geoserver.ows.util.ResponseUtils.buildSchemaURL;
import static org.geoserver.ows.util.ResponseUtils.buildURL;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
import net.opengis.wcs11.GetCapabilitiesType;
import org.geoserver.catalog.Catalog;
import org.geoserver.catalog.CoverageInfo;
import org.geoserver.catalog.MetadataLinkInfo;
import org.geoserver.config.ContactInfo;
import org.geoserver.config.GeoServer;
import org.geoserver.config.GeoServerInfo;
import org.geoserver.ows.URLMangler.URLType;
import org.geoserver.wcs.WCSInfo;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.util.logging.Logging;
import org.geotools.xml.transform.TransformerBase;
import org.geotools.xml.transform.Translator;
import org.vfny.geoserver.global.CoverageInfoLabelComparator;
import org.vfny.geoserver.wcs.WcsException;
import org.vfny.geoserver.wcs.WcsException.WcsExceptionCode;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
/**
* Based on the <code>org.geotools.xml.transform</code> framework, does the
* job of encoding a WCS 1.1 Capabilities document.
*
* @author Alessio Fabiani (alessio.fabiani@gmail.com)
* @author Simone Giannecchini (simboss1@gmail.com)
* @author Andrea Aime, TOPP
*/
public class WCSCapsTransformer extends TransformerBase {
private static final Logger LOGGER = Logging.getLogger(WCSCapsTransformer.class.getPackage()
.getName());
protected static final String WCS_URI = "http://www.opengis.net/wcs/1.1.1";
protected static final String CUR_VERSION = "1.1.1";
protected static final String XSI_PREFIX = "xsi";
protected static final String XSI_URI = "http://www.w3.org/2001/XMLSchema-instance";
private WCSInfo wcs;
private Catalog catalog;
/**
* Creates a new WFSCapsTransformer object.
*/
public WCSCapsTransformer(GeoServer gs) {
super();
this.wcs = gs.getService(WCSInfo.class);
this.catalog = gs.getCatalog();
setNamespaceDeclarationEnabled(false);
}
public Translator createTranslator(ContentHandler handler) {
return new WCS111CapsTranslator(handler);
}
private class WCS111CapsTranslator extends TranslatorSupport {
/**
* DOCUMENT ME!
*
* @uml.property name="request"
* @uml.associationEnd multiplicity="(0 1)"
*/
private GetCapabilitiesType request;
/**
* Creates a new WFSCapsTranslator object.
*
* @param handler
* DOCUMENT ME!
*/
public WCS111CapsTranslator(ContentHandler handler) {
super(handler, null, null);
}
/**
* Encode the object.
*
* @param o
* The Object to encode.
*
* @throws IllegalArgumentException
* if the Object is not encodeable.
*/
public void encode(Object o) throws IllegalArgumentException {
if (!(o instanceof GetCapabilitiesType)) {
throw new IllegalArgumentException(new StringBuffer("Not a GetCapabilitiesType: ")
.append(o).toString());
}
this.request = (GetCapabilitiesType) o;
// check the update sequence
final long updateSequence = wcs.getGeoServer().getGlobal().getUpdateSequence();
long requestedUpdateSequence = -1;
if (request.getUpdateSequence() != null) {
try {
requestedUpdateSequence = Long.parseLong(request.getUpdateSequence());
} catch (NumberFormatException e) {
throw new WcsException("Invalid update sequence number format, "
+ "should be an integer", WcsExceptionCode.InvalidUpdateSequence,
"updateSequence");
}
if (requestedUpdateSequence > updateSequence) {
throw new WcsException("Invalid update sequence value, it's higher "
+ "than the current value, " + updateSequence,
WcsExceptionCode.InvalidUpdateSequence, "updateSequence");
}
}
final AttributesImpl attributes = new AttributesImpl();
attributes.addAttribute("", "version", "version", "", CUR_VERSION);
attributes.addAttribute("", "xmlns:wcs", "xmlns:wcs", "", WCS_URI);
attributes.addAttribute("", "xmlns:xlink", "xmlns:xlink", "",
"http://www.w3.org/1999/xlink");
attributes.addAttribute("", "xmlns:ogc", "xmlns:ogc", "", "http://www.opengis.net/ogc");
attributes.addAttribute("", "xmlns:ows", "xmlns:ows", "",
"http://www.opengis.net/ows/1.1");
attributes.addAttribute("", "xmlns:gml", "xmlns:gml", "", "http://www.opengis.net/gml");
final String prefixDef = new StringBuffer("xmlns:").append(XSI_PREFIX).toString();
attributes.addAttribute("", prefixDef, prefixDef, "", XSI_URI);
final String locationAtt = new StringBuffer(XSI_PREFIX).append(":schemaLocation")
.toString();
final String locationDef = buildSchemaURL(request.getBaseUrl(), "wcs/1.1.1/wcsGetCapabilities.xsd");
attributes.addAttribute("", locationAtt, locationAtt, "", locationDef);
attributes.addAttribute("", "updateSequence", "updateSequence", "", String
.valueOf(updateSequence));
start("wcs:Capabilities", attributes);
// handle the sections directive
boolean allSections;
List<String> sections;
if (request.getSections() == null) {
allSections = true;
sections = Collections.emptyList();
} else {
sections = request.getSections().getSection();
allSections = sections.contains("All");
}
final Set<String> knownSections = new HashSet<String>(Arrays.asList(
"ServiceIdentification", "ServiceProvider", "OperationsMetadata", "Contents",
"All"));
for (String section : sections) {
if(!knownSections.contains(section))
throw new WcsException("Unknown section " + section,
WcsExceptionCode.InvalidParameterValue, "Sections");
}
// encode the actual capabilities contents taking into consideration
// the sections
if (requestedUpdateSequence < updateSequence) {
if (allSections || sections.contains("ServiceIdentification"))
handleServiceIdentification();
if (allSections || sections.contains("ServiceProvider"))
handleServiceProvider();
if (allSections || sections.contains("OperationsMetadata"))
handleOperationsMetadata();
if (allSections || sections.contains("Contents"))
handleContents();
}
end("wcs:Capabilities");
}
/**
* Handles the service identification of the capabilities document.
*
* @param config
* The OGC service to transform.
*
* @throws SAXException
* For any errors.
*/
private void handleServiceIdentification() {
start("ows:ServiceIdentification");
element("ows:Title", wcs.getTitle());
element("ows:Abstract", wcs.getAbstract());
handleKeywords(wcs.getKeywords());
element("ows:ServiceType", "WCS");
element("ows:ServiceTypeVersion", "1.1.0");
element("ows:ServiceTypeVersion", "1.1.1");
String fees = wcs.getFees();
if ((fees == null) || "".equals(fees)) {
fees = "NONE";
}
element("ows:Fees", fees);
String accessConstraints = wcs.getAccessConstraints();
if ((accessConstraints == null) || "".equals(accessConstraints)) {
accessConstraints = "NONE";
}
element("ows:AccessConstraints", accessConstraints);
end("ows:ServiceIdentification");
}
/**
* Handles the service provider of the capabilities document.
*
* @param config
* The OGC service to transform.
*
* @throws SAXException
* For any errors.
*/
private void handleServiceProvider() {
start("ows:ServiceProvider");
GeoServerInfo gs = wcs.getGeoServer().getGlobal();
element("ows:ProviderName", gs.getContact().getContactOrganization());
AttributesImpl attributes = new AttributesImpl();
attributes.addAttribute("", "xlink:href", "xlink:href", "", gs.getOnlineResource());
element("ows:ProviderSite", null, attributes);
handleContact();
end("ows:ServiceProvider");
}
/**
* Handles the OperationMetadata portion of the document, printing out
* the operations and where to bind to them.
*
* @param config
* The global wms.
*
* @throws SAXException
* For any problems.
*/
private void handleOperationsMetadata() {
start("ows:OperationsMetadata");
handleOperation("GetCapabilities", null);
handleOperation("DescribeCoverage", null);
handleOperation("GetCoverage", new HashMap<String, List<String>>() {
{
put("store", Arrays.asList("True", "False"));
}
});
// specify that we do support xml post encoding, clause 8.3.2.2 of
// the WCS 1.1.1 spec
AttributesImpl attributes = new AttributesImpl();
attributes.addAttribute(null, "name", "name", null, "PostEncoding");
start("ows:Constraint", attributes);
start("ows:AllowedValues");
element("ows:Value", "XML");
end("ows:AllowedValues");
end("ows:Constraint");
end("ows:OperationsMetadata");
}
private void handleOperation(String capabilityName, Map<String, List<String>> parameters) {
AttributesImpl attributes = new AttributesImpl();
attributes.addAttribute(null, "name", "name", null, capabilityName);
start("ows:Operation", attributes);
final String url = appendQueryString(buildURL(request.getBaseUrl(), "wcs", null, URLType.SERVICE), "");
start("ows:DCP");
start("ows:HTTP");
attributes = new AttributesImpl();
attributes.addAttribute("", "xlink:href", "xlink:href", "", url);
element("ows:Get", null, attributes);
end("ows:HTTP");
end("ows:DCP");
attributes = new AttributesImpl();
attributes.addAttribute("", "xlink:href", "xlink:href", "", url);
start("ows:DCP");
start("ows:HTTP");
element("ows:Post", null, attributes);
end("ows:HTTP");
end("ows:DCP");
if (parameters != null && !parameters.isEmpty()) {
for (Map.Entry<String, List<String>> param : parameters.entrySet()) {
attributes = new AttributesImpl();
attributes.addAttribute("", "name", "name", "", param.getKey());
start("ows:Parameter", attributes);
start("ows:AllowedValues");
for (String value : param.getValue()) {
element("ows:Value", value);
}
end("ows:AllowedValues");
end("ows:Parameter");
}
}
end("ows:Operation");
}
/**
* DOCUMENT ME!
*
* @param kwords
* DOCUMENT ME!
*
* @throws SAXException
* DOCUMENT ME!
*/
private void handleKeywords(List kwords) {
if(kwords != null && kwords.size() > 0) {
start("ows:Keywords");
if (kwords != null) {
for (Iterator it = kwords.iterator(); it.hasNext();) {
element("ows:Keyword", it.next().toString());
}
}
end("ows:Keywords");
}
}
/**
* Handles contacts.
*
* @param wcs
* the service.
*/
private void handleContact() {
final GeoServer gs = wcs.getGeoServer();
start("ows:ServiceContact");
ContactInfo contact = gs.getGlobal().getContact();
elementIfNotEmpty("ows:IndividualName", contact.getContactPerson());
elementIfNotEmpty("ows:PositionName", contact.getContactPosition());
start("ows:ContactInfo");
start("ows:Phone");
elementIfNotEmpty("ows:Voice", contact.getContactVoice());
elementIfNotEmpty("ows:Facsimile", contact.getContactFacsimile());
end("ows:Phone");
start("ows:Address");
elementIfNotEmpty("ows:DeliveryPoint", contact.getAddress());
elementIfNotEmpty("ows:City", contact.getAddressCity());
elementIfNotEmpty("ows:AdministrativeArea", contact.getAddressState());
elementIfNotEmpty("ows:PostalCode", contact.getAddressPostalCode());
elementIfNotEmpty("ows:Country", contact.getAddressCountry());
elementIfNotEmpty("ows:ElectronicMailAddress", contact.getContactEmail());
end("ows:Address");
String or = gs.getGlobal().getOnlineResource();
if ((or != null) && !"".equals(or.trim())) {
AttributesImpl attributes = new AttributesImpl();
attributes.addAttribute("", "xlink:href", "xlink:href", "", or);
start("ows:OnlineResource", attributes);
end("OnlineResource");
}
end("ows:ContactInfo");
end("ows:ServiceContact");
}
private void handleEnvelope(ReferencedEnvelope envelope) {
start("ows:WGS84BoundingBox");
element("ows:LowerCorner", new StringBuffer(Double.toString(envelope.getLowerCorner()
.getOrdinate(0))).append(" ").append(envelope.getLowerCorner().getOrdinate(1))
.toString());
element("ows:UpperCorner", new StringBuffer(Double.toString(envelope.getUpperCorner()
.getOrdinate(0))).append(" ").append(envelope.getUpperCorner().getOrdinate(1))
.toString());
end("ows:WGS84BoundingBox");
}
private void handleContents() {
start("wcs:Contents");
List<CoverageInfo> coverages = wcs.getGeoServer().getCatalog().getCoverages();
// filter out disabled coverages
for (Iterator it = coverages.iterator(); it.hasNext();) {
// GR: I don't think we should be removing directly from the list returned by
// Catalog?
CoverageInfo cv = (CoverageInfo) it.next();
if(!cv.enabled())
it.remove();
}
// filter out coverages that are not in the requested namespace
if(request.getNamespace() != null) {
String namespace = request.getNamespace();
for (Iterator it = coverages.iterator(); it.hasNext();) {
CoverageInfo cv = (CoverageInfo) it.next();
if(!namespace.equals(cv.getStore().getWorkspace().getName()))
it.remove();
}
}
Collections.sort(coverages, new CoverageInfoLabelComparator());
for (Iterator i = coverages.iterator(); i.hasNext();) {
CoverageInfo cv = (CoverageInfo) i.next();
if (cv.enabled())
handleCoverageSummary(cv);
}
end("wcs:Contents");
}
private void handleCoverageSummary(CoverageInfo cv) {
start("wcs:CoverageSummary");
elementIfNotEmpty("ows:Title", cv.getTitle());
elementIfNotEmpty("ows:Abstract", cv.getDescription());
handleKeywords(cv.getKeywords());
handleMetadataLinks(cv.getMetadataLinks(), "simple");
handleEnvelope(cv.getLatLonBoundingBox());
element("wcs:Identifier", cv.getName());
end("wcs:CoverageSummary");
}
private void handleMetadataLinks(List<MetadataLinkInfo> links, String linkType) {
for (MetadataLinkInfo mdl : links) {
if (mdl != null) {
AttributesImpl attributes = new AttributesImpl();
if ((mdl.getAbout() != null) && (mdl.getAbout() != "")) {
attributes.addAttribute("", "about", "about", "", mdl.getAbout());
}
if ((mdl.getMetadataType() != null) && (mdl.getMetadataType() != "")) {
attributes.addAttribute("", "xlink:type", "xlink:type", "", linkType);
}
if (attributes.getLength() > 0) {
element("ows:Metadata", null, attributes);
}
}
}
}
/**
* Writes the element if and only if the content is not null and not
* empty
*
* @param elementName
* @param content
*/
private void elementIfNotEmpty(String elementName, String content) {
if (content != null && !"".equals(content.trim()))
element(elementName, content);
}
}
}