/* 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.wfs.xml.v1_0_0;
import static org.geoserver.ows.util.ResponseUtils.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.transform.TransformerException;
import net.opengis.wfs.DescribeFeatureTypeType;
import org.geoserver.catalog.Catalog;
import org.geoserver.catalog.FeatureTypeInfo;
import org.geoserver.config.GeoServer;
import org.geoserver.ows.URLMangler.URLType;
import org.geoserver.ows.util.ResponseUtils;
import org.geoserver.platform.Operation;
import org.geoserver.platform.ServiceException;
import org.geoserver.wfs.WFSDescribeFeatureTypeOutputFormat;
import org.geoserver.wfs.WFSException;
import org.geoserver.wfs.WFSInfo;
import org.geotools.gml.producer.FeatureTypeTransformer;
import org.opengis.feature.type.FeatureType;
public class XmlSchemaEncoder extends WFSDescribeFeatureTypeOutputFormat {
/** Standard logging instance for class */
private static final Logger LOGGER = org.geotools.util.logging.Logging.getLogger("org.vfny.geoserver.responses");
// Initialize some generic GML information
// ABSTRACT OUTSIDE CLASS, IF POSSIBLE
private static final String SCHEMA_URI = "\"http://www.w3.org/2001/XMLSchema\"";
private static final String XS_NAMESPACE = "\n xmlns:xs=" + SCHEMA_URI;
private static final String GML_URL = "\"http://www.opengis.net/gml\"";
private static final String GML_NAMESPACE = "\n xmlns:gml=" + GML_URL;
private static final String ELEMENT_FORM_DEFAULT = "\n elementFormDefault=\"qualified\"";
private static final String ATTR_FORM_DEFAULT = "\n attributeFormDefault=\"unqualified\" version=\"1.0\">";
private static final String TARGETNS_PREFIX = "\n targetNamespace=\"";
private static final String TARGETNS_SUFFIX = "\" ";
/** Fixed return footer information */
private static final String FOOTER = "\n</xs:schema>";
WFSInfo wfs;
Catalog catalog;
public XmlSchemaEncoder(GeoServer gs) {
super("XMLSCHEMA");
this.wfs = gs.getService( WFSInfo.class );
this.catalog = gs.getCatalog();
}
public String getMimeType(Object value, Operation operation)
throws ServiceException {
return "text/xml";
}
protected void write(FeatureTypeInfo[] featureTypeInfos, OutputStream output,
Operation describeFeatureType) throws IOException {
//generates response, using general function
String xmlResponse = generateTypes(featureTypeInfos, (DescribeFeatureTypeType) describeFeatureType.getParameters()[0]);
if (!wfs.getGeoServer().getGlobal().isVerbose()) {
//strip out the formatting. This is pretty much the only way we
//can do this, as the user files are going to have newline
//characters and whatnot, unless we can get rid of formatting
//when we read the file, which could be worth looking into if
//this slows things down.
xmlResponse = xmlResponse.replaceAll(">\n[ \\t\\n]*", ">");
xmlResponse = xmlResponse.replaceAll("\n[ \\t\\n]*", " ");
}
Writer writer = new OutputStreamWriter(output, wfs.getGeoServer().getGlobal().getCharset());
writer.write(xmlResponse);
writer.flush();
}
/**
* Internal method to generate the XML response object, using feature
* types.
*
* @param wfsRequest The request object.
*
* @return The XMLSchema describing the features requested.
*
* @throws WFSException For any problems.
*/
private final String generateTypes(FeatureTypeInfo[] infos, DescribeFeatureTypeType request)
throws IOException {
// Initialize return information and intermediate return objects
StringBuffer tempResponse = new StringBuffer();
tempResponse.append("<?xml version=\"1.0\" encoding=\"" + wfs.getGeoServer().getGlobal().getCharset()
+ "\"?>" + "\n<xs:schema ");
//allSameType will throw WFSException if there are types that are not found.
if (allSameType(infos)) {
//all the requested have the same namespace prefix, so return their
//schemas.
FeatureTypeInfo ftInfo = infos[0];
String targetNs = ftInfo.getNamespace().getURI();
//String targetNs = nsInfoType.getXmlns();
tempResponse.append(TARGETNS_PREFIX + targetNs + TARGETNS_SUFFIX);
//namespace
tempResponse.append("\n " + "xmlns:" + ftInfo.getNamespace().getPrefix() + "=\""
+ targetNs + "\"");
//xmlns:" + nsPrefix + "=\"" + targetNs
//+ "\"");
tempResponse.append(GML_NAMESPACE);
tempResponse.append(XS_NAMESPACE);
tempResponse.append(ELEMENT_FORM_DEFAULT + ATTR_FORM_DEFAULT);
//request.getBaseUrl should actually be GeoServer.getSchemaBaseUrl()
//but that method is broken right now. See the note there.
//JD: need a good way to publish resources under a web url, at the
// same time abstracting away the httpness of the service, for
// now replacing the schemas.opengis.net
// tempResponse.append("\n\n<xs:import namespace=" + GML_URL
// + " schemaLocation=\"" + request.getSchemaBaseUrl()
// + "gml/2.1.2/feature.xsd\"/>\n\n");
tempResponse.append("\n\n<xs:import namespace=" + GML_URL + " schemaLocation=\"" +
buildSchemaURL(request.getBaseUrl(), "gml/2.1.2.1/feature.xsd")
+ "\"/>\n\n");
tempResponse.append(generateSpecifiedTypes(infos));
} else {
//the featureTypes do not have all the same prefixes.
tempResponse.append(XS_NAMESPACE);
tempResponse.append(ELEMENT_FORM_DEFAULT + ATTR_FORM_DEFAULT);
Set prefixes = new HashSet();
//iterate through the types, and make a set of their prefixes.
for (int i = 0; i < infos.length; i++) {
FeatureTypeInfo ftInfo = infos[i];
prefixes.add(ftInfo.getNamespace().getPrefix());
}
Iterator prefixIter = prefixes.iterator();
while (prefixIter.hasNext()) {
// iterate through prefixes, and add the types that have that prefix.
String prefix = prefixIter.next().toString();
tempResponse.append(getNSImport(prefix, infos, request.getBaseUrl(), request.getService().toLowerCase()));
}
}
tempResponse.append(FOOTER);
return tempResponse.toString();
}
/**
* Creates a import namespace element, for cases when requests contain
* multiple namespaces, as you can not have more than one target
* namespace. See wfs spec. 8.3.1. All the typeNames that have the
* correct prefix are added to the import statement.
*
* @param prefix the namespace prefix, which must be mapped in the main
* ConfigInfo, for this import statement.
* @param typeNames a list of all requested typeNames, only those that
* match the prefix will be a part of this import statement.
* @param r DOCUMENT ME!
*
* @return The namespace element.
*/
private StringBuffer getNSImport(String prefix, FeatureTypeInfo[] infos, String baseUrl, String service) {
LOGGER.finer("prefix is " + prefix);
StringBuffer retBuffer = new StringBuffer("\n <xs:import namespace=\"");
String namespace = catalog.getNamespaceByPrefix(prefix).getURI();
retBuffer.append(namespace + "\"");
Map<String, String> params = new HashMap<String, String>();
params.put("request", "DescribeFeatureType");
params.put("service", "wfs");
params.put("version", "1.0.0");
StringBuilder typeNames = new StringBuilder();
for (int i = 0; i < infos.length; i++) {
FeatureTypeInfo info = infos[i];
String typeName = info.getPrefixedName();
if (typeName.startsWith(prefix + ":")) {
typeNames.append(typeName).append(",");
}
//JD: some of this logic should be fixed by poplulating the
// info objects properly, double check
// if (typeName.startsWith(prefix)
// || ((typeName.indexOf(':') == -1)
// && prefix.equals(r.getWFS().getData().getDefaultNameSpace()
// .getPrefix()))) {
// retBuffer.append(typeName + ",");
// }
}
typeNames.deleteCharAt(retBuffer.length() - 1);
params.put("typeName", typeNames.toString());
String ftLocation = buildURL(baseUrl, service, params, URLType.SERVICE);
retBuffer.append("\n schemaLocation=\"" + ResponseUtils.encodeXML(ftLocation));
retBuffer.append("\"/>");
return retBuffer;
}
/**
* Internal method to print just the requested types. They should all be
* in the same namespace, that handling should be done before. This will
* not do any namespace handling, just prints up either what's in the
* schema file, or if it's not there then generates the types from their
* FeatureTypes. Also appends the global element so that the types can
* substitute as features.
*
* @param requestedTypes The requested table names.
* @param gs DOCUMENT ME!
*
* @return A string of the types printed.
*
* @throws WFSException DOCUMENT ME!
*
* @task REVISIT: We need a way to make sure the extension bases are
* correct. should likely add a field to the info.xml in the
* featureTypes folder, that optionally references an extension base
* (should it be same namespace? we could also probably just do an
* import on the extension base). This function then would see if
* the typeInfo has an extension base, and would add or import the
* file appropriately, and put the correct substitution group in
* this function.
*/
private String generateSpecifiedTypes(FeatureTypeInfo[] infos) {
//TypeRepository repository = TypeRepository.getInstance();
String tempResponse = new String();
String generatedType = new String();
Set validTypes = new HashSet();
// Loop through requested tables to add element types
for (int i = 0; i < infos.length; i++) {
FeatureTypeInfo ftInfo = (FeatureTypeInfo) infos[i];
if (!validTypes.contains(ftInfo)) {
//TODO: ressurect this
File schemaFile = null; /*ftInfo.getSchemaFile();*/
try {
//Hack here, schemaFile should not be null, but it is
//when a fType is first created, since we only add the
//schemaFile param to dto on a load. This should be
//fixed, maybe even have the schema file persist, or at
//the very least be present right after creation.
if ((schemaFile != null) && schemaFile.exists() && schemaFile.canRead()) {
generatedType = writeFile(schemaFile);
} else {
FeatureType ft = ftInfo.getFeatureType();
String gType = generateFromSchema(ft);
if ((gType != null) && (gType != "")) {
generatedType = gType;
}
}
} catch (IOException e) {
generatedType = "";
}
if (!generatedType.equals("")) {
tempResponse = tempResponse + generatedType;
validTypes.add(ftInfo);
}
}
}
// Loop through requested tables again to add elements
// NOT VERY EFFICIENT - PERHAPS THE MYSQL ABSTRACTION CAN FIX THIS;
// STORE IN HASH?
for (Iterator i = validTypes.iterator(); i.hasNext();) {
// Print element representation of table
tempResponse = tempResponse + printElement((FeatureTypeInfo) i.next());
}
tempResponse = tempResponse + "\n\n";
return tempResponse;
}
/**
* Transforms a FeatureTypeInfo into gml, with no headers.
*
* @param schema the schema to transform.
*
* @return DOCUMENT ME!
*
* @task REVISIT: when this class changes to writing directly to out this
* can just take a writer and write directly to it.
*/
private String generateFromSchema(FeatureType schema)
throws IOException {
try {
StringWriter writer = new StringWriter();
FeatureTypeTransformer t = new FeatureTypeTransformer();
t.setIndentation(4);
t.setOmitXMLDeclaration(true);
t.transform(schema, writer);
return writer.getBuffer().toString();
} catch (TransformerException te) {
LOGGER.log( Level.WARNING, "Error generating schema from feature type", te );
throw (IOException) new IOException("problem transforming type").initCause(te);
}
}
/**
* Internal method to print XML element information for table.
*
* @param type The table name.
*
* @return The element part of the response.
*/
private static String printElement(FeatureTypeInfo type) {
return "\n <xs:element name=\"" + type.getName() + "\" type=\""
+ type.getNamespace().getPrefix() + ":" + type.getName() + "_Type"
+ "\" substitutionGroup=\"gml:_Feature\"/>";
}
/**
* Adds a feature type object to the final output buffer
*
* @param inputFileName The name of the feature type.
*
* @return The string representation of the file containing the schema.
*
* @throws WFSException For io problems reading the file.
*/
public String writeFile(File inputFile) throws IOException {
LOGGER.finest("writing file " + inputFile);
String finalOutput = new String();
try {
// File inputFile = new File(inputFileName);
FileInputStream inputStream = new FileInputStream(inputFile);
byte[] fileBuffer = new byte[inputStream.available()];
int bytesRead;
while ((bytesRead = inputStream.read(fileBuffer)) != -1) {
String tempOutput = new String(fileBuffer);
finalOutput = finalOutput + tempOutput;
}
} catch (IOException e) {
//REVISIT: should things fail if there are featureTypes that
//don't have schemas in the right place? Because as it is now
//a describe all will choke if there is one ft with no schema.xml
throw (IOException) new IOException("problem writing featureType information "
+ " from " + inputFile).initCause(e);
}
return finalOutput;
}
/**
* Checks that the collection of featureTypeNames all have the same prefix.
* Used to determine if their schemas are all in the same namespace or if
* imports need to be done.
*
* @param infos list of feature type info objects..
*
* @return true if all the types in the collection have the same prefix.
*
*/
public boolean allSameType(FeatureTypeInfo[] infos) {
boolean sameType = true;
if (infos.length == 0) {
return false;
}
FeatureTypeInfo first = infos[0];
for (int i = 0; i < infos.length; i++) {
FeatureTypeInfo ftInfo = infos[i];
if (!first.getNamespace().equals(ftInfo.getNamespace())) {
return false;
}
}
return sameType;
}
}