bjoern@3476: package de.intevation.flys.client.server.features;
bjoern@3476: 
bjoern@3476: import java.io.FileInputStream;
bjoern@3476: import java.io.IOException;
bjoern@3476: 
bjoern@3482: import java.util.ArrayList;
bjoern@3476: import java.util.Hashtable;
bjoern@3476: import java.util.List;
bjoern@3476: import java.util.LinkedList;
bjoern@3476: 
bjoern@3476: import javax.xml.xpath.XPathConstants;
bjoern@3476: 
bjoern@3476: import org.apache.log4j.Logger;
bjoern@3476: 
bjoern@3476: import org.w3c.dom.Document;
bjoern@3476: import org.w3c.dom.Element;
bjoern@3476: import org.w3c.dom.Node;
bjoern@3476: import org.w3c.dom.NodeList;
bjoern@3476: 
bjoern@3476: import de.intevation.artifacts.common.utils.XMLUtils;
bjoern@3476: 
bjoern@3476: public class XMLFileFeatures implements Features {
bjoern@3476: 
bjoern@3476:     private static final Logger logger = Logger.getLogger(XMLFileFeatures.class);
bjoern@3476: 
bjoern@3476:     private Hashtable<String, List<String>> featuremap = new Hashtable<String, List<String>>();
bjoern@3476: 
bjoern@3481:     private final static String XPATH_FEATURES = "ftr:feature/child::text()";
bjoern@3481:     private final static String XPATH_ROLES    = "/ftr:features/ftr:role";
bjoern@3481: 
bjoern@3476:     public XMLFileFeatures(String filename) throws IOException {
bjoern@3476:         FileInputStream finput = new FileInputStream(filename);
bjoern@3476: 
bjoern@3481:         try {
bjoern@3481:             Document doc = XMLUtils.parseDocument(finput);
bjoern@3476: 
bjoern@3481:             NodeList roles = (NodeList) XMLUtils.xpath(
bjoern@3481:                 doc,
bjoern@3481:                 XPATH_ROLES,
bjoern@3476:                 XPathConstants.NODESET,
bjoern@3476:                 FeaturesNamespaceContext.INSTANCE);
bjoern@3476: 
bjoern@3481:             for(int i=0, m = roles.getLength(); i < m; i++) {
bjoern@3481:                 Element rolenode = (Element)roles.item(i);
bjoern@3476: 
bjoern@3481:                 String name = rolenode.getAttributeNS(
bjoern@3481:                         FeaturesNamespaceContext.NAMESPACE_URI, "name");
bjoern@3481: 
bjoern@3481:                 logger.debug("Found role: " + name);
bjoern@3481: 
bjoern@3481:                 NodeList features = (NodeList) XMLUtils.xpath(
bjoern@3481:                     rolenode,
bjoern@3481:                     XPATH_FEATURES,
bjoern@3481:                     XPathConstants.NODESET,
bjoern@3481:                     FeaturesNamespaceContext.INSTANCE);
bjoern@3481: 
bjoern@3481:                 if (features.getLength() > 0) {
bjoern@3481:                     List<String> allowed = new ArrayList<String>(features.getLength());
bjoern@3481:                     for (int j=0, l = features.getLength(); j < l; j++) {
bjoern@3481:                         Node featurenode = features.item(j);
bjoern@3481:                         String featurename = featurenode.getNodeValue();
bjoern@3481: 
bjoern@3481:                         logger.debug("Found feature: " + featurename);
bjoern@3481: 
bjoern@3481:                         allowed.add(featurename);
bjoern@3481:                     }
bjoern@3481:                     featuremap.put(name, allowed);
bjoern@3476:                 }
bjoern@3476:             }
bjoern@3481:             logger.debug("Loaded all features");
bjoern@3476:         }
bjoern@3481:         finally {
bjoern@3481:             finput.close();
bjoern@3481:         }
bjoern@3476:     }
bjoern@3476: 
bjoern@3476:     @Override
bjoern@3476:     public List<String> getFeatures(List<String> roles) {
bjoern@3476:         List<String> features = new LinkedList<String>();
bjoern@3476: 
bjoern@3476:         for (String role: roles) {
bjoern@3476:             List<String> allowed = this.featuremap.get(role);
bjoern@3476:             if (!allowed.isEmpty()) {
bjoern@3476:                 features.addAll(allowed);
bjoern@3476:             }
bjoern@3476:         }
bjoern@3476:         return features;
bjoern@3476:     }
bjoern@3476: }