Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/features/XMLFileFeatures.java @ 3481:e59588ea27bd
Some optimization of the code mentioned by Sascha T.
flys-client/trunk@5176 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Bjoern Ricks <bjoern.ricks@intevation.de> |
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date | Wed, 08 Aug 2012 13:39:35 +0000 |
parents | 4a6321dd5186 |
children | c64cad8dc772 |
rev | line source |
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Implement a class representation of features corresponding to roles
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1 package de.intevation.flys.client.server.features; |
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2 |
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3 import java.io.FileInputStream; |
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4 import java.io.IOException; |
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5 |
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6 import java.util.Hashtable; |
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7 import java.util.List; |
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8 import java.util.LinkedList; |
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9 |
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10 import javax.xml.xpath.XPathConstants; |
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11 |
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12 import org.apache.log4j.Logger; |
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13 |
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14 import org.w3c.dom.Document; |
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15 import org.w3c.dom.Element; |
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16 import org.w3c.dom.Node; |
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17 import org.w3c.dom.NodeList; |
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18 |
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19 import de.intevation.artifacts.common.utils.XMLUtils; |
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20 |
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21 public class XMLFileFeatures implements Features { |
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22 |
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23 private static final Logger logger = Logger.getLogger(XMLFileFeatures.class); |
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24 |
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25 private Hashtable<String, List<String>> featuremap = new Hashtable<String, List<String>>(); |
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26 |
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27 private final static String XPATH_FEATURES = "ftr:feature/child::text()"; |
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28 private final static String XPATH_ROLES = "/ftr:features/ftr:role"; |
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29 |
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30 public XMLFileFeatures(String filename) throws IOException { |
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31 FileInputStream finput = new FileInputStream(filename); |
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32 |
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33 try { |
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34 Document doc = XMLUtils.parseDocument(finput); |
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35 |
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36 NodeList roles = (NodeList) XMLUtils.xpath( |
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37 doc, |
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38 XPATH_ROLES, |
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39 XPathConstants.NODESET, |
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40 FeaturesNamespaceContext.INSTANCE); |
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41 |
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42 for(int i=0, m = roles.getLength(); i < m; i++) { |
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43 Element rolenode = (Element)roles.item(i); |
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44 |
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45 String name = rolenode.getAttributeNS( |
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46 FeaturesNamespaceContext.NAMESPACE_URI, "name"); |
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47 |
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48 logger.debug("Found role: " + name); |
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49 |
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50 NodeList features = (NodeList) XMLUtils.xpath( |
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51 rolenode, |
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52 XPATH_FEATURES, |
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53 XPathConstants.NODESET, |
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54 FeaturesNamespaceContext.INSTANCE); |
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55 |
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56 if (features.getLength() > 0) { |
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57 List<String> allowed = new ArrayList<String>(features.getLength()); |
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58 for (int j=0, l = features.getLength(); j < l; j++) { |
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59 Node featurenode = features.item(j); |
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60 String featurename = featurenode.getNodeValue(); |
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61 |
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62 logger.debug("Found feature: " + featurename); |
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63 |
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64 allowed.add(featurename); |
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65 } |
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66 featuremap.put(name, allowed); |
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67 } |
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68 } |
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69 logger.debug("Loaded all features"); |
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70 } |
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71 finally { |
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72 finput.close(); |
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73 } |
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74 } |
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75 |
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76 @Override |
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77 public List<String> getFeatures(List<String> roles) { |
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78 List<String> features = new LinkedList<String>(); |
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79 |
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80 for (String role: roles) { |
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81 List<String> allowed = this.featuremap.get(role); |
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82 if (!allowed.isEmpty()) { |
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83 features.addAll(allowed); |
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84 } |
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85 } |
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86 return features; |
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87 } |
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88 } |