Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/features/XMLFileFeatures.java @ 3481:e59588ea27bd

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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>
date Wed, 08 Aug 2012 13:39:35 +0000
parents 4a6321dd5186
children c64cad8dc772
rev   line source
3476
4a6321dd5186 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 }
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