Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/StackFrames.java @ 976:d830c398c8f4

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Improved XPath handling for absent flags. flys-artifacts/trunk@2402 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 25 Jul 2011 14:12:14 +0000
parents e91996b46e3c
children
rev   line source
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1 package de.intevation.flys.artifacts.services.meta;
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2
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3 import java.util.Map;
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4 import java.util.List;
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5 import java.util.HashMap;
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6 import java.util.ArrayList;
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7
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8 import javax.xml.xpath.XPathVariableResolver;
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9
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10 import javax.xml.namespace.QName;
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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 public class StackFrames
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15 implements XPathVariableResolver
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16 {
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17 private static Logger log = Logger.getLogger(StackFrames.class);
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18
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19 protected List<Map<String, Object>> frames;
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20
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21 public StackFrames() {
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22 frames = new ArrayList<Map<String, Object>>();
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23 }
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24
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25 public StackFrames(Map<String, Object> initialFrame) {
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26 this();
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27 if (initialFrame != null) {
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28 frames.add(new HashMap<String, Object>(initialFrame));
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29 }
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30 }
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31
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32 public void enter() {
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33 frames.add(new HashMap<String, Object>());
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34 }
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35
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36 public void leave() {
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37 frames.remove(frames.size()-1);
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38 }
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39
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40 public void put(String key, Object value) {
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41 int N = frames.size();
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42 if (N > 0) {
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43 frames.get(N-1).put(key, value);
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44 }
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45 }
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46
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47 public void put(String [] keys, Object [] values) {
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48 Map<String, Object> top = frames.get(frames.size()-1);
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49 for (int i = 0; i < keys.length; ++i) {
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50 top.put(keys[i], values[i]);
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51 }
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52 }
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53
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54 public boolean containsKey(String key) {
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55 for (int i = frames.size()-1; i >= 0; --i) {
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56 if (frames.get(i).containsKey(key)) {
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57 return true;
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58 }
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59 }
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60 return false;
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61 }
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62
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63 public Object get(String key) {
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64 return get(key, null);
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65 }
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66
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67 public Object get(String key, Object def) {
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68
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69 for (int i = frames.size()-1; i >= 0; --i) {
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70 Map<String, Object> frame = frames.get(i);
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71 if (frame.containsKey(key)) {
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72 return frame.get(key);
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73 }
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74 }
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75
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76 return def;
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77 }
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79 @Override
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80 public Object resolveVariable(QName variableName) {
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81 if (log.isDebugEnabled()) {
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82 log.debug("resolve var: " + variableName);
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83 }
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84 return get(variableName.getLocalPart());
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85 }
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86 }
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87 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org