svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.impl / src / main / java / org / gvsig / fmap / dal / feature / impl / DefaultFeatureComparator.java @ 40435
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1 | 40435 | jjdelcerro | package org.gvsig.fmap.dal.feature.impl; |
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2 | |||
3 | import java.util.Comparator; |
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4 | import java.util.Iterator; |
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5 | |||
6 | import org.gvsig.fmap.dal.exception.DataEvaluatorRuntimeException; |
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7 | import org.gvsig.fmap.dal.feature.Feature; |
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8 | import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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9 | import org.gvsig.tools.evaluator.Evaluator; |
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10 | import org.gvsig.tools.evaluator.EvaluatorData; |
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11 | import org.gvsig.tools.evaluator.EvaluatorException; |
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12 | |||
13 | public class DefaultFeatureComparator implements Comparator { |
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14 | |||
15 | private FeatureQueryOrder order;
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16 | |||
17 | |||
18 | public DefaultFeatureComparator(FeatureQueryOrder order) {
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19 | this.order = order;
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20 | // TODO optimizar en un array???
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21 | |||
22 | } |
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23 | |||
24 | |||
25 | private int myCompare(Object arg0, Object arg1) { |
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26 | if (arg0 == null){ |
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27 | if (arg1 == null){ |
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28 | return 0; |
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29 | } else{
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30 | return 1; |
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31 | } |
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32 | } else if (arg1 == null){ |
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33 | if (arg0 == null) { |
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34 | return 0; |
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35 | } else {
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36 | return 1; |
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37 | } |
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38 | } |
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39 | if (arg0 instanceof Comparable) { |
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40 | return ((Comparable) arg0).compareTo(arg1); |
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41 | } else if (arg1 instanceof Comparable) { |
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42 | return ((Comparable) arg1).compareTo(arg0) * -1; |
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43 | } |
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44 | |||
45 | if (arg0.equals(arg1)){
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46 | return 0; |
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47 | } else{
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48 | return -1; |
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49 | } |
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50 | |||
51 | } |
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52 | |||
53 | public int compare(Object arg0, Object arg1) { |
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54 | Iterator iter = this.order.iterator(); |
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55 | int returnValue = 0; |
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56 | Feature f0 = (Feature) arg0; |
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57 | Feature f1 = (Feature) arg1; |
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58 | Object item;
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59 | String attrName;
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60 | Evaluator evaluator; |
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61 | while (returnValue == 0 && iter.hasNext()) { |
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62 | item = iter.next(); |
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63 | if (item instanceof String) { |
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64 | attrName = (String) item;
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65 | returnValue = this
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66 | .myCompare(f0.get(attrName), f1 |
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67 | .get(attrName)); |
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68 | } else {
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69 | evaluator = (Evaluator) item; |
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70 | try {
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71 | returnValue = this.myCompare(evaluator
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72 | .evaluate((EvaluatorData) f0), evaluator |
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73 | .evaluate((EvaluatorData) f1)); |
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74 | } catch (EvaluatorException e) {
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75 | throw new DataEvaluatorRuntimeException(e); |
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76 | } |
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77 | } |
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78 | } |
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79 | |||
80 | return returnValue;
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81 | } |
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82 | |||
83 | } |