svn-gvsig-desktop / branches / v2_0_0_prep / libraries / libFMap_data / src / org / gvsig / fmap / data / feature / impl / DefaultFeatureComparator.java @ 24017
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| 1 | 23820 | jjdelcerro | package org.gvsig.fmap.data.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.data.feature.Feature; |
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| 7 | import org.gvsig.fmap.data.feature.FeatureQueryOrder; |
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| 8 | import org.gvsig.tools.evaluator.Evaluator; |
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| 9 | import org.gvsig.tools.evaluator.EvaluatorData; |
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| 10 | |||
| 11 | public class DefaultFeatureComparator implements Comparator { |
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| 12 | |||
| 13 | private FeatureQueryOrder order;
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| 14 | |||
| 15 | |||
| 16 | public DefaultFeatureComparator(FeatureQueryOrder order) {
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| 17 | this.order = order;
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| 18 | // TODO optimizar en un array???
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| 19 | |||
| 20 | } |
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| 21 | |||
| 22 | |||
| 23 | private int myCompare(Object arg0, Object arg1) { |
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| 24 | if (arg0 == null){ |
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| 25 | if (arg1 == null){ |
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| 26 | return 0; |
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| 27 | } else{
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| 28 | return 1; |
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| 29 | } |
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| 30 | } else if (arg1 == null){ |
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| 31 | if (arg0 == null) { |
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| 32 | return 0; |
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| 33 | } else {
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| 34 | return 1; |
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| 35 | } |
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| 36 | } |
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| 37 | if (arg0 instanceof Comparable) { |
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| 38 | return ((Comparable) arg0).compareTo(arg1); |
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| 39 | } else if (arg1 instanceof Comparable) { |
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| 40 | return ((Comparable) arg1).compareTo(arg0) * -1; |
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| 41 | } |
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| 42 | |||
| 43 | if (arg0.equals(arg1)){
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| 44 | return 0; |
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| 45 | } else{
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| 46 | return -1; |
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| 47 | } |
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| 48 | |||
| 49 | } |
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| 50 | |||
| 51 | public int compare(Object arg0, Object arg1) { |
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| 52 | Iterator iter = this.order.iterator(); |
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| 53 | int returnValue = 0; |
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| 54 | Feature f0 = (Feature) arg0; |
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| 55 | Feature f1 = (Feature) arg1; |
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| 56 | Object item;
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| 57 | String attrName;
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| 58 | Evaluator evaluator; |
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| 59 | while (returnValue == 0 && iter.hasNext()) { |
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| 60 | item = iter.next(); |
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| 61 | if (item instanceof String) { |
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| 62 | attrName = (String) item;
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| 63 | returnValue = this
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| 64 | .myCompare(f0.get(attrName), f1 |
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| 65 | .get(attrName)); |
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| 66 | } else {
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| 67 | evaluator = (Evaluator) item; |
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| 68 | returnValue = this.myCompare(evaluator
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| 69 | .evaluate((EvaluatorData) f0), evaluator |
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| 70 | .evaluate((EvaluatorData) f1)); |
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| 71 | } |
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| 72 | } |
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| 73 | |||
| 74 | return returnValue;
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| 75 | } |
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| 76 | |||
| 77 | } |