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 / featureset / FilteredIterator.java @ 40435
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1 | 40435 | jjdelcerro | package org.gvsig.fmap.dal.feature.impl.featureset; |
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2 | |||
3 | import java.util.Iterator; |
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4 | import java.util.NoSuchElementException; |
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5 | |||
6 | import org.gvsig.fmap.dal.exception.DataEvaluatorException; |
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7 | import org.gvsig.fmap.dal.exception.DataException; |
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8 | import org.gvsig.fmap.dal.feature.impl.DefaultFeature; |
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9 | import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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10 | import org.gvsig.tools.evaluator.Evaluator; |
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11 | import org.gvsig.tools.evaluator.EvaluatorException; |
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12 | import org.gvsig.tools.exception.BaseException; |
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13 | |||
14 | public class FilteredIterator extends DefaultIterator { |
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15 | |||
16 | protected boolean nextChecked; |
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17 | protected DefaultFeature current;
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18 | protected Evaluator filter;
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19 | |||
20 | |||
21 | protected FilteredIterator(DefaultFeatureSet featureSet) {
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22 | super(featureSet);
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23 | this.current = null; |
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24 | this.nextChecked = false; |
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25 | this.filter = featureSet.query.getFilter();
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26 | } |
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27 | |||
28 | FilteredIterator(DefaultFeatureSet featureSet, long index)
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29 | throws DataException {
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30 | super(featureSet);
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31 | this.iterator = featureSet.provider.iterator();
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32 | if (index > 0) { |
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33 | this.skypto(index);
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34 | } |
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35 | this.current = null; |
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36 | this.nextChecked = false; |
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37 | this.filter = featureSet.query.getFilter();
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38 | } |
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39 | |||
40 | protected void skypto(long index) { |
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41 | // TODO: Comprobar si esta bien la condicion de n<=
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42 | for (long n = 0; n <= index && this.hasNext(); n++, this.next()) { |
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43 | ; |
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44 | } |
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45 | } |
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46 | |||
47 | protected void doNext() throws DataException { |
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48 | nextChecked = true;
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49 | DefaultFeature feature; |
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50 | FeatureProvider data; |
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51 | Object obj;
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52 | while (this.getIterator().hasNext()) { |
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53 | obj =this.getIterator().next();
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54 | if (obj instanceof FeatureProvider){ |
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55 | data = (FeatureProvider)obj; |
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56 | if (isDeletedOrHasToSkip(data)) {
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57 | continue;
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58 | } |
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59 | feature = this.createFeature(data);
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60 | } else {
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61 | feature = (DefaultFeature)obj; |
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62 | if (isDeletedOrHasToSkip(feature.getData())) {
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63 | continue;
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64 | } |
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65 | } |
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66 | if (this.match(feature)) { |
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67 | this.current = feature;
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68 | return;
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69 | } |
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70 | } |
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71 | this.current = null; |
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72 | } |
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73 | |||
74 | protected Iterator getIterator() { |
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75 | return this.iterator; |
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76 | } |
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77 | |||
78 | public boolean hasNext() { |
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79 | fset.checkSourceStoreModified(); |
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80 | if (nextChecked) {
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81 | return this.current != null; |
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82 | } |
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83 | try {
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84 | doNext(); |
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85 | } catch( DataException e) {
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86 | NullPointerException ex = new NullPointerException(); |
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87 | ex.initCause(e); |
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88 | throw ex;
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89 | } |
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90 | return this.current != null; |
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91 | } |
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92 | |||
93 | public boolean match(DefaultFeature feature) throws DataException { |
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94 | try {
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95 | if (filter==null) { |
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96 | return true; |
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97 | } |
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98 | return ((Boolean) this.filter.evaluate(feature)).booleanValue(); |
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99 | } catch (EvaluatorException e) {
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100 | throw new DataEvaluatorException(e); |
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101 | } |
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102 | } |
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103 | |||
104 | public Object next() { |
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105 | fset.checkSourceStoreModified(); |
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106 | if (!nextChecked) {
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107 | hasNext(); |
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108 | } |
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109 | if (this.current == null) { |
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110 | throw new NoSuchElementException(); |
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111 | } |
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112 | this.lastFeature = null; |
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113 | nextChecked = false;
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114 | DefaultFeature feature = this.current;
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115 | this.current = null; |
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116 | this.lastFeature = feature;
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117 | return feature;
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118 | } |
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119 | |||
120 | protected void doDispose() throws BaseException { |
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121 | super.doDispose();
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122 | current = null;
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123 | filter = null;
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124 | } |
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125 | |||
126 | } |