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 / DefaultIterator.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.DataException; |
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7 | import org.gvsig.tools.dispose.DisposableIterator; |
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8 | import org.gvsig.fmap.dal.feature.Feature; |
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9 | import org.gvsig.fmap.dal.feature.impl.DefaultFeature; |
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10 | import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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11 | import org.gvsig.tools.dispose.impl.AbstractDisposable; |
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12 | import org.gvsig.tools.exception.BaseException; |
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13 | |||
14 | |||
15 | class DefaultIterator extends AbstractDisposable implements DisposableIterator { |
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16 | |||
17 | protected Iterator iterator; |
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18 | protected DefaultFeatureSet fset;
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19 | protected Feature lastFeature = null; |
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20 | |||
21 | public DefaultIterator(DefaultFeatureSet featureSet) {
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22 | this.fset = featureSet;
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23 | } |
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24 | |||
25 | public DefaultIterator(DefaultFeatureSet featureSet, long index) |
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26 | throws DataException {
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27 | this.fset = featureSet;
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28 | if (index > 0) { |
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29 | if (featureSet.provider.canIterateFromIndex()) {
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30 | try {
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31 | this.iterator = featureSet.provider.iterator(index);
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32 | } catch (UnsupportedOperationException e) { |
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33 | this.iterator = featureSet.provider.iterator();
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34 | skypto(index); |
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35 | } |
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36 | } else {
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37 | this.iterator = featureSet.provider.iterator();
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38 | skypto(index); |
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39 | } |
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40 | } else {
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41 | this.iterator = featureSet.provider.iterator();
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42 | } |
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43 | } |
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44 | |||
45 | protected void skypto(long index) { |
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46 | // TODO: Comprobar si esta bien la condicion de n<=
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47 | for (long n = 0; n <= index && this.getIterator().hasNext(); n++, this |
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48 | .getIterator() |
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49 | .next()) { |
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50 | ; |
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51 | } |
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52 | } |
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53 | |||
54 | public boolean hasNext() { |
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55 | fset.checkSourceStoreModified(); |
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56 | return this.getIterator().hasNext(); |
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57 | } |
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58 | |||
59 | public Object next() { |
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60 | fset.checkSourceStoreModified(); |
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61 | lastFeature = null;
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62 | if (!this.hasNext()) { |
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63 | throw new NoSuchElementException(); |
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64 | } |
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65 | try {
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66 | lastFeature = this.createFeature((FeatureProvider) this.getIterator() |
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67 | .next()); |
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68 | return lastFeature;
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69 | } catch (DataException e) {
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70 | RuntimeException ex = new RuntimeException(); |
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71 | e.initCause(e); |
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72 | throw ex;
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73 | } |
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74 | } |
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75 | |||
76 | public void remove() { |
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77 | if (!fset.store.isEditing()) {
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78 | throw new UnsupportedOperationException(); |
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79 | } |
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80 | if (lastFeature == null) { |
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81 | throw new IllegalStateException(); |
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82 | } |
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83 | try {
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84 | this.fset.delete(this.lastFeature); |
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85 | } catch (DataException e) {
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86 | // FIXME Cambiar excepcion a una Runtime de DAL
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87 | throw new RuntimeException(e); |
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88 | } |
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89 | lastFeature = null;
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90 | } |
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91 | |||
92 | protected DefaultFeature createFeature(FeatureProvider fData)
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93 | throws DataException {
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94 | fData.setNew(false);
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95 | if (this.fset.transform.isEmpty()) { |
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96 | return new DefaultFeature(fset.store, fData); |
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97 | } else {
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98 | return (DefaultFeature) this.fset.transform.applyTransform( |
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99 | new DefaultFeature(fset.store, fData), fset
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100 | .getDefaultFeatureType()); |
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101 | } |
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102 | } |
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103 | |||
104 | protected Iterator getIterator() { |
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105 | return this.iterator; |
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106 | } |
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107 | |||
108 | protected boolean isDeletedOrHasToSkip(FeatureProvider data) { |
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109 | return false; |
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110 | } |
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111 | |||
112 | protected void doNext() throws DataException { |
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113 | |||
114 | } |
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115 | |||
116 | protected void doDispose() throws BaseException { |
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117 | if (iterator instanceof DisposableIterator){ |
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118 | ((DisposableIterator)this.iterator).dispose();
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119 | } |
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120 | this.iterator = null; |
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121 | this.fset = null; |
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122 | this.lastFeature = null; |
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123 | } |
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124 | |||
125 | } |