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 @ 43983
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1 | 40559 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | *
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4 | * Copyright (C) 2007-2013 gvSIG Association.
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5 | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | * as published by the Free Software Foundation; either version 3
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9 | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | *
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21 | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | */
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24 | 40435 | jjdelcerro | package org.gvsig.fmap.dal.feature.impl.featureset; |
25 | |||
26 | import java.util.Iterator; |
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27 | import java.util.NoSuchElementException; |
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28 | |||
29 | import org.gvsig.fmap.dal.exception.DataException; |
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30 | import org.gvsig.tools.dispose.DisposableIterator; |
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31 | import org.gvsig.fmap.dal.feature.Feature; |
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32 | import org.gvsig.fmap.dal.feature.impl.DefaultFeature; |
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33 | import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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34 | import org.gvsig.tools.dispose.impl.AbstractDisposable; |
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35 | import org.gvsig.tools.exception.BaseException; |
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36 | |||
37 | |||
38 | class DefaultIterator extends AbstractDisposable implements DisposableIterator { |
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39 | |||
40 | protected Iterator iterator; |
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41 | protected DefaultFeatureSet fset;
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42 | protected Feature lastFeature = null; |
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43 | |||
44 | public DefaultIterator(DefaultFeatureSet featureSet) {
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45 | this.fset = featureSet;
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46 | } |
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47 | |||
48 | 43358 | jjdelcerro | public DefaultIterator(DefaultFeatureSet featureSet, long index, long elements) |
49 | 40435 | jjdelcerro | throws DataException {
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50 | this.fset = featureSet;
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51 | if (index > 0) { |
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52 | if (featureSet.provider.canIterateFromIndex()) {
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53 | try {
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54 | 43358 | jjdelcerro | this.iterator = featureSet.provider.iterator(index, elements);
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55 | 40435 | jjdelcerro | } catch (UnsupportedOperationException e) { |
56 | this.iterator = featureSet.provider.iterator();
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57 | skypto(index); |
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58 | } |
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59 | } else {
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60 | this.iterator = featureSet.provider.iterator();
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61 | skypto(index); |
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62 | } |
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63 | } else {
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64 | this.iterator = featureSet.provider.iterator();
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65 | } |
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66 | } |
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67 | |||
68 | protected void skypto(long index) { |
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69 | // TODO: Comprobar si esta bien la condicion de n<=
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70 | for (long n = 0; n <= index && this.getIterator().hasNext(); n++, this |
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71 | .getIterator() |
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72 | .next()) { |
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73 | ; |
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74 | } |
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75 | } |
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76 | |||
77 | 42488 | jjdelcerro | @Override
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78 | public boolean hasNext() { |
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79 | if (this.fset == null) { |
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80 | return false; |
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81 | } |
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82 | fset.checkSourceStoreModified(); |
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83 | if (this.getIterator().hasNext()) { |
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84 | return true; |
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85 | } |
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86 | try {
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87 | this.doDispose();
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88 | } catch (BaseException ex) {
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89 | throw new RuntimeException("Can't dispose iterator.",ex); |
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90 | } |
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91 | return false; |
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92 | } |
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93 | 40435 | jjdelcerro | |
94 | 42488 | jjdelcerro | @Override
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95 | 40435 | jjdelcerro | public Object next() { |
96 | 42488 | jjdelcerro | if( fset == null ) { |
97 | throw new NoSuchElementException(); |
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98 | } |
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99 | 40435 | jjdelcerro | fset.checkSourceStoreModified(); |
100 | lastFeature = null;
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101 | if (!this.hasNext()) { |
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102 | throw new NoSuchElementException(); |
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103 | } |
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104 | try {
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105 | lastFeature = this.createFeature((FeatureProvider) this.getIterator() |
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106 | .next()); |
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107 | return lastFeature;
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108 | } catch (DataException e) {
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109 | 41294 | jjdelcerro | throw new RuntimeException(e); |
110 | 40435 | jjdelcerro | } |
111 | } |
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112 | |||
113 | public void remove() { |
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114 | if (!fset.store.isEditing()) {
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115 | throw new UnsupportedOperationException(); |
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116 | } |
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117 | if (lastFeature == null) { |
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118 | throw new IllegalStateException(); |
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119 | } |
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120 | try {
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121 | this.fset.delete(this.lastFeature); |
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122 | } catch (DataException e) {
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123 | // FIXME Cambiar excepcion a una Runtime de DAL
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124 | throw new RuntimeException(e); |
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125 | } |
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126 | lastFeature = null;
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127 | } |
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128 | |||
129 | protected DefaultFeature createFeature(FeatureProvider fData)
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130 | throws DataException {
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131 | fData.setNew(false);
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132 | if (this.fset.transform.isEmpty()) { |
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133 | return new DefaultFeature(fset.store, fData); |
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134 | } else {
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135 | return (DefaultFeature) this.fset.transform.applyTransform( |
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136 | new DefaultFeature(fset.store, fData), fset
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137 | .getDefaultFeatureType()); |
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138 | } |
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139 | } |
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140 | |||
141 | protected Iterator getIterator() { |
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142 | return this.iterator; |
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143 | } |
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144 | |||
145 | protected boolean isDeletedOrHasToSkip(FeatureProvider data) { |
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146 | return false; |
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147 | } |
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148 | |||
149 | protected void doNext() throws DataException { |
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150 | |||
151 | } |
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152 | |||
153 | protected void doDispose() throws BaseException { |
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154 | if (iterator instanceof DisposableIterator){ |
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155 | ((DisposableIterator)this.iterator).dispose();
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156 | } |
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157 | this.iterator = null; |
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158 | this.fset = null; |
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159 | this.lastFeature = null; |
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160 | } |
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161 | |||
162 | } |