svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.db / org.gvsig.fmap.dal.db.jdbc / src / main / java / org / gvsig / fmap / dal / store / jdbc2 / impl / JDBCIterator.java @ 44058
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1 | 43020 | 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 modify it under
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7 | * the terms of the GNU General Public License as published by the Free Software
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8 | * Foundation; either version 3 of the License, or (at your option) any later
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9 | * version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful, but WITHOUT
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12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 | * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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14 | * details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License along with
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17 | * this program; if not, write to the Free Software Foundation, Inc., 51
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18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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19 | *
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20 | * For any additional information, do not hesitate to contact us at info AT
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21 | * gvsig.com, or visit our website www.gvsig.com.
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22 | */
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23 | package org.gvsig.fmap.dal.store.jdbc2.impl; |
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24 | |||
25 | import java.sql.SQLException; |
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26 | import java.util.NoSuchElementException; |
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27 | |||
28 | import org.gvsig.fmap.dal.exception.DataException; |
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29 | import org.gvsig.fmap.dal.feature.FeatureType; |
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30 | import org.gvsig.fmap.dal.feature.spi.AbstractFeatureProviderIterator; |
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31 | import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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32 | import org.gvsig.fmap.dal.store.jdbc2.JDBCStoreProvider; |
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33 | import org.gvsig.fmap.dal.store.jdbc2.ResulSetControler.ResultSetEntry; |
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34 | import org.gvsig.tools.exception.BaseException; |
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35 | |||
36 | public class JDBCIterator extends AbstractFeatureProviderIterator { |
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37 | |||
38 | protected ResultSetEntry resulsetEntry;
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39 | protected Boolean hasNext = null; |
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40 | protected FeatureType featureType;
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41 | protected JDBCSetProvider set;
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42 | |||
43 | protected JDBCIterator(
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44 | JDBCStoreProvider store, |
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45 | JDBCSetProvider set, |
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46 | FeatureType featureType, |
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47 | ResultSetEntry resulsetEntry |
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48 | ) throws DataException {
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49 | super(store);
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50 | this.resulsetEntry = resulsetEntry;
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51 | this.featureType = featureType;
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52 | this.set = set;
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53 | this.hasNext = null; |
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54 | } |
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55 | |||
56 | @Override
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57 | protected JDBCStoreProvider getFeatureStoreProvider() {
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58 | return (JDBCStoreProvider) super.getFeatureStoreProvider(); |
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59 | } |
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60 | |||
61 | @Override
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62 | public final Object next() { |
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63 | return internalNext();
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64 | } |
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65 | |||
66 | @Override
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67 | public final boolean hasNext() { |
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68 | return internalHasNext();
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69 | } |
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70 | |||
71 | @Override
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72 | protected boolean internalHasNext() { |
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73 | if (hasNext == null) { |
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74 | try {
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75 | if ( resulsetEntry.next() ) {
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76 | hasNext = Boolean.TRUE;
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77 | } else {
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78 | hasNext = Boolean.FALSE;
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79 | this.close();
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80 | } |
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81 | } catch (SQLException e) { |
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82 | throw new RuntimeException(e); |
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83 | } |
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84 | } |
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85 | return hasNext;
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86 | } |
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87 | |||
88 | @Override
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89 | protected Object internalNext() { |
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90 | if (!hasNext()) {
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91 | throw new NoSuchElementException(); |
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92 | } |
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93 | FeatureProvider data; |
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94 | try {
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95 | data = getFeatureProvider(); |
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96 | } catch (DataException e) {
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97 | throw new RuntimeException(e); |
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98 | } |
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99 | hasNext = null;
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100 | return data;
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101 | } |
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102 | |||
103 | @Override
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104 | public void remove() { |
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105 | throw new UnsupportedOperationException(); |
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106 | } |
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107 | |||
108 | protected FeatureProvider createFeatureProvider() throws DataException { |
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109 | return getFeatureStoreProvider().createFeatureProvider(featureType);
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110 | } |
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111 | |||
112 | protected FeatureProvider getFeatureProvider() throws DataException { |
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113 | FeatureProvider data = createFeatureProvider(); |
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114 | this.getFeatureStoreProvider().getHelper().fetchFeature(data, this.resulsetEntry); |
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115 | return data;
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116 | } |
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117 | |||
118 | @Override
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119 | protected void doDispose() throws BaseException { |
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120 | if (this.resulsetEntry!=null) { |
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121 | this.close();
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122 | } |
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123 | this.featureType = null; |
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124 | } |
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125 | |||
126 | protected void close() { |
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127 | try {
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128 | this.resulsetEntry.close();
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129 | this.resulsetEntry = null; |
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130 | } catch (Exception e) { |
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131 | throw new RuntimeException(e); |
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132 | } |
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133 | } |
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134 | |||
135 | } |