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 / FeatureProviderComparator.java @ 40559
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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.Comparator; |
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27 | import java.util.Iterator; |
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28 | |||
29 | import org.gvsig.compat.CompatLocator; |
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30 | import org.gvsig.fmap.dal.exception.DataEvaluatorRuntimeException; |
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31 | import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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32 | import org.gvsig.fmap.dal.feature.FeatureQueryOrder.FeatureQueryOrderMember; |
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33 | import org.gvsig.fmap.dal.feature.FeatureType; |
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34 | import org.gvsig.fmap.dal.feature.impl.DefaultFeature; |
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35 | import org.gvsig.fmap.dal.feature.impl.DefaultFeatureStore; |
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36 | import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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37 | import org.gvsig.tools.evaluator.Evaluator; |
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38 | import org.gvsig.tools.evaluator.EvaluatorException; |
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39 | |||
40 | /*
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41 | *
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42 | * Compara dos Feature o FeatureProvider.
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43 | */
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44 | public class FeatureProviderComparator implements Comparator { |
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45 | |||
46 | private FeatureQueryOrder order;
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47 | private DefaultFeature f1;
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48 | private DefaultFeature f2;
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49 | private DefaultFeatureStore store;
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50 | private OrderElement[] elements = null; |
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51 | |||
52 | private class OrderElement { |
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53 | FeatureQueryOrderMember order = null;
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54 | int fieldIndex = -1; |
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55 | } |
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56 | |||
57 | public FeatureProviderComparator(DefaultFeatureStore store, FeatureQueryOrder order) {
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58 | this.order = order;
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59 | this.store = store;
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60 | this.f1 = new DefaultFeature(this.store); |
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61 | this.f2 = new DefaultFeature(this.store); |
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62 | } |
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63 | |||
64 | private void initElements(FeatureType type) { |
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65 | elements = new OrderElement[this.order.size()]; |
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66 | OrderElement cur; |
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67 | Iterator iter = order.iterator();
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68 | FeatureQueryOrderMember orderItem; |
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69 | int i = 0; |
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70 | while (iter.hasNext()) {
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71 | cur = new OrderElement();
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72 | cur.order = (FeatureQueryOrderMember) iter.next(); |
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73 | if (!cur.order.hasEvaluator()) {
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74 | cur.fieldIndex = type.getIndex(cur.order.getAttributeName()); |
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75 | } |
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76 | elements[i] = cur; |
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77 | i++; |
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78 | } |
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79 | |||
80 | } |
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81 | |||
82 | public int compare(Object arg0, Object arg1) { |
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83 | FeatureQueryOrderMember order; |
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84 | Comparable v1;
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85 | Comparable v2;
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86 | Object o1;
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87 | Object o2;
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88 | int v;
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89 | int fieldIndex;
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90 | |||
91 | f1.setData((FeatureProvider) arg0); |
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92 | f2.setData((FeatureProvider) arg1); |
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93 | |||
94 | if (elements == null){ |
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95 | initElements(f1.getType()); |
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96 | } |
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97 | |||
98 | OrderElement element; |
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99 | |||
100 | for (int i = 0; i < elements.length; i++) { |
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101 | element = elements[i]; |
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102 | |||
103 | if (element.order.hasEvaluator()) {
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104 | Evaluator evaluator = element.order.getEvaluator(); |
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105 | try {
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106 | o1 = evaluator.evaluate(f1); |
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107 | o2 = evaluator.evaluate(f2); |
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108 | } catch (EvaluatorException e) {
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109 | throw new DataEvaluatorRuntimeException(e); |
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110 | } |
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111 | } else {
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112 | o1 = f1.get(element.fieldIndex); |
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113 | o2 = f2.get(element.fieldIndex); |
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114 | } |
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115 | if (o1 == null) { |
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116 | if (o2 == null) { |
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117 | return 0; |
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118 | } else {
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119 | v = 1;
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120 | } |
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121 | } else {
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122 | if (o1 instanceof String && o2 instanceof String) { |
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123 | v = CompatLocator.getStringUtils().compare((String) o1,
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124 | (String) o2, true); |
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125 | } |
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126 | else if (o1 instanceof Comparable && o2 instanceof Comparable) { |
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127 | v1 = (Comparable) o1;
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128 | v2 = (Comparable) o2;
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129 | v = v1.compareTo(v2); |
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130 | } else {
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131 | v = -1;
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132 | } |
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133 | } |
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134 | |||
135 | if (v != 0) { |
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136 | if (element.order.getAscending()) {
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137 | return v;
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138 | } else {
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139 | return -v;
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140 | } |
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141 | } |
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142 | } |
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143 | return 0; |
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144 | } |
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145 | |||
146 | } |