svn-gvsig-desktop / branches / v2_0_0_prep / libraries / libFMap_data / src / org / gvsig / fmap / data / feature / impl / DefaultFeatureSelection.java @ 24178
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1 | 23824 | cordinyana | /* gvSIG. Geographic Information System of the Valencian Government
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2 | *
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3 | * Copyright (C) 2007-2008 Infrastructures and Transports Department
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4 | * of the Valencian Gobernment (CIT)
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5 | 23894 | jjdelcerro | *
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6 | 23824 | cordinyana | * 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 2
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9 | * of the License, or (at your option) any later version.
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10 | 23894 | jjdelcerro | *
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11 | 23824 | cordinyana | * 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 | 23894 | jjdelcerro | *
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16 | 23824 | cordinyana | * 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 | 23894 | jjdelcerro | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | 23824 | cordinyana | * MA 02110-1301, USA.
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20 | 23894 | jjdelcerro | *
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21 | 23824 | cordinyana | */
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22 | |||
23 | /*
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24 | * AUTHORS (In addition to CIT):
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25 | * 2008 {DiSiD Technologies} {Implement data selection}
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26 | */
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27 | 23754 | jjdelcerro | package org.gvsig.fmap.data.feature.impl; |
28 | |||
29 | 23824 | cordinyana | import java.util.Iterator; |
30 | import java.util.List; |
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31 | |||
32 | 23928 | cordinyana | import org.gvsig.fmap.data.DataStoreNotification; |
33 | import org.gvsig.fmap.data.exceptions.DataException; |
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34 | import org.gvsig.fmap.data.feature.*; |
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35 | 24023 | cordinyana | import org.slf4j.Logger; |
36 | import org.slf4j.LoggerFactory; |
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37 | 23754 | jjdelcerro | |
38 | 23824 | cordinyana | /**
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39 | 23928 | cordinyana | * Default implementation of the FeatureSelection interface. Internally, only
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40 | * FeatureReference values are stored.
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41 | *
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42 | * This implementation performs better if used with the selection related
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43 | * methods: select, deselect and isSelected ones.
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44 | 24023 | cordinyana | *
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45 | 23824 | cordinyana | * @author <a href="mailto:cordin@disid.com">C?sar Ordi?ana</a>
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46 | */
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47 | 23928 | cordinyana | public class DefaultFeatureSelection extends DefaultFeatureReferenceSelection |
48 | 23824 | cordinyana | implements FeatureSelection {
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49 | 23754 | jjdelcerro | |
50 | 24023 | cordinyana | final Logger logger = LoggerFactory |
51 | .getLogger(DefaultFeatureSelection.class); |
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52 | 23754 | jjdelcerro | |
53 | 23824 | cordinyana | /**
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54 | * Creates a DefaultFeatureSelection, with a FeatureStore.
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55 | 24023 | cordinyana | *
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56 | 23824 | cordinyana | * @param featureStore
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57 | * the FeatureStore to load Features from
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58 | 24023 | cordinyana | *
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59 | 23928 | cordinyana | * @see AbstractSetBasedDataSelection#DefaultSelection(int)
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60 | 23824 | cordinyana | */
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61 | public DefaultFeatureSelection(FeatureStore featureStore) {
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62 | 23928 | cordinyana | super(featureStore);
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63 | 23824 | cordinyana | } |
64 | 23754 | jjdelcerro | |
65 | 23824 | cordinyana | /**
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66 | * Creates a DefaultFeatureSelection, with a FeatureStore.
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67 | 24023 | cordinyana | *
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68 | 23824 | cordinyana | * @param featureStore
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69 | * the FeatureStore to load Features from
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70 | * @param totalSize
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71 | * the maximum number of Features that may be selected
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72 | */
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73 | 23928 | cordinyana | public DefaultFeatureSelection(FeatureStore featureStore, long totalSize) { |
74 | super(featureStore, totalSize);
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75 | 23824 | cordinyana | } |
76 | 23754 | jjdelcerro | |
77 | 23928 | cordinyana | public boolean select(Feature feature) { |
78 | if (feature == null) { |
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79 | return false; |
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80 | } |
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81 | return select(feature.getReference());
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82 | 23824 | cordinyana | } |
83 | 23754 | jjdelcerro | |
84 | 23928 | cordinyana | public boolean select(FeatureSet features) throws DataException { |
85 | // TODO: verificar si las features son del mismo FeatureStore
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86 | boolean change = false; |
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87 | 24178 | cordinyana | disableNotifications(); |
88 | 23928 | cordinyana | for (Iterator iter = features.fastIterator(); iter.hasNext();) { |
89 | change |= select((Feature) iter.next()); |
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90 | } |
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91 | enableNotifications(); |
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92 | if (change) {
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93 | 24178 | cordinyana | notifyObservers(DataStoreNotification.SELECTION_CHANGE); |
94 | 23928 | cordinyana | } |
95 | return change;
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96 | } |
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97 | |||
98 | public boolean deselect(Feature feature) { |
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99 | if (feature == null) { |
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100 | return false; |
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101 | } |
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102 | return deselect(feature.getReference());
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103 | } |
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104 | |||
105 | public boolean deselect(FeatureSet features) throws DataException { |
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106 | // TODO: verificar si las features son del mismo FeatureStore
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107 | boolean change = false; |
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108 | 24178 | cordinyana | disableNotifications(); |
109 | 23928 | cordinyana | for (Iterator iter = features.fastIterator(); iter.hasNext();) { |
110 | change |= deselect((Feature) iter.next()); |
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111 | } |
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112 | enableNotifications(); |
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113 | if (change) {
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114 | 24178 | cordinyana | notifyObservers(DataStoreNotification.SELECTION_CHANGE); |
115 | 23928 | cordinyana | } |
116 | return change;
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117 | } |
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118 | |||
119 | public boolean isSelected(Feature feature) { |
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120 | if (feature == null) { |
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121 | return false; |
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122 | } |
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123 | return isSelected(feature.getReference());
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124 | } |
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125 | |||
126 | 23824 | cordinyana | public FeatureType getDefaultFeatureType() {
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127 | 23928 | cordinyana | try {
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128 | return getFeatureStore().getDefaultFeatureType();
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129 | } catch (DataException ex) {
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130 | logger.error("Error getting the default feature type "
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131 | + "of the FeatureStore: " + getFeatureStore(), ex);
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132 | } |
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133 | return null; |
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134 | 23824 | cordinyana | } |
135 | 23754 | jjdelcerro | |
136 | 23824 | cordinyana | public List getFeatureTypes() { |
137 | // TODO: implement
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138 | throw new UnsupportedOperationException("Not implemented"); |
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139 | } |
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140 | 23754 | jjdelcerro | |
141 | 23928 | cordinyana | public long getSize() throws DataException { |
142 | 23824 | cordinyana | return getSelectedCount();
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143 | } |
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144 | |||
145 | 23928 | cordinyana | public boolean isEmpty() throws DataException { |
146 | return getSelectedCount() == 0; |
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147 | } |
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148 | |||
149 | 23824 | cordinyana | /**
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150 | 23928 | cordinyana | * Returns the list of selected values, or the deselected ones if the
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151 | * selection has been reversed.
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152 | */
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153 | public Iterator iterator() { |
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154 | return iterator(0); |
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155 | } |
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156 | |||
157 | /**
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158 | * Returns the list of selected values, or the deselected ones if the
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159 | * selection has been reversed.
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160 | *
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161 | 23824 | cordinyana | * WARN: not very good performance implementation.
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162 | */
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163 | 23928 | cordinyana | public Iterator iterator(long index) { |
164 | // TODO: evaluar la opci?n de obtener las features
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165 | // mediante una query al FeatureStore.
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166 | 24023 | cordinyana | |
167 | 23928 | cordinyana | Iterator iter = referenceIterator();
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168 | for (long l = 0; l < index; l++) { |
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169 | 23824 | cordinyana | iter.next(); |
170 | } |
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171 | return new FeatureIteratorFacade(iter); |
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172 | } |
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173 | |||
174 | 23928 | cordinyana | /**
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175 | * Returns the list of selected values, or the deselected ones if the
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176 | * selection has been reversed.
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177 | *
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178 | * WARN: not really a fast implementation.
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179 | */
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180 | public Iterator fastIterator() { |
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181 | return fastIterator(0); |
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182 | 23824 | cordinyana | } |
183 | |||
184 | 23928 | cordinyana | /**
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185 | * Returns the list of selected values, or the deselected ones if the
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186 | * selection has been reversed.
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187 | *
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188 | * WARN: not really a fast implementation.
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189 | */
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190 | public Iterator fastIterator(long index) { |
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191 | return iterator(index);
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192 | } |
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193 | 24151 | cordinyana | |
194 | /**
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195 | * Facade over a Iterator of FeatureReferences, to return Features instead.
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196 | *
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197 | * @author <a href="mailto:cordin@disid.com">C?sar Ordi?ana</a>
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198 | */
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199 | public class FeatureIteratorFacade implements Iterator { |
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200 | |||
201 | final Logger logger = LoggerFactory |
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202 | .getLogger(FeatureIteratorFacade.class); |
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203 | |||
204 | private Iterator refIterator; |
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205 | |||
206 | public FeatureIteratorFacade(Iterator refIterator) { |
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207 | this.refIterator = refIterator;
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208 | } |
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209 | |||
210 | public boolean hasNext() { |
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211 | return refIterator.hasNext();
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212 | } |
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213 | |||
214 | public Object next() { |
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215 | FeatureReference ref = nextFeatureReference(); |
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216 | try {
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217 | return getFeature(ref);
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218 | } catch (DataException ex) {
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219 | logger.error( |
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220 | "Error loading the Feature with FeatureReference: "
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221 | + ref, ex); |
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222 | |||
223 | return null; |
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224 | } |
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225 | } |
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226 | |||
227 | /**
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228 | * Returns the next FeatureReference.
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229 | *
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230 | * @return the next FeatureReference
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231 | */
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232 | public FeatureReference nextFeatureReference() {
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233 | return (FeatureReference) refIterator.next();
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234 | } |
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235 | |||
236 | public void remove() { |
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237 | refIterator.remove(); |
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238 | } |
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239 | |||
240 | /**
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241 | * Returns a Feature for the FeatureReference.
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242 | */
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243 | protected Feature getFeature(FeatureReference ref) throws DataException { |
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244 | return ref.getFeature();
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245 | } |
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246 | } |
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247 | 23824 | cordinyana | } |