root / trunk / extensions / extGeoProcessing / src / com / iver / cit / gvsig / geoprocess / buffer / fmap / AttributeBufferVisitor.java @ 5412
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1 | 5412 | azabala | /*
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2 | * Created on 02-feb-2006
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3 | *
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4 | * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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5 | *
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6 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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7 | *
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8 | * This program is free software; you can redistribute it and/or
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9 | * modify it under the terms of the GNU General Public License
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10 | * as published by the Free Software Foundation; either version 2
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11 | * of the License, or (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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21 | *
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22 | * For more information, contact:
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23 | *
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24 | * Generalitat Valenciana
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25 | * Conselleria d'Infraestructures i Transport
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26 | * Av. Blasco Ib??ez, 50
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27 | * 46010 VALENCIA
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28 | * SPAIN
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29 | *
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30 | * +34 963862235
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31 | * gvsig@gva.es
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32 | * www.gvsig.gva.es
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33 | *
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34 | * or
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35 | *
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36 | * IVER T.I. S.A
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37 | * Salamanca 50
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38 | * 46005 Valencia
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39 | * Spain
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40 | *
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41 | * +34 963163400
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42 | * dac@iver.es
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43 | */
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44 | /* CVS MESSAGES:
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45 | *
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46 | * $Id$
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47 | * $Log$
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48 | * Revision 1.1 2006-05-24 21:14:41 azabala
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49 | * primera version en cvs despues de refactoring orientado a crear un framework extensible de geoprocessing
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50 | *
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51 | * Revision 1.8 2006/05/01 19:18:09 azabala
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52 | * revisi?n general del buffer (a?adidos anillos concentricos, buffers interiores y exteriores, etc)
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53 | *
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54 | * Revision 1.7 2006/03/28 16:27:16 azabala
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55 | * *** empty log message ***
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56 | *
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57 | * Revision 1.6 2006/03/07 21:01:33 azabala
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58 | * *** empty log message ***
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59 | *
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60 | * Revision 1.5 2006/03/06 19:48:39 azabala
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61 | * *** empty log message ***
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62 | *
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63 | * Revision 1.2 2006/03/05 19:57:05 azabala
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64 | * *** empty log message ***
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65 | *
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66 | * Revision 1.1 2006/02/17 16:31:38 azabala
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67 | * *** empty log message ***
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68 | *
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69 | * Revision 1.3 2006/02/12 21:02:44 azabala
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70 | * *** empty log message ***
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71 | *
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72 | * Revision 1.2 2006/02/09 16:01:06 azabala
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73 | * First version in CVS
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74 | *
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75 | * Revision 1.1 2006/02/02 19:46:01 azabala
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76 | * First version in CVS
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77 | *
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78 | *
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79 | */
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80 | package com.iver.cit.gvsig.geoprocess.buffer.fmap; |
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81 | |||
82 | import com.hardcode.gdbms.engine.values.NumericValue; |
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83 | import com.iver.cit.gvsig.fmap.DriverException; |
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84 | import com.iver.cit.gvsig.fmap.core.IGeometry; |
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85 | import com.iver.cit.gvsig.fmap.layers.FLayer; |
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86 | import com.iver.cit.gvsig.fmap.layers.SelectableDataSource; |
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87 | import com.iver.cit.gvsig.fmap.layers.layerOperations.AlphanumericData; |
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88 | import com.iver.cit.gvsig.fmap.layers.layerOperations.VectorialData; |
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89 | import com.iver.cit.gvsig.fmap.operations.strategies.VisitException; |
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90 | import com.iver.cit.gvsig.geoprocess.core.fmap.GeoprocessException; |
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91 | import com.iver.cit.gvsig.geoprocess.core.fmap.GeoprocessingResultsProcessor; |
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92 | import com.vividsolutions.jts.geom.Geometry; |
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93 | /**
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94 | * FeatureVisitor that computes buffer geometries from original geometrie
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95 | * and an attribute value of IFeature
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96 | * @author azabala
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97 | *
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98 | */
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99 | public class AttributeBufferVisitor extends BufferVisitor { |
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100 | /**
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101 | * Attribute name from which visitor will get buffer distances
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102 | */
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103 | private String attributeName; |
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104 | /**
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105 | * It allows visitor to get attribute values link to geometries
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106 | */
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107 | private SelectableDataSource recordset;
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108 | /**
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109 | * Processes individual buffer results
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110 | * (we could persist them in a datastore, caching them, etc
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111 | */
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112 | private GeoprocessingResultsProcessor resultProcessor;
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113 | |||
114 | |||
115 | /**
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116 | * Constructor
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117 | * @param attributeName
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118 | * @param recordset
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119 | */
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120 | public AttributeBufferVisitor(String attributeName) throws GeoprocessException{ |
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121 | this.attributeName = attributeName;
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122 | } |
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123 | |||
124 | public void stop(FLayer layer) { |
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125 | resultProcessor.finish(); |
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126 | } |
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127 | |||
128 | public boolean start(FLayer layer) { |
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129 | if(layer instanceof AlphanumericData && layer instanceof VectorialData){ |
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130 | try {
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131 | this.recordset = ((AlphanumericData)layer).getRecordset();
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132 | } catch (DriverException e) {
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133 | return false;//must we throw an Exception?? |
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134 | } |
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135 | return true; |
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136 | } |
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137 | return false; |
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138 | } |
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139 | |||
140 | public double getBufferDistance(IGeometry g, int index){ |
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141 | NumericValue value = null;
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142 | try {
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143 | int fieldIndex = recordset.getFieldIndexByName(attributeName);
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144 | //we could throw an AttributeBufferException, or
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145 | //we could check preconditions in BufferGeoprocess
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146 | //TODO to check attribute is a NUMBER
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147 | value = (NumericValue) recordset. |
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148 | getFieldValue(index, fieldIndex); |
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149 | } catch (com.hardcode.gdbms.engine.data.driver.DriverException e) {
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150 | return -1d; |
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151 | } |
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152 | //TODO catch ClassCastException
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153 | return value.doubleValue();
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154 | } |
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155 | |||
156 | public String getProcessDescription() { |
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157 | return "Computing buffers applying distances from attribute"; |
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158 | } |
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159 | } |