svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.plugin / org.gvsig.app / org.gvsig.app.mainplugin / src / main / java / org / gvsig / app / project / ProjectSymbolTable.java @ 43987
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1 | 43987 | jjdelcerro | package org.gvsig.app.project; |
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2 | |||
3 | import java.io.File; |
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4 | import java.io.FileInputStream; |
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5 | import java.util.HashMap; |
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6 | import java.util.Map; |
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7 | import java.util.Properties; |
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8 | import org.apache.commons.io.IOUtils; |
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9 | import org.apache.commons.lang3.Range; |
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10 | import org.gvsig.app.project.documents.view.ViewDocument; |
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11 | import org.gvsig.app.project.documents.view.ViewManager; |
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12 | import org.gvsig.expressionevaluator.ExpressionEvaluatorLocator; |
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13 | import org.gvsig.expressionevaluator.ExpressionEvaluatorManager; |
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14 | import org.gvsig.expressionevaluator.Interpreter; |
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15 | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
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16 | import org.gvsig.expressionevaluator.spi.AbstractSymbolTable; |
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17 | import org.gvsig.fmap.dal.feature.Feature; |
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18 | import org.gvsig.fmap.dal.feature.FeatureQuery; |
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19 | import org.gvsig.fmap.dal.feature.FeatureSelection; |
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20 | import org.gvsig.fmap.dal.feature.FeatureSet; |
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21 | import org.gvsig.fmap.dal.feature.FeatureStore; |
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22 | import org.gvsig.fmap.mapcontext.layers.FLayer; |
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23 | import org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect; |
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24 | |||
25 | /**
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26 | *
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27 | * @author jjdelcerro
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28 | */
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29 | @SuppressWarnings("UseSpecificCatch") |
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30 | public class ProjectSymbolTable extends AbstractSymbolTable { |
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31 | |||
32 | private abstract class CachedValue<T> { |
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33 | |||
34 | T value = null;
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35 | long lastAccess = 0; |
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36 | |||
37 | protected abstract void reload(); |
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38 | |||
39 | public boolean isExpired() { |
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40 | long now = System.currentTimeMillis(); |
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41 | return now - lastAccess > 3000; |
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42 | } |
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43 | |||
44 | public T get() {
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45 | if (isExpired()) {
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46 | reload(); |
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47 | } |
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48 | lastAccess = System.currentTimeMillis();
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49 | return value;
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50 | } |
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51 | } |
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52 | |||
53 | private class ProjectValue extends CachedValue<Project> { |
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54 | |||
55 | @Override
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56 | protected void reload() { |
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57 | value = ProjectManager.getInstance().getCurrentProject(); |
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58 | } |
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59 | |||
60 | } |
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61 | |||
62 | private class PropertiesValue extends CachedValue<Map<File, Properties>> { |
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63 | |||
64 | @Override
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65 | protected void reload() { |
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66 | value = new HashMap<>(); |
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67 | } |
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68 | } |
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69 | |||
70 | private class CurrentProjectFunction extends AbstractFunction { |
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71 | |||
72 | public CurrentProjectFunction() {
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73 | super(
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74 | "Project",
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75 | "project",
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76 | Range.is(0),
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77 | "Access to the current project loaded in gvSIG desktop.\n",
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78 | "project()",
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79 | null,
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80 | "Project"
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81 | ); |
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82 | } |
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83 | |||
84 | @Override
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85 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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86 | return currentProject.get();
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87 | } |
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88 | |||
89 | } |
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90 | |||
91 | private class FirstSelectedFeatureFunction extends AbstractFunction { |
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92 | |||
93 | public FirstSelectedFeatureFunction() {
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94 | super(
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95 | "Project",
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96 | "firstSelectedFeature",
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97 | Range.between(3, 4), |
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98 | "Access to the first selected feature of the layer, and "
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99 | + "return the value of the attribute.",
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100 | "firstSelectedFeature({{view}}, layer, attribute, defaulValue)",
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101 | new String[]{ |
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102 | "view - String value with the name of a view",
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103 | "layer - String value with the name of a layer in the indicated view",
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104 | "attribute - String value with the name of the attribute in the indicated layer",
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105 | "defaultValue - Optional. Value to use if the indicated "
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106 | + "attribute can not be accessed. For example, if the "
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107 | + "view or layer does not exist, or it does not have "
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108 | + "selected elements."
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109 | }, |
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110 | "Object"
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111 | ); |
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112 | } |
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113 | |||
114 | @Override
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115 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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116 | Object defaultValue = null; |
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117 | String viewName = getStr(args, 0); |
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118 | String layerName = getStr(args, 1); |
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119 | String attrName = getStr(args, 2); |
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120 | if (args.length == 4) { |
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121 | defaultValue = getObject(args, 3);
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122 | } |
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123 | try {
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124 | Project project = currentProject.get(); |
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125 | ViewDocument view = (ViewDocument) project.getDocument(viewName, ViewManager.TYPENAME); |
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126 | if (view == null) { |
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127 | return defaultValue;
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128 | } |
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129 | FLayer layer = view.getLayer(layerName); |
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130 | if (!(layer instanceof FLyrVect)) { |
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131 | return defaultValue;
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132 | } |
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133 | FeatureSelection selection = ((FLyrVect) layer).getFeatureStore().getFeatureSelection(); |
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134 | if (selection == null || selection.isEmpty()) { |
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135 | return defaultValue;
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136 | } |
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137 | Feature feature = selection.first(); |
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138 | if (feature == null) { |
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139 | return defaultValue;
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140 | } |
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141 | return feature.get(attrName);
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142 | } catch (Exception ex) { |
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143 | return defaultValue;
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144 | } |
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145 | } |
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146 | |||
147 | } |
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148 | |||
149 | private class FirstFeatureFunction extends AbstractFunction { |
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150 | |||
151 | public FirstFeatureFunction() {
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152 | super(
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153 | "Project",
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154 | "firstFeature",
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155 | Range.between(3, 6), |
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156 | "Access to the first feature of the layer, and "
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157 | + "return the value of the attribute.",
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158 | "firstFeature({{view}}, layer, attribute, filter, order, defaulValue)",
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159 | new String[]{ |
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160 | "view - String value with the name of a view",
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161 | "layer - String value with the name of a layer in the indicated view",
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162 | "attribute - String value with the name of the attribute in the indicated layer",
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163 | "filter - Optional. String value with a filter expression",
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164 | "order - Optional. String value with the order. must be a string with the names of separate fields with commas",
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165 | "defaultValue - Optional. Value to use if the indicated "
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166 | + "attribute can not be accessed. For example, if the "
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167 | + "view or layer does not exist."
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168 | }, |
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169 | "Object"
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170 | ); |
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171 | } |
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172 | |||
173 | @Override
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174 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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175 | Object defaultValue = null; |
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176 | String filter = null; |
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177 | String order = null; |
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178 | String viewName = getStr(args, 0); |
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179 | String layerName = getStr(args, 1); |
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180 | String attrName = getStr(args, 2); |
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181 | switch(args.length ) {
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182 | case 4: |
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183 | filter = getStr(args, 3);
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184 | break;
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185 | case 5: |
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186 | filter = getStr(args, 3);
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187 | order = getStr(args, 4);
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188 | break;
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189 | case 6: |
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190 | filter = getStr(args, 3);
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191 | order = getStr(args, 4);
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192 | defaultValue = getObject(args, 6);
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193 | break;
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194 | } |
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195 | try {
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196 | Project project = currentProject.get(); |
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197 | ViewDocument view = (ViewDocument) project.getDocument(viewName, ViewManager.TYPENAME); |
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198 | if (view == null) { |
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199 | return defaultValue;
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200 | } |
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201 | FLayer layer = view.getLayer(layerName); |
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202 | if (!(layer instanceof FLyrVect)) { |
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203 | return defaultValue;
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204 | } |
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205 | FeatureStore store = ((FLyrVect) layer).getFeatureStore(); |
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206 | FeatureSet set; |
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207 | if( filter==null && order==null ) { |
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208 | set = store.getFeatureSet(); |
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209 | } else {
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210 | FeatureQuery query = store.createFeatureQuery(); |
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211 | if( filter != null ) { |
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212 | query.addFilter(filter); |
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213 | } |
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214 | if( order!=null ) { |
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215 | query.getOrder().add(order); |
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216 | } |
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217 | set = store.getFeatureSet(query); |
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218 | } |
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219 | Feature feature = set.first(); |
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220 | if (feature == null) { |
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221 | return defaultValue;
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222 | } |
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223 | return feature.get(attrName);
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224 | } catch (Exception ex) { |
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225 | return defaultValue;
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226 | } |
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227 | } |
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228 | |||
229 | } |
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230 | |||
231 | private class ViewFunction extends AbstractFunction { |
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232 | |||
233 | public ViewFunction() {
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234 | super(
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235 | "Project",
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236 | "view",
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237 | Range.is(1),
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238 | "Access to the indicated view",
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239 | "view({{viewName}})",
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240 | new String[]{ |
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241 | "view - String value with the name of a view"
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242 | }, |
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243 | "DocumentView"
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244 | ); |
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245 | } |
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246 | |||
247 | @Override
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248 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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249 | String viewName = getStr(args, 0); |
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250 | Project project = currentProject.get(); |
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251 | ViewDocument view = (ViewDocument) project.getDocument(viewName, ViewManager.TYPENAME); |
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252 | return view;
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253 | } |
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254 | |||
255 | } |
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256 | |||
257 | private class PropertyFunction extends AbstractFunction { |
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258 | |||
259 | public PropertyFunction() {
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260 | super(
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261 | "Project",
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262 | "property",
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263 | Range.between(2, 3), |
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264 | "Access to a property value in a properties file. If the"
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265 | + "indicated filename is not absolute, access it relative"
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266 | + "to the project.",
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267 | "property({{filename}}, name, defaultValue)",
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268 | new String[]{ |
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269 | "filename - String value with the name of the properties file",
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270 | "name - String value with the name of the property to retrieve from the file",
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271 | "defaultValue - Optional. Default value if can't access the file or the property",},
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272 | "String"
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273 | ); |
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274 | } |
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275 | |||
276 | @Override
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277 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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278 | String filename = getStr(args, 0); |
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279 | String name = getStr(args, 1); |
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280 | String defaultValue = null; |
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281 | if (args.length == 3) { |
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282 | defaultValue = getStr(args, 2);
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283 | } |
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284 | |||
285 | File file = new File(filename); |
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286 | if (!file.isAbsolute()) {
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287 | Project project = currentProject.get(); |
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288 | if (project.getFile() == null) { |
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289 | return defaultValue;
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290 | } |
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291 | file = new File(project.getFile().getParent(), filename); |
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292 | } |
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293 | Map<File, Properties> x = propertiesFiles.get(); |
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294 | Properties properties = x.get(file);
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295 | if (properties == null) { |
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296 | properties = new Properties(); |
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297 | FileInputStream in = null; |
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298 | try {
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299 | in = new FileInputStream(file); |
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300 | properties.load(in); |
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301 | } catch (Exception ex) { |
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302 | return defaultValue;
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303 | } finally {
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304 | IOUtils.closeQuietly(in); |
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305 | } |
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306 | x.put(file, properties); |
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307 | } |
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308 | String value = properties.getProperty(name, defaultValue);
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309 | return value;
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310 | } |
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311 | |||
312 | } |
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313 | |||
314 | ProjectValue currentProject = new ProjectValue();
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315 | PropertiesValue propertiesFiles = new PropertiesValue();
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316 | |||
317 | @SuppressWarnings("OverridableMethodCallInConstructor") |
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318 | public ProjectSymbolTable() {
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319 | super("Project"); |
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320 | this.addFunction(new CurrentProjectFunction()); |
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321 | this.addFunction(new FirstSelectedFeatureFunction()); |
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322 | this.addFunction(new FirstFeatureFunction()); |
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323 | this.addFunction(new ViewFunction()); |
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324 | this.addFunction(new PropertyFunction()); |
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325 | } |
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326 | |||
327 | public static void selfRegister() { |
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328 | ExpressionEvaluatorManager manager = ExpressionEvaluatorLocator.getManager(); |
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329 | manager.registerSymbolTable(new ProjectSymbolTable(), true); |
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330 | } |
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331 | } |