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 / expressionevaluator / impl / function / dataaccess / SelectCountFunction.java @ 46954
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1 | 44738 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | *
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4 | * Copyright (C) 2007-2020 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 | package org.gvsig.expressionevaluator.impl.function.dataaccess; |
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25 | |||
26 | import org.apache.commons.lang3.Range; |
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27 | 46678 | fdiaz | import org.apache.commons.lang3.StringUtils; |
28 | 45127 | jjdelcerro | import org.gvsig.expressionevaluator.Code; |
29 | 44738 | jjdelcerro | import org.gvsig.expressionevaluator.Codes; |
30 | 46678 | fdiaz | import org.gvsig.expressionevaluator.ExpressionBuilder; |
31 | import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_COUNT; |
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32 | 44738 | jjdelcerro | import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
33 | import org.gvsig.expressionevaluator.Interpreter; |
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34 | import org.gvsig.expressionevaluator.impl.DALFunctions; |
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35 | import org.gvsig.fmap.dal.DALLocator; |
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36 | import org.gvsig.fmap.dal.DataManager; |
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37 | 44748 | jjdelcerro | import static org.gvsig.fmap.dal.DataManager.FUNCTION_SELECT_COUNT; |
38 | 44738 | jjdelcerro | import org.gvsig.fmap.dal.DataStore; |
39 | 45366 | omartinez | import org.gvsig.expressionevaluator.ExpressionEvaluator; |
40 | 46678 | fdiaz | import org.gvsig.fmap.dal.SQLBuilder; |
41 | import static org.gvsig.fmap.dal.SQLBuilder.PROP_FEATURE_TYPE; |
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42 | import static org.gvsig.fmap.dal.SQLBuilder.PROP_SQLBUILDER; |
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43 | import static org.gvsig.fmap.dal.SQLBuilder.PROP_TABLE; |
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44 | 44738 | jjdelcerro | import org.gvsig.fmap.dal.feature.FeatureQuery; |
45 | import org.gvsig.fmap.dal.feature.FeatureSet; |
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46 | import org.gvsig.fmap.dal.feature.FeatureStore; |
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47 | 46678 | fdiaz | import org.gvsig.fmap.dal.feature.FeatureType; |
48 | 45366 | omartinez | import org.gvsig.fmap.dal.impl.expressionevaluator.DefaultFeatureExpressionEvaluator; |
49 | 44738 | jjdelcerro | import org.gvsig.tools.dispose.DisposeUtils; |
50 | |||
51 | /**
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52 | *
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53 | * @author jjdelcerro
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54 | */
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55 | @SuppressWarnings("UseSpecificCatch") |
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56 | 46088 | jjdelcerro | public class SelectCountFunction extends AbstractSelectFunction { |
57 | 44738 | jjdelcerro | |
58 | 46088 | jjdelcerro | public SelectCountFunction() {
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59 | super(DALFunctions.GROUP_DATA_ACCESS,
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60 | FUNCTION_SELECT_COUNT, |
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61 | Range.between(1, 2), |
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62 | "Returns the number of features of the table by applying the filter indicated.\n"
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63 | + "The syntax is:\n\n"
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64 | + "SELECT COUNT(*) FROM table WHERE boolean_expression;\n\n"
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65 | + "Indicate a filter expression with WHERE is optional.\n"
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66 | + "The SELECT statement must always end with a semicolon.",
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67 | "SELECT COUNT(*) FROM {{table}} WHERE filter ;",
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68 | new String[]{ |
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69 | "table - Name of the table",
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70 | "filter - boolean expression with the filter to apply",},
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71 | "Long",
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72 | 46678 | fdiaz | true
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73 | 46088 | jjdelcerro | ); |
74 | } |
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75 | 44738 | jjdelcerro | |
76 | 46088 | jjdelcerro | @Override
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77 | public boolean isHidden() { |
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78 | return false; |
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79 | } |
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80 | 44738 | jjdelcerro | |
81 | 46088 | jjdelcerro | @Override
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82 | public boolean allowConstantFolding() { |
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83 | return false; |
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84 | } |
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85 | 44738 | jjdelcerro | |
86 | 46088 | jjdelcerro | @Override
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87 | public boolean useArgumentsInsteadObjects() { |
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88 | return true; |
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89 | } |
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90 | 44738 | jjdelcerro | |
91 | 46088 | jjdelcerro | @Override
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92 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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93 | throw new UnsupportedOperationException(); |
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94 | } |
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95 | 44738 | jjdelcerro | |
96 | 46088 | jjdelcerro | private static final int TABLE = 0; |
97 | private static final int WHERE = 1; |
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98 | 44738 | jjdelcerro | |
99 | 46088 | jjdelcerro | @Override
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100 | public Object call(Interpreter interpreter, Codes args) throws Exception { |
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101 | |||
102 | 46954 | fdiaz | String storeName = this.getIdentifier(args, TABLE); |
103 | 46088 | jjdelcerro | Code where = this.getWhereCode(args, WHERE);
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104 | |||
105 | FeatureStore featureStore = null;
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106 | FeatureSet set = null;
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107 | try {
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108 | featureStore = this.getFeatureStore(storeName);
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109 | if (featureStore == null) { |
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110 | throw new ExpressionRuntimeException("Cant locate the feature store '" + storeName + "' in function '" + this.name() + "'."); |
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111 | } |
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112 | if (where == null) { |
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113 | set = featureStore.getFeatureSet(); |
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114 | } else {
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115 | FeatureQuery query = featureStore.createFeatureQuery(); |
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116 | Code where2 = removeOuterTablesReferences(interpreter, where); |
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117 | ExpressionEvaluator filter = new DefaultFeatureExpressionEvaluator(where2.toString());
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118 | filter.toSymbolTable().addSymbolTable(interpreter.getSymbolTable()); |
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119 | query.addFilter(filter); |
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120 | query.retrievesAllAttributes(); |
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121 | set = featureStore.getFeatureSet(query); |
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122 | } |
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123 | return set.getSize();
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124 | } catch (ExpressionRuntimeException ex) {
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125 | throw ex;
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126 | } catch (Exception ex) { |
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127 | throw new ExpressionRuntimeException("Problems calling '" + this.name() + "' function", ex); |
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128 | } finally {
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129 | DisposeUtils.disposeQuietly(set); |
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130 | DisposeUtils.disposeQuietly(featureStore); |
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131 | 45127 | jjdelcerro | } |
132 | } |
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133 | 44738 | jjdelcerro | |
134 | 46678 | fdiaz | @Override
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135 | public ExpressionBuilder.Value toValue(ExpressionBuilder builder, Codes args) {
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136 | try {
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137 | SQLBuilder sqlBuilder = (SQLBuilder) builder.getProperty(PROP_SQLBUILDER); |
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138 | if(sqlBuilder == null){ |
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139 | return super.toValue(builder, args); |
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140 | } |
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141 | FeatureType featureType = null;
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142 | SQLBuilder.SelectBuilder select = sqlBuilder.createSelectBuilder(); |
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143 | String builderTableName = (String) builder.getProperty(SQLBuilder.PROP_TABLENAME); |
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144 | |||
145 | 46954 | fdiaz | String storeName = this.getIdentifier(args, TABLE); |
146 | 46678 | fdiaz | Code where = this.getWhereCode(args, WHERE);
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147 | |||
148 | if (storeName != null) { |
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149 | select.from().table().name(storeName); |
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150 | } |
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151 | |||
152 | SQLBuilder.TableNameBuilder table = select.from().table(); |
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153 | String tableName = table.getName();
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154 | |||
155 | select.column().value(builder.function(FUNCTION_COUNT, builder.custom("*")));
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156 | |||
157 | if (where != null) { |
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158 | ExpressionBuilder.Value value = where.toValue(builder); |
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159 | select.where().value(value); |
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160 | sqlBuilder.setProperties(value, null, SQLBuilder.PROP_ADD_TABLE_NAME_TO_COLUMNS, true); |
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161 | } |
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162 | |||
163 | if (featureType == null) { |
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164 | if (StringUtils.equalsIgnoreCase(builderTableName, tableName)) {
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165 | featureType = (FeatureType) builder.getProperty(SQLBuilder.PROP_FEATURE_TYPE); |
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166 | } else {
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167 | DataManager dataManager = DALLocator.getDataManager(); |
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168 | featureType = dataManager.getStoresRepository().getFeatureType(tableName); |
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169 | } |
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170 | } |
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171 | |||
172 | sqlBuilder.setProperties( |
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173 | select, |
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174 | null,
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175 | PROP_FEATURE_TYPE, featureType, |
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176 | PROP_TABLE, table |
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177 | ); |
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178 | |||
179 | return builder.group(select);
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180 | } catch (Exception ex) { |
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181 | return super.toValue(builder, args); |
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182 | } |
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183 | } |
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184 | |||
185 | 44738 | jjdelcerro | } |