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 @ 44750
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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 java.util.Objects; |
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27 | import org.apache.commons.lang3.Range; |
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28 | import org.gvsig.expressionevaluator.Codes; |
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29 | import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
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30 | import org.gvsig.expressionevaluator.Interpreter; |
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31 | import org.gvsig.expressionevaluator.impl.DALFunctions; |
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32 | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
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33 | import org.gvsig.fmap.dal.DALLocator; |
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34 | import org.gvsig.fmap.dal.DataManager; |
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35 | 44748 | jjdelcerro | import static org.gvsig.fmap.dal.DataManager.FUNCTION_SELECT_COUNT; |
36 | 44738 | jjdelcerro | import org.gvsig.fmap.dal.DataStore; |
37 | import org.gvsig.fmap.dal.feature.FeatureQuery; |
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38 | import org.gvsig.fmap.dal.feature.FeatureSet; |
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39 | import org.gvsig.fmap.dal.feature.FeatureStore; |
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40 | import org.gvsig.tools.dispose.DisposeUtils; |
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41 | |||
42 | /**
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43 | *
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44 | * @author jjdelcerro
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45 | */
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46 | @SuppressWarnings("UseSpecificCatch") |
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47 | public class SelectCountFunction extends AbstractFunction { |
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48 | |||
49 | public SelectCountFunction() {
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50 | super(DALFunctions.GROUP_DATA_ACCESS,
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51 | 44748 | jjdelcerro | FUNCTION_SELECT_COUNT, |
52 | 44740 | jjdelcerro | Range.between(1,2), |
53 | "Returns the number of features of the table by applying the filter indicated.\n" +
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54 | "The syntax is:\n\n"+
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55 | "SELECT * FROM table WHERE boolean_expression;\n\n"+
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56 | "Indicate a filter expression with WHERE is optional.\n"+
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57 | "The SELECT statement must always end with a semicolon.",
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58 | "SELECT COUNT(*) FROM {{table}} WHERE filter ;",
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59 | 44738 | jjdelcerro | new String[]{ |
60 | 44740 | jjdelcerro | "table - Name of the table",
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61 | "filter - boolean expression with the filter to apply",
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62 | 44738 | jjdelcerro | }, |
63 | "Long",
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64 | 44748 | jjdelcerro | false
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65 | 44738 | jjdelcerro | ); |
66 | } |
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67 | |||
68 | @Override
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69 | public boolean isHidden() { |
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70 | 44740 | jjdelcerro | return false; |
71 | 44738 | jjdelcerro | } |
72 | |||
73 | @Override
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74 | public boolean allowConstantFolding() { |
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75 | return false; |
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76 | } |
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77 | |||
78 | @Override
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79 | public boolean useArgumentsInsteadObjects() { |
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80 | return true; |
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81 | } |
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82 | |||
83 | @Override
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84 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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85 | throw new UnsupportedOperationException(); |
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86 | } |
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87 | |||
88 | @Override
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89 | public Object call(Interpreter interpreter, Codes args) throws Exception { |
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90 | |||
91 | 44750 | jjdelcerro | String storeName = (String) getObject(interpreter, args, 0); |
92 | String where = Objects.toString(args.get(1),null); |
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93 | 44738 | jjdelcerro | |
94 | FeatureStore featureStore = null;
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95 | FeatureSet set = null;
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96 | try {
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97 | DataStore store = this.getStore(storeName);
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98 | if (store == null ) { |
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99 | 44748 | jjdelcerro | throw new ExpressionRuntimeException("Cant locate the store '" + storeName + "' in function '" + FUNCTION_SELECT_COUNT + "'."); |
100 | 44738 | jjdelcerro | } |
101 | if (!(store instanceof FeatureStore)) { |
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102 | 44748 | jjdelcerro | throw new ExpressionRuntimeException("The store'" + storeName + "' is not valid for function '" + FUNCTION_SELECT_COUNT + "', a FeatureStore is required."); |
103 | 44738 | jjdelcerro | } |
104 | featureStore = (FeatureStore) store; |
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105 | if (where == null ) { |
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106 | set = featureStore.getFeatureSet(); |
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107 | } else {
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108 | FeatureQuery query = featureStore.createFeatureQuery(); |
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109 | query.addFilter(where); |
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110 | query.retrievesAllAttributes(); |
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111 | set = featureStore.getFeatureSet(query); |
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112 | } |
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113 | return set.getSize();
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114 | } catch (ExpressionRuntimeException ex) {
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115 | throw ex;
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116 | } catch (Exception ex) { |
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117 | 44748 | jjdelcerro | throw new ExpressionRuntimeException("Problems calling '" + FUNCTION_SELECT_COUNT + "' function", ex); |
118 | 44738 | jjdelcerro | } finally {
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119 | DisposeUtils.disposeQuietly(set); |
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120 | DisposeUtils.disposeQuietly(featureStore); |
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121 | } |
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122 | } |
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123 | |||
124 | protected DataStore getStore(String storeName) { |
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125 | DataManager dataManager = DALLocator.getDataManager(); |
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126 | DataStore store = dataManager.getStoresRepository().getStore(storeName); |
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127 | return store;
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128 | } |
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129 | |||
130 | } |