svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.db / org.gvsig.fmap.dal.db.jdbc / src / main / java / org / gvsig / fmap / dal / store / jdbc2 / impl / JDBCSetProvider.java @ 44058
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1 | 43020 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | *
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4 | * Copyright (C) 2007-2013 gvSIG Association.
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify it under
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7 | * the terms of the GNU General Public License as published by the Free Software
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8 | * Foundation; either version 3 of the License, or (at your option) any later
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9 | * version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful, but WITHOUT
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12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 | * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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14 | * details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License along with
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17 | * this program; if not, write to the Free Software Foundation, Inc., 51
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18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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19 | *
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20 | * For any additional information, do not hesitate to contact us at info AT
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21 | * gvsig.com, or visit our website www.gvsig.com.
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22 | */
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23 | package org.gvsig.fmap.dal.store.jdbc2.impl; |
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24 | |||
25 | import java.util.ArrayList; |
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26 | import java.util.List; |
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27 | import java.util.NoSuchElementException; |
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28 | import org.apache.commons.collections.CollectionUtils; |
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29 | import org.apache.commons.lang3.BooleanUtils; |
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30 | import org.apache.commons.lang3.StringUtils; |
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31 | |||
32 | import org.gvsig.fmap.dal.DataTypes; |
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33 | import org.gvsig.fmap.dal.exception.DataException; |
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34 | import org.gvsig.fmap.dal.feature.FeatureQuery; |
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35 | 43026 | jjdelcerro | import org.gvsig.fmap.dal.feature.FeatureQueryOrder.FeatureQueryOrderMember; |
36 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.feature.FeatureType; |
37 | |||
38 | import org.gvsig.fmap.dal.feature.spi.AbstractFeatureSetProvider; |
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39 | import org.gvsig.fmap.dal.feature.spi.AbstractFeatureStoreProvider; |
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40 | import org.gvsig.fmap.dal.store.jdbc.JDBCStoreParameters; |
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41 | import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
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42 | import org.gvsig.fmap.dal.store.jdbc2.JDBCStoreProvider; |
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43 | import org.gvsig.fmap.dal.store.jdbc2.JDBCUtils; |
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44 | import org.gvsig.fmap.dal.store.jdbc2.OperationsFactory; |
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45 | import org.gvsig.fmap.dal.store.jdbc2.ResulSetControler; |
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46 | import org.gvsig.fmap.dal.store.jdbc2.ResulSetControler.ResultSetEntry; |
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47 | import org.gvsig.fmap.dal.store.jdbc2.spi.operations.TableIsEmptyOperation; |
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48 | import org.gvsig.fmap.dal.store.jdbc2.spi.operations.ResultSetForSetProviderOperation; |
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49 | import org.gvsig.fmap.dal.store.jdbc2.spi.operations.CountOperation; |
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50 | import org.gvsig.tools.evaluator.Evaluator; |
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51 | import org.gvsig.tools.evaluator.EvaluatorFieldsInfo; |
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52 | import org.gvsig.tools.exception.BaseException; |
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53 | import org.slf4j.Logger; |
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54 | import org.slf4j.LoggerFactory; |
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55 | |||
56 | public class JDBCSetProvider extends AbstractFeatureSetProvider { |
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57 | |||
58 | 44058 | jjdelcerro | final static protected Logger LOGGER = LoggerFactory.getLogger(JDBCSetProvider.class); |
59 | 43020 | jjdelcerro | |
60 | private class EmptyJDBCIterator extends JDBCIterator { |
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61 | |||
62 | protected EmptyJDBCIterator(JDBCStoreProvider store) throws DataException { |
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63 | super(store, null, null, null); |
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64 | } |
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65 | |||
66 | @Override
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67 | protected boolean internalHasNext() { |
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68 | return false; |
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69 | } |
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70 | |||
71 | @Override
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72 | protected Object internalNext() { |
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73 | throw new NoSuchElementException(); |
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74 | } |
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75 | |||
76 | @Override
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77 | protected void doDispose() throws BaseException { |
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78 | // nothing to do
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79 | } |
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80 | |||
81 | } |
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82 | |||
83 | |||
84 | protected Long size = null; |
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85 | protected Boolean isEmpty = null; |
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86 | protected List<ResultSetEntry> resultSets; |
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87 | private int defaultFetchSize = 1000; |
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88 | |||
89 | public JDBCSetProvider(
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90 | AbstractFeatureStoreProvider store, |
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91 | JDBCHelper helper, |
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92 | FeatureQuery query, |
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93 | FeatureType featureType |
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94 | ) throws DataException {
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95 | super(store, query, featureType);
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96 | this.resultSets = new ArrayList<>(); |
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97 | } |
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98 | |||
99 | /**
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100 | * @return the defaultFetchSize
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101 | */
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102 | public int getDefaultFetchSize() { |
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103 | return defaultFetchSize;
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104 | } |
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105 | |||
106 | /**
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107 | * @param defaultFetchSize the defaultFetchSize to set
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108 | */
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109 | public void setDefaultFetchSize(int defaultFetchSize) { |
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110 | this.defaultFetchSize = defaultFetchSize;
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111 | } |
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112 | |||
113 | // @Override
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114 | // protected JDBCStoreProvider getStore() {
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115 | // return (JDBCStoreProvider) super.getStore();
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116 | // }
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117 | |||
118 | protected JDBCStoreProvider getJDBCStore() {
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119 | // Corregido el problema en AbstractFeatureSetProvider, de que getStore
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120 | // debe ser un FeatureStoreProvider y no un AbstractFeatureStoreProvider
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121 | // este metodo debe desaparecer y quedar el getStore de arriba que esta
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122 | // comentarizado
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123 | return (JDBCStoreProvider) super.getStore(); |
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124 | } |
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125 | |||
126 | protected JDBCHelper getHelper() {
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127 | return this.getJDBCStore().getHelper(); |
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128 | } |
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129 | |||
130 | protected OperationsFactory getOperations() {
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131 | return this.getHelper().getOperations(); |
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132 | } |
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133 | |||
134 | @Override
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135 | public boolean canIterateFromIndex() { |
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136 | return this.getHelper().supportOffsetInSelect(); |
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137 | } |
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138 | |||
139 | @Override
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140 | public boolean canFilter() { |
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141 | // No podemos filtrar si:
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142 | // - Hay una subquery especificada en los parametros
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143 | // - Si no soportamos geometrias y hay un filtro espacial.
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144 | //
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145 | if (this.getHelper().useSubquery()) { |
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146 | return false; |
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147 | } |
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148 | if( this.getHelper().hasSpatialFunctions() ) { |
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149 | // Como soportamos filtros espaciales, podremos hacer cualquier
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150 | // filtro que se especifique, sea alfanumerico o espacial.
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151 | return true; |
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152 | } |
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153 | |||
154 | // No se soportan filtros espaciales.
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155 | // Si se esta filtrando por un campo Geometria, retornamos false
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156 | |||
157 | Evaluator filter = getQuery().getFilter(); |
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158 | if (filter == null) { |
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159 | return true; |
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160 | } |
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161 | |||
162 | String sql = filter.getSQL();
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163 | if (StringUtils.isEmpty(sql)) {
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164 | return true; |
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165 | } |
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166 | |||
167 | EvaluatorFieldsInfo fInfo = filter.getFieldsInfo(); |
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168 | if (fInfo == null ) { |
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169 | return true; |
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170 | } |
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171 | String[] names = fInfo.getFieldNames(); |
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172 | if ( names == null) { |
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173 | return true; |
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174 | } |
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175 | |||
176 | for (String name : names) { |
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177 | int type = this.getFeatureType() |
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178 | .getAttributeDescriptor(name) |
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179 | .getType(); |
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180 | if( type == DataTypes.GEOMETRY ) {
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181 | return false; |
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182 | } |
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183 | } |
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184 | return true; |
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185 | } |
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186 | |||
187 | @Override
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188 | public boolean canOrder() { |
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189 | // No podemos ordenar si:
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190 | // - Hay una subquery especificada en los parametros
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191 | // - Si no soportamos geometrias y hay un filtro espacial.
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192 | //
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193 | if (this.getHelper().useSubquery()) { |
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194 | return false; |
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195 | } |
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196 | if( this.getHelper().hasSpatialFunctions() ) { |
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197 | // Como soportamos filtros espaciales, podremos hacer cualquier
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198 | // filtro que se especifique, sea alfanumerico o espacial.
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199 | return true; |
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200 | } |
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201 | |||
202 | FeatureQuery query = getQuery(); |
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203 | if (!query.hasOrder()) {
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204 | return true; |
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205 | } |
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206 | 43026 | jjdelcerro | for( FeatureQueryOrderMember member : query.getOrder().members() ) {
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207 | if (member.hasEvaluator()) {
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208 | String sql = member.getEvaluator().getSQL();
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209 | 43020 | jjdelcerro | if ( StringUtils.isEmpty(sql) ) {
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210 | return false; |
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211 | } |
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212 | } |
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213 | } |
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214 | return true; |
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215 | } |
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216 | |||
217 | public ResulSetControler getResulSetControler() {
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218 | return this.getHelper().getResulSetControler(); |
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219 | } |
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220 | |||
221 | @Override
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222 | protected void doDispose() throws BaseException { |
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223 | if( ! CollectionUtils.isEmpty(this.resultSets) ) { |
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224 | for( ResultSetEntry resulset : this.resultSets ) { |
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225 | JDBCUtils.closeQuietly(resulset); |
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226 | } |
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227 | } |
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228 | size = null;
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229 | isEmpty = null;
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230 | } |
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231 | |||
232 | protected int getFetchSize() { |
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233 | long pageSize = -1; |
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234 | if (getQuery() != null) { |
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235 | pageSize = getQuery().getPageSize(); |
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236 | pageSize = pageSize > Integer.MAX_VALUE ? Integer.MAX_VALUE : pageSize; |
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237 | } |
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238 | return (pageSize > 0 ? (int) pageSize : defaultFetchSize); |
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239 | } |
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240 | |||
241 | @Override
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242 | public long getSize() throws DataException { |
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243 | if (size == null) { |
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244 | JDBCStoreParameters params = this.getJDBCStore().getParameters();
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245 | String filtersql = null; |
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246 | Evaluator filter = this.getQuery().getFilter();
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247 | if( filter != null ) { |
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248 | filtersql = filter.getSQL(); |
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249 | } |
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250 | CountOperation selectCount = this.getOperations().createCount(
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251 | 44058 | jjdelcerro | this.getOperations().createTableReference(params),
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252 | 43020 | jjdelcerro | params.getBaseFilter(), |
253 | filtersql |
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254 | ); |
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255 | size = (Long) selectCount.perform();
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256 | } |
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257 | return size;
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258 | } |
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259 | |||
260 | @Override
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261 | public boolean isEmpty() throws DataException { |
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262 | if (this.isEmpty == null) { |
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263 | if (this.size == null) { |
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264 | JDBCStoreParameters params = this.getJDBCStore().getParameters();
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265 | String filtersql = null; |
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266 | Evaluator filter = this.getQuery().getFilter();
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267 | if( filter != null ) { |
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268 | filtersql = filter.getSQL(); |
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269 | } |
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270 | 44058 | jjdelcerro | TableIsEmptyOperation isEmpty_ = this.getOperations().createTableIsEmpty(
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271 | this.getOperations().createTableReference(params),
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272 | 43020 | jjdelcerro | params.getBaseFilter(), |
273 | filtersql |
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274 | ); |
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275 | 44058 | jjdelcerro | this.isEmpty = (Boolean) isEmpty_.perform(); |
276 | 43020 | jjdelcerro | } else {
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277 | this.isEmpty = (this.size < 1); |
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278 | } |
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279 | } |
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280 | return isEmpty;
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281 | } |
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282 | |||
283 | 43358 | jjdelcerro | |
284 | protected JDBCIterator createFastIterator(long index) throws DataException { |
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285 | return createFastIterator(index, 0); |
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286 | } |
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287 | |||
288 | 43020 | jjdelcerro | @Override
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289 | 43358 | jjdelcerro | protected JDBCIterator createFastIterator(long index, long elements) throws DataException { |
290 | 43020 | jjdelcerro | if( BooleanUtils.isTrue(isEmpty) ) {
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291 | return new EmptyJDBCIterator(this.getJDBCStore()); |
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292 | } |
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293 | |||
294 | JDBCStoreParameters params = this.getJDBCStore().getParameters();
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295 | FeatureType storeType = this.getStore()
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296 | .getStoreServices() |
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297 | .getProviderFeatureType(this.getFeatureType().getId());
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298 | ResultSetForSetProviderOperation createResultSet |
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299 | = getOperations().createResultSetForSetProvider( |
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300 | 44058 | jjdelcerro | this.getOperations().createTableReference(params),
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301 | 43020 | jjdelcerro | params.getBaseFilter(), |
302 | params.getBaseOrder(), |
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303 | this.getQuery(),
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304 | storeType, |
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305 | this.getFeatureType(),
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306 | 43358 | jjdelcerro | elements, |
307 | 43020 | jjdelcerro | index, |
308 | this.getDefaultFetchSize()
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309 | ); |
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310 | |||
311 | ResultSetEntry resultSetEntry = (ResultSetEntry) createResultSet.perform(); |
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312 | |||
313 | this.resultSets.add(resultSetEntry);
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314 | return new JDBCFastIterator( |
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315 | this.getJDBCStore(),
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316 | this,
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317 | this.getFeatureType(),
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318 | resultSetEntry |
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319 | ); |
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320 | } |
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321 | |||
322 | @Override
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323 | protected JDBCIterator createIterator(long index) throws DataException { |
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324 | 43358 | jjdelcerro | return createIterator(index, -1); |
325 | } |
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326 | |||
327 | @Override
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328 | protected JDBCIterator createIterator(long index, long elements) throws DataException { |
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329 | 43020 | jjdelcerro | if( BooleanUtils.isTrue(isEmpty) ) {
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330 | return new EmptyJDBCIterator(this.getJDBCStore()); |
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331 | } |
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332 | JDBCStoreParameters params = this.getJDBCStore().getParameters();
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333 | FeatureType storeType = this.getStore()
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334 | .getStoreServices() |
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335 | .getProviderFeatureType(this.getFeatureType().getId());
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336 | ResultSetForSetProviderOperation createResultSet |
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337 | = getOperations().createResultSetForSetProvider( |
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338 | 44058 | jjdelcerro | this.getOperations().createTableReference(params),
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339 | 43020 | jjdelcerro | params.getBaseFilter(), |
340 | params.getBaseOrder(), |
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341 | this.getQuery(),
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342 | storeType, |
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343 | this.getFeatureType(),
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344 | 43358 | jjdelcerro | elements, |
345 | 43020 | jjdelcerro | index, |
346 | this.getDefaultFetchSize()
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347 | ); |
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348 | |||
349 | ResultSetEntry resultSetEntry = (ResultSetEntry) createResultSet.perform(); |
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350 | this.resultSets.add(resultSetEntry);
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351 | return new JDBCIterator( |
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352 | this.getJDBCStore(),
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353 | this,
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354 | this.getFeatureType(),
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355 | resultSetEntry |
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356 | ); |
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357 | } |
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358 | |||
359 | } |