svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.spi / src / main / java / org / gvsig / fmap / dal / feature / spi / AbstractFeatureSetProvider.java @ 47198
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1 | 40559 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | 40435 | jjdelcerro | *
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4 | 40559 | jjdelcerro | * Copyright (C) 2007-2013 gvSIG Association.
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5 | *
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6 | 40435 | jjdelcerro | * 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 | 40559 | jjdelcerro | * as published by the Free Software Foundation; either version 3
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9 | 40435 | jjdelcerro | * of the License, or (at your option) any later version.
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10 | 40559 | jjdelcerro | *
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11 | 40435 | jjdelcerro | * 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 | 40559 | jjdelcerro | *
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16 | 40435 | jjdelcerro | * 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 | 40559 | jjdelcerro | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | 40435 | jjdelcerro | * MA 02110-1301, USA.
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20 | 40559 | jjdelcerro | *
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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 | 40435 | jjdelcerro | */
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24 | package org.gvsig.fmap.dal.feature.spi; |
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25 | |||
26 | import java.util.Iterator; |
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27 | 47198 | jjdelcerro | import org.apache.commons.lang3.builder.ToStringBuilder; |
28 | 40435 | jjdelcerro | |
29 | import org.gvsig.fmap.dal.exception.DataException; |
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30 | import org.gvsig.fmap.dal.feature.FeatureQuery; |
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31 | import org.gvsig.fmap.dal.feature.FeatureType; |
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32 | import org.gvsig.tools.dispose.DisposableIterator; |
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33 | import org.gvsig.tools.dispose.impl.AbstractDisposable; |
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34 | 47198 | jjdelcerro | import org.slf4j.Logger; |
35 | import org.slf4j.LoggerFactory; |
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36 | 40435 | jjdelcerro | |
37 | /**
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38 | * Base implementation for {@link FeatureSetProvider}s, adding some utility
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39 | * methods.
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40 | *
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41 | * @author 2009- <a href="cordinyana@gvsig.org">C?sar Ordi?ana</a> - gvSIG team
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42 | */
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43 | public abstract class AbstractFeatureSetProvider extends AbstractDisposable |
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44 | implements FeatureSetProvider {
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45 | |||
46 | 47198 | jjdelcerro | protected static final Logger LOGGER = LoggerFactory.getLogger(AbstractFeatureSetProvider.class); |
47 | |||
48 | 40435 | jjdelcerro | private final AbstractFeatureStoreProvider store; |
49 | private final FeatureQuery query; |
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50 | private final FeatureType featureType; |
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51 | |||
52 | /**
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53 | * Creates a new {@link FeatureSetProvider}.
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54 | *
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55 | * @param store
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56 | * the underlying {@link FeatureStoreProvider} to get the data
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57 | * from
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58 | * @param query
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59 | * used to create the {@link FeatureSetProvider}
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60 | * @param featureType
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61 | * the type of feature to get
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62 | */
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63 | public AbstractFeatureSetProvider(AbstractFeatureStoreProvider store,
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64 | FeatureQuery query, FeatureType featureType) { |
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65 | this.store = store;
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66 | this.query = query;
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67 | this.featureType = featureType;
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68 | } |
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69 | |||
70 | /**
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71 | * Return the {@link AbstractFeatureStoreProvider}.
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72 | *
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73 | * @return the store
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74 | */
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75 | protected AbstractFeatureStoreProvider getStore() {
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76 | return store;
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77 | } |
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78 | |||
79 | /**
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80 | * Returns the {@link FeatureQuery} used to create this set.
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81 | *
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82 | * @return the query
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83 | */
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84 | protected FeatureQuery getQuery() {
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85 | return query;
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86 | } |
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87 | 43377 | jjdelcerro | |
88 | 40435 | jjdelcerro | /**
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89 | * Returns the type of features to load.
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90 | *
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91 | * @return the featureType
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92 | */
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93 | protected FeatureType getFeatureType() {
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94 | return featureType;
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95 | } |
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96 | 43377 | jjdelcerro | |
97 | 43358 | jjdelcerro | @Override
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98 | 40435 | jjdelcerro | public final DisposableIterator fastIterator() throws DataException { |
99 | return fastIterator(0); |
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100 | } |
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101 | |||
102 | public final DisposableIterator fastIterator(long index) |
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103 | throws DataException {
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104 | return createFastIterator(index);
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105 | } |
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106 | |||
107 | 43358 | jjdelcerro | @Override
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108 | public final DisposableIterator fastIterator(long index, long elements) throws DataException { |
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109 | return createFastIterator(index, elements);
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110 | } |
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111 | |||
112 | @Override
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113 | 40435 | jjdelcerro | public final DisposableIterator iterator() throws DataException { |
114 | return iterator(0); |
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115 | } |
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116 | |||
117 | public final DisposableIterator iterator(long index) throws DataException { |
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118 | return createIterator(index);
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119 | } |
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120 | |||
121 | 43358 | jjdelcerro | @Override
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122 | public final DisposableIterator iterator(long index, long elements) throws DataException { |
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123 | return createIterator(index, elements);
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124 | } |
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125 | |||
126 | 40435 | jjdelcerro | /**
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127 | * Creates a new {@link Iterator}, begginning at the specified data index.
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128 | *
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129 | * @param index
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130 | * the first element position to be returned by the
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131 | * {@link Iterator}
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132 | * @return a new {@link Iterator}
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133 | * @throws DataException
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134 | * if there is an error creating the {@link Iterator}
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135 | */
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136 | protected abstract AbstractFeatureProviderIterator createIterator(long index) |
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137 | throws DataException;
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138 | |||
139 | 43358 | jjdelcerro | protected AbstractFeatureProviderIterator createIterator(long index, long elements) |
140 | throws DataException {
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141 | return createIterator(index);
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142 | } |
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143 | |||
144 | /**
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145 | 40435 | jjdelcerro | * Creates a new fast {@link Iterator}, begginning at the specified data
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146 | * index. By fast this means the object instances of data (
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147 | * {@link FeatureProvider}) may be reused between the
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148 | * {@link Iterator#next()} method invocations.
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149 | *
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150 | * @param index
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151 | * the first element position to be returned by the
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152 | * {@link Iterator}
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153 | * @return a new {@link Iterator}
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154 | * @throws DataException
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155 | * if there is an error creating the {@link Iterator}
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156 | */
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157 | protected abstract AbstractFeatureProviderIterator createFastIterator( |
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158 | long index) throws DataException; |
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159 | 43358 | jjdelcerro | |
160 | protected AbstractFeatureProviderIterator createFastIterator(
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161 | long index, long elements) throws DataException { |
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162 | return createFastIterator(index);
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163 | } |
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164 | 47198 | jjdelcerro | |
165 | @Override
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166 | public String toString() { |
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167 | try {
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168 | ToStringBuilder builder = new ToStringBuilder(this); |
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169 | builder.append("store", this.store, true); |
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170 | builder.append("query", this.query, true); |
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171 | return builder.toString();
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172 | } catch (Exception e) { |
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173 | return super.toString(); |
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174 | } |
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175 | } |
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176 | 40767 | jjdelcerro | } |