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 / ForeingValueFunction.java @ 44738
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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.Arrays; |
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27 | import java.util.List; |
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28 | import org.apache.commons.lang3.Range; |
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29 | import org.apache.commons.lang3.StringUtils; |
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30 | import org.gvsig.expressionevaluator.ExpressionBuilder; |
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31 | import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
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32 | import org.gvsig.expressionevaluator.ExpressionUtils; |
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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.expressionevaluator.spi.AbstractFunction; |
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36 | import org.gvsig.fmap.dal.DataManager; |
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37 | import org.gvsig.fmap.dal.feature.Feature; |
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38 | import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor; |
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39 | import org.gvsig.fmap.dal.feature.ForeingKey; |
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40 | import org.gvsig.tools.util.UnmodifiableBasicList; |
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41 | import org.gvsig.tools.util.UnmodifiableBasicListAdapter; |
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42 | |||
43 | public class ForeingValueFunction extends AbstractFunction { |
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44 | |||
45 | public ForeingValueFunction() {
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46 | super(
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47 | DALFunctions.GROUP_DATA_ACCESS, |
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48 | DALFunctions.FUNCTION_FOREING_VALUE, |
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49 | Range.is(1),
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50 | "Return the value of a field throw a relation from other tables.",
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51 | DALFunctions.FUNCTION_FOREING_VALUE + "({{field_name}})",
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52 | new String[]{ |
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53 | "fieldName - dot separated field path or list of strings with field names."
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54 | }, |
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55 | "OBJECT"
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56 | ); |
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57 | } |
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58 | |||
59 | private Feature current_row(Interpreter interpreter) {
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60 | try {
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61 | Feature f = (Feature) interpreter.call(DALFunctions.FUNCTION_CURRENT_ROW); |
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62 | return f;
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63 | } catch (Exception ex) { |
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64 | return null; |
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65 | } |
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66 | } |
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67 | |||
68 | @Override
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69 | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
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70 | ExpressionBuilder builder = ExpressionUtils.createExpressionBuilder(); |
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71 | UnmodifiableBasicList<String> fieldNames;
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72 | Object fields_o = getObject(args, 0); |
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73 | if (fields_o instanceof List) { |
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74 | fieldNames = new UnmodifiableBasicListAdapter<>((List<String>) fields_o); |
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75 | } else if (fields_o instanceof String) { |
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76 | fieldNames = new UnmodifiableBasicListAdapter<>(Arrays.asList(((String) fields_o).split("[.]"))); |
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77 | } else if (fields_o instanceof UnmodifiableBasicList) { |
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78 | fieldNames = (UnmodifiableBasicList<String>) fields_o;
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79 | } else {
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80 | throw new ExpressionRuntimeException("Problems calling '" + DataManager.FUNCTION_FOREING_VALUE + "' function, type of parameter '" + fields_o.getClass().getSimpleName() + "' not supported, use string or list."); |
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81 | } |
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82 | Feature feature = this.current_row(interpreter);
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83 | Feature currentFeature = feature; |
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84 | try {
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85 | String fieldName;
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86 | Object value;
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87 | value = feature.getExtraValue(StringUtils.join(fieldNames, "."));
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88 | if (value != null) { |
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89 | return value;
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90 | } |
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91 | for (int i = 0; i < fieldNames.size() - 1; i++) { |
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92 | fieldName = fieldNames.get(i); |
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93 | value = currentFeature.get(fieldName); |
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94 | FeatureAttributeDescriptor attrdesc = currentFeature.getType().getAttributeDescriptor(fieldName); |
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95 | ForeingKey foreingKey = attrdesc.getForeingKey(); |
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96 | // ContextForeingKey context = foreingKey.createContext();
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97 | currentFeature = foreingKey.getFeature(null, value);
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98 | // DisposeUtils.disposeQuietly(context);
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99 | if (currentFeature == null) { |
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100 | return null; |
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101 | } |
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102 | } |
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103 | fieldName = fieldNames.get(fieldNames.size() - 1);
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104 | value = currentFeature.get(fieldName); |
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105 | return value;
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106 | } catch (ExpressionRuntimeException ex) {
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107 | throw ex;
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108 | } catch (Exception ex) { |
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109 | throw new ExpressionRuntimeException("Problems calling '" + DataManager.FUNCTION_FOREING_VALUE + "' function", ex); |
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110 | } |
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111 | } |
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112 | |||
113 | } |