root / trunk / extensions / extSymbology / src / org / gvsig / symbology / fmap / rendering / filter / operations / MinusOperator.java @ 31408
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1 | 20768 | jdominguez | /* gvSIG. Sistema de Informaci�n Geogr�fica de la Generalitat Valenciana
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2 | *
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3 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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4 | *
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5 | * This program is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU General Public License
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7 | * as published by the Free Software Foundation; either version 2
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8 | * of the License, or (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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18 | *
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19 | * For more information, contact:
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20 | *
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21 | * Generalitat Valenciana
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22 | * Conselleria d'Infraestructures i Transport
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23 | * Av. Blasco Ib��ez, 50
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24 | * 46010 VALENCIA
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25 | * SPAIN
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26 | *
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27 | * +34 963862235
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28 | * gvsig@gva.es
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29 | * www.gvsig.gva.es
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30 | *
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31 | * or
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32 | *
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33 | * IVER T.I. S.A
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34 | * Salamanca 50
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35 | * 46005 Valencia
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36 | * Spain
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37 | *
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38 | * +34 963163400
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39 | * dac@iver.es
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40 | */
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41 | package org.gvsig.symbology.fmap.rendering.filter.operations; |
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42 | |||
43 | import java.util.ArrayList; |
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44 | import java.util.Hashtable; |
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45 | |||
46 | import com.hardcode.gdbms.engine.values.Value; |
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47 | 20792 | vcaballero | import com.iver.cit.gvsig.fmap.Messages; |
48 | 20768 | jdominguez | |
49 | |||
50 | /**
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51 | * Implements the funcionality of the minus operator
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52 | 22512 | jvidal | *
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53 | 20768 | jdominguez | * @author Pepe Vidal Salvador - jose.vidal.salvador@iver.es
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54 | *
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55 | */
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56 | |||
57 | 22512 | jvidal | public class MinusOperator extends Operator { |
58 | 22187 | jdominguez | |
59 | 22512 | jvidal | |
60 | |||
61 | 22187 | jdominguez | private ArrayList<Expression> arguments = new ArrayList<Expression>(); |
62 | |||
63 | public String getName() { |
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64 | return OperationTags.MINUS_OP;
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65 | } |
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66 | 22512 | jvidal | |
67 | |||
68 | public MinusOperator(Hashtable<String, Value> symbol_table) { |
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69 | super(symbol_table);
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70 | } |
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71 | |||
72 | public Object evaluate()throws ExpressionException { |
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73 | |||
74 | 22187 | jdominguez | Double doubleResult = null; |
75 | Integer intResult = null; |
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76 | 20768 | jdominguez | |
77 | |||
78 | 22187 | jdominguez | try {
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79 | |||
80 | 22512 | jvidal | intResult = (Integer)((Expression)arguments.get(0)).evaluate(); |
81 | 31408 | vcaballero | if (intResult == null){ |
82 | intResult=new Integer(0); |
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83 | } |
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84 | 22187 | jdominguez | if (arguments.size() == 1) |
85 | return -1*intResult; |
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86 | |||
87 | for (int i = 1; i < arguments.size(); i++){ |
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88 | Expression function = (Expression)arguments.get(i); |
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89 | 31408 | vcaballero | Integer eval=((Integer)function.evaluate()); |
90 | if (eval==null) |
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91 | eval=new Integer(0); |
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92 | intResult -= eval; |
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93 | 22187 | jdominguez | } |
94 | |||
95 | return intResult;
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96 | |||
97 | 22512 | jvidal | |
98 | 22187 | jdominguez | } catch (ClassCastException e) { |
99 | 22512 | jvidal | |
100 | doubleResult = new Double(((Expression)arguments.get(0)).evaluate().toString()); |
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101 | 31408 | vcaballero | if (doubleResult == null){ |
102 | doubleResult=new Double(0); |
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103 | } |
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104 | 22187 | jdominguez | if(arguments.size() == 1) |
105 | return -1*doubleResult; |
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106 | for (int i = 1; i < arguments.size(); i++){ |
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107 | Expression function = (Expression)arguments.get(i); |
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108 | 31408 | vcaballero | Double eval=(Double)((Expression)function).evaluate(); |
109 | if (eval==null) |
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110 | eval=new Double(0); |
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111 | doubleResult -= new Double(eval.toString()); |
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112 | 22187 | jdominguez | } |
113 | |||
114 | return doubleResult;
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115 | 20768 | jdominguez | } |
116 | 22187 | jdominguez | |
117 | 20768 | jdominguez | } |
118 | 22187 | jdominguez | |
119 | 20768 | jdominguez | public void addArgument(int i, Expression arg) { |
120 | 22512 | jvidal | arguments.add(i, arg); |
121 | 20768 | jdominguez | } |
122 | |||
123 | |||
124 | public String getPattern() { |
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125 | 22187 | jdominguez | return "("+Messages.getString(OperationTags.OPERAND) |
126 | 22512 | jvidal | + OperationTags.MINUS_OP +Messages.getString(OperationTags.OPERAND)+ ")\n"+
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127 | 22187 | jdominguez | Messages.getString(OperationTags.OPERAND) +" = "+
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128 | 22512 | jvidal | Messages.getString(OperationTags.NUMERIC_VALUE ); |
129 | 22187 | jdominguez | } |
130 | |||
131 | 20768 | jdominguez | public ArrayList<Expression> getArguments() { |
132 | return arguments;
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133 | } |
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134 | |||
135 | public void setArguments(ArrayList<Expression> arguments) { |
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136 | this.arguments = arguments;
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137 | } |
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138 | |||
139 | 22512 | jvidal | public void check() throws ExpressionException { |
140 | 22187 | jdominguez | |
141 | 20768 | jdominguez | for (int i = 0; i < arguments.size(); i++) { |
142 | 22187 | jdominguez | if(!(arguments.get(i)instanceof NumericalConstant)) |
143 | 22512 | jvidal | throw new ExpressionException(ExpressionException.CLASS_CASTING_EXCEPTION); |
144 | 20768 | jdominguez | } |
145 | } |
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146 | |||
147 | } |