root / trunk / extensions / extSymbology / src / org / gvsig / symbology / fmap / rendering / filter / operations / MinusOperator.java @ 31408
History | View | Annotate | Download (3.76 KB)
1 |
/* gvSIG. Sistema de Informaci�n Geogr�fica de la Generalitat Valenciana
|
---|---|
2 |
*
|
3 |
* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
|
4 |
*
|
5 |
* This program is free software; you can redistribute it and/or
|
6 |
* modify it under the terms of the GNU General Public License
|
7 |
* as published by the Free Software Foundation; either version 2
|
8 |
* of the License, or (at your option) any later version.
|
9 |
*
|
10 |
* This program is distributed in the hope that it will be useful,
|
11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
13 |
* GNU General Public License for more details.
|
14 |
*
|
15 |
* You should have received a copy of the GNU General Public License
|
16 |
* along with this program; if not, write to the Free Software
|
17 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
|
18 |
*
|
19 |
* For more information, contact:
|
20 |
*
|
21 |
* Generalitat Valenciana
|
22 |
* Conselleria d'Infraestructures i Transport
|
23 |
* Av. Blasco Ib��ez, 50
|
24 |
* 46010 VALENCIA
|
25 |
* SPAIN
|
26 |
*
|
27 |
* +34 963862235
|
28 |
* gvsig@gva.es
|
29 |
* www.gvsig.gva.es
|
30 |
*
|
31 |
* or
|
32 |
*
|
33 |
* IVER T.I. S.A
|
34 |
* Salamanca 50
|
35 |
* 46005 Valencia
|
36 |
* Spain
|
37 |
*
|
38 |
* +34 963163400
|
39 |
* dac@iver.es
|
40 |
*/
|
41 |
package org.gvsig.symbology.fmap.rendering.filter.operations; |
42 |
|
43 |
import java.util.ArrayList; |
44 |
import java.util.Hashtable; |
45 |
|
46 |
import com.hardcode.gdbms.engine.values.Value; |
47 |
import com.iver.cit.gvsig.fmap.Messages; |
48 |
|
49 |
|
50 |
/**
|
51 |
* Implements the funcionality of the minus operator
|
52 |
*
|
53 |
* @author Pepe Vidal Salvador - jose.vidal.salvador@iver.es
|
54 |
*
|
55 |
*/
|
56 |
|
57 |
public class MinusOperator extends Operator { |
58 |
|
59 |
|
60 |
|
61 |
private ArrayList<Expression> arguments = new ArrayList<Expression>(); |
62 |
|
63 |
public String getName() { |
64 |
return OperationTags.MINUS_OP;
|
65 |
} |
66 |
|
67 |
|
68 |
public MinusOperator(Hashtable<String, Value> symbol_table) { |
69 |
super(symbol_table);
|
70 |
} |
71 |
|
72 |
public Object evaluate()throws ExpressionException { |
73 |
|
74 |
Double doubleResult = null; |
75 |
Integer intResult = null; |
76 |
|
77 |
|
78 |
try {
|
79 |
|
80 |
intResult = (Integer)((Expression)arguments.get(0)).evaluate(); |
81 |
if (intResult == null){ |
82 |
intResult=new Integer(0); |
83 |
} |
84 |
if (arguments.size() == 1) |
85 |
return -1*intResult; |
86 |
|
87 |
for (int i = 1; i < arguments.size(); i++){ |
88 |
Expression function = (Expression)arguments.get(i); |
89 |
Integer eval=((Integer)function.evaluate()); |
90 |
if (eval==null) |
91 |
eval=new Integer(0); |
92 |
intResult -= eval; |
93 |
} |
94 |
|
95 |
return intResult;
|
96 |
|
97 |
|
98 |
} catch (ClassCastException e) { |
99 |
|
100 |
doubleResult = new Double(((Expression)arguments.get(0)).evaluate().toString()); |
101 |
if (doubleResult == null){ |
102 |
doubleResult=new Double(0); |
103 |
} |
104 |
if(arguments.size() == 1) |
105 |
return -1*doubleResult; |
106 |
for (int i = 1; i < arguments.size(); i++){ |
107 |
Expression function = (Expression)arguments.get(i); |
108 |
Double eval=(Double)((Expression)function).evaluate(); |
109 |
if (eval==null) |
110 |
eval=new Double(0); |
111 |
doubleResult -= new Double(eval.toString()); |
112 |
} |
113 |
|
114 |
return doubleResult;
|
115 |
} |
116 |
|
117 |
} |
118 |
|
119 |
public void addArgument(int i, Expression arg) { |
120 |
arguments.add(i, arg); |
121 |
} |
122 |
|
123 |
|
124 |
public String getPattern() { |
125 |
return "("+Messages.getString(OperationTags.OPERAND) |
126 |
+ OperationTags.MINUS_OP +Messages.getString(OperationTags.OPERAND)+ ")\n"+
|
127 |
Messages.getString(OperationTags.OPERAND) +" = "+
|
128 |
Messages.getString(OperationTags.NUMERIC_VALUE ); |
129 |
} |
130 |
|
131 |
public ArrayList<Expression> getArguments() { |
132 |
return arguments;
|
133 |
} |
134 |
|
135 |
public void setArguments(ArrayList<Expression> arguments) { |
136 |
this.arguments = arguments;
|
137 |
} |
138 |
|
139 |
public void check() throws ExpressionException { |
140 |
|
141 |
for (int i = 0; i < arguments.size(); i++) { |
142 |
if(!(arguments.get(i)instanceof NumericalConstant)) |
143 |
throw new ExpressionException(ExpressionException.CLASS_CASTING_EXCEPTION); |
144 |
} |
145 |
} |
146 |
|
147 |
} |