01: /**
02: * ===========================================
03: * JFreeReport : a free Java reporting library
04: * ===========================================
05: *
06: * Project Info: http://reporting.pentaho.org/
07: *
08: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
09: *
10: * This library is free software; you can redistribute it and/or modify it under the terms
11: * of the GNU Lesser General Public License as published by the Free Software Foundation;
12: * either version 2.1 of the License, or (at your option) any later version.
13: *
14: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16: * See the GNU Lesser General Public License for more details.
17: *
18: * You should have received a copy of the GNU Lesser General Public License along with this
19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20: * Boston, MA 02111-1307, USA.
21: *
22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
23: * in the United States and other countries.]
24: *
25: * ------------
26: * IsNegativeExpression.java
27: * ------------
28: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
29: */package org.jfree.report.function.numeric;
30:
31: import org.jfree.report.function.AbstractExpression;
32:
33: /**
34: * Checks, whether the column specified by the field name contains a negative number.
35: *
36: * @author Thomas Morgner
37: */
38: public class IsNegativeExpression extends AbstractExpression {
39: /**
40: * The field name.
41: */
42: private String field;
43:
44: /**
45: * Default constructor.
46: */
47: public IsNegativeExpression() {
48: }
49:
50: /**
51: * Checks, whether the column specified by the field name contains a negative number. Non-numeric values are not
52: * compared and result in Boolean.FALSE.
53: *
54: * @return the value of the function.
55: */
56: public Object getValue() {
57: final Object o = getDataRow().get(getField());
58: if (o instanceof Number == false) {
59: return Boolean.FALSE;
60: }
61: final Number n = (Number) o;
62: if (n.doubleValue() < 0) {
63: return Boolean.TRUE;
64: }
65: return Boolean.FALSE;
66: }
67:
68: /**
69: * Returns the name of the field from where to read the number.
70: *
71: * @return the field.
72: */
73: public String getField() {
74: return field;
75: }
76:
77: /**
78: * Defines the name of the field from where to read the number.
79: *
80: * @param field the field.
81: */
82: public void setField(final String field) {
83: this.field = field;
84: }
85: }
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