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: * CompareFieldsExpression.java
27: * ------------
28: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
29: */package org.jfree.report.function;
30:
31: /**
32: * Compares the values of two fields.
33: *
34: * @author Thomas Morgner
35: */
36: public class CompareFieldsExpression extends AbstractCompareExpression {
37: /**
38: * The name of the data-row column that holds the second value.
39: */
40: private String otherField;
41:
42: /**
43: * Default Constructor.
44: */
45: public CompareFieldsExpression() {
46: }
47:
48: /**
49: * Returns the name of the data-row column that holds the second value.
50: *
51: * @return the name of the other field.
52: */
53: public String getOtherField() {
54: return otherField;
55: }
56:
57: /**
58: * Defines the name of the data-row column that holds the second value.
59: *
60: * @param otherField the name of the other field.
61: */
62: public void setOtherField(final String otherField) {
63: this .otherField = otherField;
64: }
65:
66: /**
67: * Returns the value of the other field. If the value is no comparable, this method returns <code>null</code>
68: * instead.
69: *
70: * @return the value of the other field.
71: */
72: protected Comparable getComparable() {
73: final Object o = getDataRow().get(getOtherField());
74: if (o instanceof Comparable) {
75: return (Comparable) o;
76: }
77: return null;
78: }
79: }
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