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: * Function.java
27: * ------------
28: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
29: */package org.jfree.report.function;
30:
31: import org.jfree.report.event.ReportListener;
32:
33: /**
34: * The interface for report functions. A report function separates the business logic
35: * from presentation of the result. The function is called whenever JFreeReport changes
36: * its state while generating the report. The working model for the functions is based on
37: * cloning the state of the function on certain checkpoints to support the ReportState
38: * implementation of JFreeReport.
39: * <p/>
40: * Although functions support the ReportListener interface, they are not directly added to
41: * a report. A report FunctionCollection is used to control the functions. Functions are
42: * required to be cloneable.
43: * <p/>
44: *
45: * @author Thomas Morgner
46: */
47: public interface Function extends ReportListener, Expression {
48: }
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