1 ////////////////////////////////////////////////////////////////////////////////
2 // MillScript: an Open Spice interpreter and batch website creation tool
3 // Copyright (C) 2006 Open World Ltd, Kevin Rogers
4 //
5 // This file is part of MillScript.
6 //
7 // MillScript is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU General Public License as published by the Free
9 // Software Foundation; either version 2 of the License, or (at your option)
10 // any later version.
11 //
12 // MillScript is distributed in the hope that it will be useful, but WITHOUT
13 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 // more details.
16 //
17 // You should have received a copy of the GNU General Public License along with
18 // MillScript; if not, write to the Free Software Foundation, Inc., 59 Temple
19 // Place, Suite 330, Boston, MA 02111-1307 USA
20 ////////////////////////////////////////////////////////////////////////////////
21 package org.millscript.office.spreadsheet.formula.action;
22
23 import org.millscript.millscript.action.Action;
24 import org.millscript.millscript.action.UnaryOpAction;
25 import org.millscript.millscript.alert.Alerts;
26 import org.millscript.millscript.datatypes.Deferred;
27
28 /**
29 *
30 */
31 public class AsNumberAction extends UnaryOpAction {
32
33 public static final Number toNumber( final Object x ) {
34 try {
35 if ( x == null ) {
36 return Integer.valueOf( 0 );
37 } else {
38 return (Number)x;
39 }
40 } catch ( ClassCastException ex ) {
41 try {
42 return toNumber( ((Deferred< ? >) x).get() );
43 } catch ( ClassCastException ex2 ) {
44 throw Alerts.eval( "Number needed", null ).culprit( "object", x ).mishap();
45 }
46 }
47 }
48
49 /**
50 * Creates a new NullIsZero action to transform the result of the specified
51 * action into zero if its result is <code>null</code>.
52 *
53 * @param a the action whose result to transform to zero if it is
54 * <code>null</code>
55 */
56 public AsNumberAction( final Action a ) {
57 super( a );
58 }
59
60 /**
61 * @see org.millscript.millscript.action.UnaryOpAction#perform(java.lang.Object)
62 */
63 @Override
64 public Object perform( final Object x ) {
65 return toNumber( x );
66 }
67
68 }