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Java > Open Source Codes > org > apache > fop > fo > expr > PPColWidthFunction


1 /*
2  * $Id: PPColWidthFunction.java,v 1.2.2.1 2003/02/25 12:56:58 jeremias Exp $
3  * ============================================================================
4  * The Apache Software License, Version 1.1
5  * ============================================================================
6  *
7  * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without modifica-
10  * tion, are permitted provided that the following conditions are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
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19  * 3. The end-user documentation included with the redistribution, if any, must
20  * include the following acknowledgment: "This product includes software
21  * developed by the Apache Software Foundation (http://www.apache.org/)."
22  * Alternately, this acknowledgment may appear in the software itself, if
23  * and wherever such third-party acknowledgments normally appear.
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25  * 4. The names "FOP" and "Apache Software Foundation" must not be used to
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30  * 5. Products derived from this software may not be called "Apache", nor may
31  * "Apache" appear in their name, without prior written permission of the
32  * Apache Software Foundation.
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34  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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44  * ============================================================================
45  *
46  * This software consists of voluntary contributions made by many individuals
47  * on behalf of the Apache Software Foundation and was originally created by
48  * James Tauber <jtauber@jtauber.com>. For more information on the Apache
49  * Software Foundation, please see <http://www.apache.org/>.
50  */
51 package org.apache.fop.fo.expr;
52
53
54 import org.apache.fop.fo.Property;
55 import org.apache.fop.fo.LengthProperty;
56 import org.apache.fop.datatypes.TableColLength;
57
58 public class PPColWidthFunction extends FunctionBase {
59
60     public int nbArgs() {
61         return 1;
62     }
63
64     public Property eval(Property[] args,
65                          PropertyInfo pInfo) throws PropertyException {
66         Number JavaDoc d = args[0].getNumber();
67         if (d == null) {
68             throw new PropertyException("Non number operand to proportional-column-width function");
69         }
70         if (!pInfo.getPropertyList().getElement().equals("table-column")) {
71             throw new PropertyException("proportional-column-width function may only be used on table-column FO");
72         }
73         // Check if table-layout is "fixed"...
74 return new LengthProperty(new TableColLength(d.doubleValue()));
75     }
76
77 }
78
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