Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
MacroAdapter |
|
| 2.0;2 |
1 | /* | |
2 | * Copyright (C) 1998-2000 Semiotek Inc. All Rights Reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted under the terms of either of the following | |
6 | * Open Source licenses: | |
7 | * | |
8 | * The GNU General Public License, version 2, or any later version, as | |
9 | * published by the Free Software Foundation | |
10 | * (http://www.fsf.org/copyleft/gpl.html); | |
11 | * | |
12 | * or | |
13 | * | |
14 | * The Semiotek Public License (http://webmacro.org/LICENSE.) | |
15 | * | |
16 | * This software is provided "as is", with NO WARRANTY, not even the | |
17 | * implied warranties of fitness to purpose, or merchantability. You | |
18 | * assume all risks and liabilities associated with its use. | |
19 | * | |
20 | * See www.webmacro.org for more information on the WebMacro project. | |
21 | */ | |
22 | ||
23 | package org.webmacro.engine; | |
24 | ||
25 | import java.io.IOException; | |
26 | ||
27 | import org.webmacro.Context; | |
28 | import org.webmacro.FastWriter; | |
29 | import org.webmacro.Macro; | |
30 | import org.webmacro.TemplateVisitor; | |
31 | import org.webmacro.Visitable; | |
32 | ||
33 | /** | |
34 | * Looks like a Macro, but really it's not. Wrap any object as | |
35 | * a Macro via the createMacro method. You can use this when you | |
36 | * have to return a Macro, but what you have is something else. | |
37 | */ | |
38 | final public class MacroAdapter implements Macro, Visitable | |
39 | { | |
40 | ||
41 | private Object _self; | |
42 | ||
43 | private MacroAdapter (Object wrapMe) | |
44 | throws BuildException | |
45 | 0 | { |
46 | 0 | _self = wrapMe; |
47 | 0 | if (_self == null) |
48 | { | |
49 | 0 | throw new BuildException("MacroAdapter cannot wrap null"); |
50 | } | |
51 | 0 | } |
52 | ||
53 | public final String toString () | |
54 | { | |
55 | 0 | return _self.toString(); |
56 | } | |
57 | ||
58 | /** | |
59 | * Returns the wrapped object, context is ignored. | |
60 | */ | |
61 | public final Object evaluate (Context context) | |
62 | { | |
63 | 0 | return _self; |
64 | } | |
65 | ||
66 | /** | |
67 | * Just calls toString() and writes that, context is ignored. | |
68 | */ | |
69 | public final void write (FastWriter out, Context context) | |
70 | throws IOException | |
71 | { | |
72 | 0 | out.write(_self.toString()); |
73 | 0 | } |
74 | ||
75 | public void accept (TemplateVisitor v) | |
76 | { | |
77 | 0 | v.visitString(_self.toString()); |
78 | 0 | } |
79 | ||
80 | /** | |
81 | * If wrapMe is not a Macro, wrap it and return it. If it | |
82 | * is a Macro already, just return it. | |
83 | */ | |
84 | public final static Macro createMacro (Object wrapMe) | |
85 | throws BuildException | |
86 | { | |
87 | 0 | if (wrapMe == null) |
88 | { | |
89 | 0 | throw new BuildException("Bug in WM: attempt to write null"); |
90 | } | |
91 | 0 | if (wrapMe instanceof Macro) |
92 | { | |
93 | 0 | return (Macro) wrapMe; |
94 | } | |
95 | else | |
96 | { | |
97 | 0 | return new MacroAdapter(wrapMe); |
98 | } | |
99 | } | |
100 | ||
101 | } | |
102 |