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Java > Open Source Codes > nextapp > echo2 > app > MutableStyleSheet


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.app;
31
32 import java.util.HashMap JavaDoc;
33 import java.util.Map JavaDoc;
34
35 //TODO: Potential add removeStyle(), iterator() methods.
36
37 /**
38  * A mutable implementation of a <code>StyleSheet</code>.
39  */
40 public class MutableStyleSheet
41 implements StyleSheet {
42
43     private Map JavaDoc namedStyleMap = new HashMap JavaDoc();
44     private Map JavaDoc defaultStyleMap = new HashMap JavaDoc();
45
46     /**
47      * Adds a <code>Style</code> to the <code>StyleSheet</code>.
48      *
49      * @param componentClass the <code>Class</code> of the
50      * <code>Component</code> for which the style is to be used
51      * @param styleName the name of the style
52      * @param style the <code>Style</code> to be added
53      */
54     public void addStyle(Class JavaDoc componentClass, String JavaDoc styleName, Style style) {
55         if (styleName == null) {
56             defaultStyleMap.put(componentClass, style);
57         } else {
58             Map JavaDoc styleMap = (Map JavaDoc) namedStyleMap.get(styleName);
59             if (styleMap == null) {
60                 styleMap = new HashMap JavaDoc();
61                 namedStyleMap.put(styleName, styleMap);
62             }
63             styleMap.put(componentClass, style);
64         }
65     }
66     
67     /**
68      * Adds the contents of another <code>StyleSheet</code> to this
69      * <code>StyleSheet</code>. Future changes to the added
70      * <code>StyleSheet</code> will not be reflected, unless it is re-added.
71      *
72      * @param styleSheet the <code>StyleSheet</code> to add
73      */
74     public void addStyleSheet(MutableStyleSheet styleSheet) {
75         namedStyleMap.putAll(styleSheet.namedStyleMap);
76         defaultStyleMap.putAll(styleSheet.defaultStyleMap);
77     }
78     
79     /**
80      * @see nextapp.echo2.app.StyleSheet#getStyle(java.lang.Class, java.lang.String)
81      */
82     public Style getStyle(Class JavaDoc componentClass, String JavaDoc styleName) {
83         if (styleName == null) {
84             // Retrieve generic style.
85 while (componentClass != Object JavaDoc.class) {
86                 Style style = (Style) defaultStyleMap.get(componentClass);
87                 if (style != null) {
88                     return style;
89                 }
90                 componentClass = componentClass.getSuperclass();
91             }
92             return null;
93         } else {
94             // Retrieve named style.
95 Map JavaDoc styleMap = (Map JavaDoc) namedStyleMap.get(styleName);
96             if (styleMap == null) {
97                  return null;
98             }
99             while (componentClass != Object JavaDoc.class) {
100                 Style style = (Style) styleMap.get(componentClass);
101                 if (style != null) {
102                     return style;
103                 }
104                 componentClass = componentClass.getSuperclass();
105             }
106             return null;
107         }
108     }
109 }
110
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