AbstractStylableDocument


1   /*
2   
3      Copyright 2004 The Apache Software Foundation 
4   
5      Licensed under the Apache License, Version 2.0 (the "License");
6      you may not use this file except in compliance with the License.
7      You may obtain a copy of the License at
8   
9          http://www.apache.org/licenses/LICENSE-2.0
10  
11     Unless required by applicable law or agreed to in writing, software
12     distributed under the License is distributed on an "AS IS" BASIS,
13     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14     See the License for the specific language governing permissions and
15     limitations under the License.
16  
17  */
18  
19  package org.apache.batik.dom;
20  
21  import org.apache.batik.css.engine.CSSEngine;
22  
23  import org.w3c.dom.css.DocumentCSS;
24  import org.w3c.dom.css.CSSStyleDeclaration;
25  import org.w3c.dom.DocumentType  ;
26  import org.w3c.dom.DOMImplementation  ;
27  import org.w3c.dom.Element  ;
28  import org.w3c.dom.stylesheets.StyleSheetList;
29  import org.w3c.dom.views.DocumentView;
30  import org.w3c.dom.views.AbstractView;
31  
32  /**
33   * A Document that supports CSS styling.
34   *
35   * @author <a HREF="mailto:deweese@apache.org">deweese</a>
36   * @version $Id: AbstractStylableDocument.java,v 1.2 2005/03/27 08:58:32 cam Exp $
37   */
38  public abstract class AbstractStylableDocument extends AbstractDocument
39      implements DocumentCSS,
40                 DocumentView {
41  
42      /**
43       * The default view.
44       */
45      protected transient AbstractView defaultView;
46  
47      /**
48       * The CSS engine.
49       */
50      protected transient CSSEngine cssEngine;
51  
52  
53      protected AbstractStylableDocument() {
54      }
55  
56      /**
57       * Creates a new document.
58       */
59      protected AbstractStylableDocument(DocumentType   dt, 
60                                         DOMImplementation   impl) {
61          super(dt, impl);
62      }
63  
64      /**
65       * Sets the CSS engine.
66       */
67      public void setCSSEngine(CSSEngine ctx) {
68          cssEngine = ctx;
69      }
70  
71      /**
72       * Returns the CSS engine.
73       */
74      public CSSEngine getCSSEngine() {
75          return cssEngine;
76      }
77  
78      // DocumentStyle /////////////////////////////////////////////////////////
79  
80      /**
81       * <b>DOM</b>: Implements {@link
82       * org.w3c.dom.stylesheets.DocumentStyle#getStyleSheets()}.
83       */
84      public StyleSheetList getStyleSheets() {
85          throw new RuntimeException  (" !!! Not implemented");
86      }
87  
88      // DocumentView ///////////////////////////////////////////////////////////
89  
90      /**
91       * <b>DOM</b>: Implements {@link DocumentView#getDefaultView()}.
92       * @return a ViewCSS object.
93       */
94      public AbstractView getDefaultView() {
95          if (defaultView == null) {
96              ExtensibleDOMImplementation impl;
97              impl = (ExtensibleDOMImplementation)implementation;
98              defaultView = impl.createViewCSS(this);
99          }
100         return defaultView;
101     }
102 
103     /**
104      * Clears the view CSS.
105      */
106     public void clearViewCSS() {
107         defaultView = null;
108         if (cssEngine != null) {
109             cssEngine.dispose();
110         }
111         cssEngine = null;
112     }
113 
114     // DocumentCSS ////////////////////////////////////////////////////////////
115 
116     /**
117      * <b>DOM</b>: Implements
118      * {@link DocumentCSS#getOverrideStyle(Element,String)}.
119      */
120     public CSSStyleDeclaration getOverrideStyle(Element   elt,
121                                                 String   pseudoElt) {
122         throw new RuntimeException  (" !!! Not implemented");
123     }
124 
125 };
126
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