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1   /*
2    * Copyright 2002,2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.struts.faces.renderer;
18  
19  
20  import java.io.IOException;
21  
22  import javax.faces.component.UIComponent;
23  import javax.faces.context.FacesContext;
24  import javax.faces.context.ResponseWriter;
25  
26  import org.apache.commons.logging.Log;
27  import org.apache.commons.logging.LogFactory;
28  
29  
30  /***
31   * <p><code>Renderer</code> implementation for the <code>stylesheet</code> tag
32   * from the <em>Struts-Faces Integration Library</em>.</p>
33   *
34   * @version $Rev: 421138 $ $Date: 2006-07-11 22:41:40 -0700 (Tue, 11 Jul 2006) $
35   */
36  
37  public class StylesheetRenderer extends AbstractRenderer {
38  
39  
40      // -------------------------------------------------------- Static Variables
41  
42  
43      /***
44       * <p>The <code>Log</code> instance for this class.</p>
45       */
46      private static Log log = LogFactory.getLog(StylesheetRenderer.class);
47  
48  
49      // ---------------------------------------------------------- Public Methods
50  
51  
52      /***
53       * <p>Render a relative HTML <code>&lt;link&gt;</code> element for a
54       * <code>text/css</code> stylesheet at the specified context-relative
55       * path.</p>
56       *
57       * @param context FacesContext for the request we are processing
58       * @param component UIComponent to be rendered
59       *
60       * @exception IOException if an input/output error occurs while rendering
61       * @exception NullPointerException if <code>context</code>
62       *  or <code>component</code> is <code>null</code>
63       */
64      public void encodeEnd(FacesContext context, UIComponent component)
65          throws IOException {
66  
67          if ((context == null) || (component == null)) {
68              throw new NullPointerException();
69          }
70  
71          ResponseWriter writer = context.getResponseWriter();
72          writer.startElement("link", component);
73          writer.writeAttribute("rel", "stylesheet", null);
74          writer.writeAttribute("type", "text/css", null);
75          writer.writeURIAttribute
76              ("href",
77               context.getExternalContext().getRequestContextPath() +
78               (String) component.getAttributes().get("path"), "path");
79          writer.endElement("link");
80          writer.writeText("\n", null);
81  
82      }
83  
84  
85  
86      // ------------------------------------------------------- Protected Methods
87  
88  
89  }