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