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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 org.apache.struts.faces.util.StrutsContext;
28  import org.apache.struts.faces.util.Utils;
29  import org.slf4j.Logger;
30  import org.slf4j.LoggerFactory;
31  
32  import jakarta.faces.component.UIComponent;
33  import jakarta.faces.context.FacesContext;
34  import jakarta.faces.context.ResponseWriter;
35  
36  
37  /**
38   * {@code Renderer} implementation for the {@code base} tag
39   * from the <em>Struts-Faces Integration Library</em>.
40   *
41   * @version $Rev$ $Date$
42   */
43  public class BaseRenderer extends AbstractRenderer {
44  
45  
46      // -------------------------------------------------------- Static Variables
47  
48  
49      /**
50       * The {@code Log} instance for this class.
51       */
52      private final Logger log =
53          LoggerFactory.getLogger(BaseRenderer.class);
54  
55  
56      // ---------------------------------------------------------- Public Methods
57  
58  
59      /**
60       * Render an HTML {@code base} element.
61       *
62       * @param context {@code FacesContext} for the request we are processing
63       * @param component {@code UIComponent} to be rendered
64       *
65       * @throws IOException if an input/output error occurs while rendering
66       * @throws NullPointerException if {@code context} or {@code component}
67       *     is null
68       */
69      public void encodeEnd(FacesContext context, UIComponent component)
70          throws IOException {
71  
72          if (context == null || component == null) {
73              throw new NullPointerException();
74          }
75  
76          final String uri = StrutsContext.uri(context);
77  
78          log.trace("viewId='{}' --> uri='{}'",
79              context.getViewRoot().getViewId(), uri);
80  
81          ResponseWriter writer = context.getResponseWriter();
82          writer.startElement("base", component);
83          writer.writeURIAttribute("href", uri, null);
84          String target = Utils.getMapValue(String.class, component.getAttributes(), "target");
85          if (target != null) {
86              writer.writeAttribute("target", target, "target");
87          }
88          writer.endElement("base");
89          writer.writeText("\n", null);
90  
91      }
92  }