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    1   /*
    2    * $Id: StylesheetRenderer.java 471754 2006-11-06 14:55:09Z husted $
    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 javax.faces.component.UIComponent;
    28  import javax.faces.context.FacesContext;
    29  import javax.faces.context.ResponseWriter;
    30
    31  import org.apache.commons.logging.Log;
    32  import org.apache.commons.logging.LogFactory;
    33
    34
    35  /**
    36   * <p><code>Renderer</code> implementation for the <code>stylesheet</code> tag
    37   * from the <em>Struts-Faces Integration Library</em>.</p>
    38   *
    39   * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
    40   */
    41
    42  public class StylesheetRenderer extends AbstractRenderer {
    43
    44
    45      // -------------------------------------------------------- Static Variables
    46
    47
    48      /**
    49       * <p>The <code>Log</code> instance for this class.</p>
    50       */
    51      private static Log log = LogFactory.getLog(StylesheetRenderer.class);
    52
    53
    54      // ---------------------------------------------------------- Public Methods
    55
    56
    57      /**
    58       * <p>Render a relative HTML <code>&lt;link&gt;</code> element for a
    59       * <code>text/css</code> stylesheet at the specified context-relative
    60       * path.</p>
    61       *
    62       * @param context FacesContext for the request we are processing
    63       * @param component UIComponent to be rendered
    64       *
    65       * @exception IOException if an input/output error occurs while rendering
    66       * @exception NullPointerException if <code>context</code>
    67       *  or <code>component</code> is <code>null</code>
    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          ResponseWriter writer = context.getResponseWriter();
    77          writer.startElement("link", component);
    78          writer.writeAttribute("rel", "stylesheet", null);
    79          writer.writeAttribute("type", "text/css", null);
    80          writer.writeURIAttribute
    81              ("href",
    82               context.getExternalContext().getRequestContextPath() +
    83               (String) component.getAttributes().get("path"), "path");
    84          writer.endElement("link");
    85          writer.writeText("\n", null);
    86
    87      }
    88
    89
    90
    91      // ------------------------------------------------------- Protected Methods
    92
    93
    94  }