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1   /*
2    * $Id: JspWriterResponse.java 736275 2009-01-21 09:58:20Z apetrelli $
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  package org.apache.tiles.jsp.context;
22  
23  import javax.servlet.http.HttpServletResponseWrapper;
24  import javax.servlet.http.HttpServletResponse;
25  import javax.servlet.jsp.PageContext;
26  import java.io.PrintWriter;
27  import java.io.IOException;
28  
29  
30  /***
31   * It works as an {@link HttpServletResponse} by wrapping a
32   * {@link javax.servlet.jsp.JspWriter} around a {@link PrintWriter}.
33   *
34   * @version $Rev: 736275 $ $Date: 2009-01-21 10:58:20 +0100 (mer, 21 gen 2009) $
35   */
36  public class JspWriterResponse extends HttpServletResponseWrapper {
37  
38      /***
39       * The page context to use.
40       */
41      private PageContext context;
42  
43      /***
44       * The created print writer.
45       */
46      private PrintWriter writer;
47  
48      /***
49       * Constructor.
50       *
51       * @param pageContext The page context to use.
52       */
53      public JspWriterResponse(PageContext pageContext) {
54          super((HttpServletResponse) pageContext.getResponse());
55          this.context = pageContext;
56      }
57  
58  
59      /*** {@inheritDoc} */
60      public PrintWriter getWriter() throws IOException {
61          if (writer == null) {
62              writer = new JspPrintWriterAdapter(context.getOut());
63          }
64          return writer;
65      }
66  }