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1   /*
2    * $Id: NestedFileTag.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  package org.apache.struts.taglib.nested.html;
22  
23  import org.apache.struts.taglib.html.FileTag;
24  import org.apache.struts.taglib.nested.NestedNameSupport;
25  import org.apache.struts.taglib.nested.NestedPropertyHelper;
26  
27  import javax.servlet.http.HttpServletRequest;
28  import javax.servlet.jsp.JspException;
29  
30  /**
31   * NestedFileTag.
32   *
33   * @version $Rev: 471754 $
34   * @since Struts 1.1
35   */
36  public class NestedFileTag extends FileTag implements NestedNameSupport {
37      /* the usual private member variables */
38      private String originalName = null;
39      private String originalProperty = null;
40  
41      /**
42       * Overriding method of the heart of the matter. Gets the relative
43       * property and leaves the rest up to the original tag implementation.
44       * Sweet.
45       *
46       * @return int JSP continuation directive. This is in the hands of the
47       *         super class.
48       */
49      public int doStartTag() throws JspException {
50          // get the original properties
51          originalName = getName();
52          originalProperty = getProperty();
53  
54          // request
55          HttpServletRequest request =
56              (HttpServletRequest) pageContext.getRequest();
57  
58          // set the properties
59          NestedPropertyHelper.setNestedProperties(request, this);
60  
61          // let the super do it's thing
62          return super.doStartTag();
63      }
64  
65      /**
66       * Complete the processing of the tag. The nested tags here will restore
67       * all the original value for the tag itself and the nesting context.
68       *
69       * @return int to describe the next step for the JSP processor
70       * @throws JspException for the bad things JSP's do
71       */
72      public int doEndTag() throws JspException {
73          // do the super's ending part
74          int i = super.doEndTag();
75  
76          // reset the properties
77          setName(originalName);
78          setProperty(originalProperty);
79  
80          // continue
81          return i;
82      }
83  
84      /**
85       * Release the tag's resources and reset the values.
86       */
87      public void release() {
88          super.release();
89  
90          // reset the originals
91          originalName = null;
92          originalProperty = null;
93      }
94  }