SqlParamTag


1   /*
2    * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3    *
4    * This file is part of Resin(R) Open Source
5    *
6    * Each copy or derived work must preserve the copyright notice and this
7    * notice unmodified.
8    *
9    * Resin Open Source is free software; you can redistribute it and/or modify
10   * it under the terms of the GNU General Public License as published by
11   * the Free Software Foundation; either version 2 of the License, or
12   * (at your option) any later version.
13   *
14   * Resin Open Source is distributed in the hope that it will be useful,
15   * but WITHOUT ANY WARRANTY; without even the implied warranty of
16   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17   * of NON-INFRINGEMENT.  See the GNU General Public License for more
18   * details.
19   *
20   * You should have received a copy of the GNU General Public License
21   * along with Resin Open Source; if not, write to the
22   *   Free SoftwareFoundation, Inc.
23   *   59 Temple Place, Suite 330
24   *   Boston, MA 02111-1307  USA
25   *
26   * @author Scott Ferguson
27   */
28  
29  package com.caucho.jstl.el;
30  
31  import com.caucho.el.Expr;
32  import com.caucho.jsp.PageContextImpl;
33  import com.caucho.jstl.ParamContainerTag;
34  import com.caucho.util.L10N;
35  
36  import javax.servlet.jsp.JspException  ;
37  import javax.servlet.jsp.jstl.sql.SQLExecutionTag;
38  import javax.servlet.jsp.tagext.BodyTagSupport  ;
39  import javax.servlet.jsp.tagext.Tag  ;
40  
41  /**
42   * Looks up an i18n message from a bundle and prints it.
43   */
44  public class SqlParamTag extends BodyTagSupport   {
45    private static L10N L = new L10N(SqlParamTag.class);
46    
47    private Expr _valueExpr;
48  
49    /**
50     * Sets the value
51     *
52     * @param value the JSP-EL expression for the value.
53     */
54    public void setValue(Expr value)
55    {
56      _valueExpr = value;
57    }
58  
59    /**
60     * Process the tag.
61     */
62    public int doStartTag()
63      throws JspException  
64    {
65      if (_valueExpr == null)
66        return EVAL_BODY_BUFFERED;
67  
68      PageContextImpl pageContext = (PageContextImpl) this.pageContext;
69      
70      Object   value = _valueExpr.evalObject(pageContext.getELContext());
71  
72      Tag parent = getParent();
73      for (;
74       parent != null && ! (parent instanceof SQLExecutionTag);
75       parent = parent.getParent()) {
76      }
77  
78      if (parent == null)
79        throw new JspException  (L.l("sql:param requires sql:query parent.")); 
80  
81      SQLExecutionTag tag = (SQLExecutionTag) parent;
82  
83      tag.addSQLParameter(value);
84      
85      return SKIP_BODY;
86    }
87  
88    /**
89     * Process the tag.
90     */
91    public int doEndTag()
92      throws JspException  
93    {
94      if (_valueExpr != null)
95        return EVAL_PAGE;
96        
97      String   value;
98  
99      if (bodyContent != null)
100       value = bodyContent.getString().trim();
101     else
102       value = "";
103 
104     Object   parent = getParent();
105     if (! (parent instanceof ParamContainerTag))
106       throw new JspException  (L.l("sql:param requires sql:query parent.")); 
107 
108     ParamContainerTag tag = (ParamContainerTag) parent;
109 
110     tag.addParam(value);
111     
112     return EVAL_PAGE;
113   }
114 }
115
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags