BlockUrlTag


1   /*
2    * Created on Oct 6, 2003
3    *
4    */
5   package org.jresearch.gossip.tags;
6   
7   import java.util.Enumeration  ;
8   
9   import javax.servlet.http.HttpServletRequest  ;
10  import javax.servlet.http.HttpServletResponse  ;
11  import javax.servlet.jsp.JspException  ;
12  import javax.servlet.jsp.JspWriter  ;
13  import javax.servlet.jsp.tagext.TagSupport  ;
14  
15  import org.jresearch.gossip.IConst;
16  import org.jresearch.gossip.list.RecordsData;
17  
18  /**
19   * DOCUMENT ME!
20   * 
21   * @author Bel
22   */
23  public class BlockUrlTag extends TagSupport   {
24  
25      private int block;
26  
27      private int increase;
28  
29      /**
30       * DOCUMENT ME!
31       * 
32       * @return DOCUMENT ME!
33       * 
34       * @throws JspException
35       *             DOCUMENT ME!
36       */
37      public int doStartTag() throws JspException   {
38          try {
39              HttpServletRequest   req = (HttpServletRequest  ) pageContext
40                      .getRequest();
41              HttpServletResponse   response = (HttpServletResponse  ) pageContext
42                      .getResponse();
43              Enumeration   pnames = req.getParameterNames();
44              StringBuffer   url = new StringBuffer  ((String  ) req
45                      .getAttribute(IConst.REQUEST.REQUEST_URI)
46                      + "?");
47  
48              this.block = ((RecordsData) req
49                      .getAttribute(IConst.REQUEST.RECORDS_DATA)).getCurrBlock();
50  
51              while (pnames.hasMoreElements()) {
52                  String   name = (String  ) pnames.nextElement();
53  
54                  if (req.getParameter(name) != null
55                          && !req.getParameter(name).equals("")) {
56                      url.append(name);
57                      url.append("=");
58  
59                      if (name.equals("block")) {
60                          url
61                                  .append(this.block
62                                          + (this.increase * ((RecordsData) req
63                                                  .getAttribute(IConst.REQUEST.RECORDS_DATA))
64                                                  .getBlockSize()));
65                      } else {
66                          url.append(req.getParameter(name));
67                      }
68  
69                      if (pnames.hasMoreElements()) {
70                          url.append("&");
71                      }
72  
73                  }
74              }
75  
76              if (req.getParameter("block") == null) {
77                  url.append("&block=");
78                  url.append(this.block
79                          + (this.increase * ((RecordsData) req
80                                  .getAttribute(IConst.REQUEST.RECORDS_DATA))
81                                  .getBlockSize()));
82              }
83  
84              JspWriter   out = pageContext.getOut();
85              out.print(response.encodeURL(url.toString()));
86          } catch (Exception   ex) {
87              throw new JspException  ("error in BlockUrlTag tag:", ex);
88          }
89  
90          return (SKIP_BODY);
91      }
92  
93      /**
94       * DOCUMENT ME!
95       * 
96       * @return
97       */
98      public int getBlock() {
99          return this.block;
100     }
101 
102     /**
103      * DOCUMENT ME!
104      * 
105      * @param i
106      */
107     public void setBlock(int i) {
108         this.block = i;
109     }
110 
111     /**
112      * DOCUMENT ME!
113      * 
114      * @return
115      */
116     public int getIncrease() {
117         return this.increase;
118     }
119 
120     /**
121      * DOCUMENT ME!
122      * 
123      * @param i
124      */
125     public void setIncrease(int i) {
126         this.increase = (i > 0) ? 1 : (-1);
127     }
128 }
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