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1
21 package net.mlw.vlh.web.tag.support;
22
23 import java.util.ArrayList  ;
24 import java.util.HashMap ;
25 import java.util.Iterator ;
26 import java.util.List ;
27 import java.util.Map ;
28
29 import javax.servlet.jsp.PageContext ;
30
31
36 public class GroupingCellInterceptor implements CellInterceptor
37 {
38
41 public boolean isHidden(PageContext pageContext, String key, String name,
42 Object value)
43 {
44 if( key == null )
45 {
46 return false;
47 }
48
49 GroupingInfo info = (GroupingInfo)pageContext.getAttribute(key + "GroupingInfo");
50 if( info == null )
51 {
52 pageContext.setAttribute(key + "GroupingInfo", info = new GroupingInfo());
53 }
54
55 return info.sameAsLastValue(name, value);
56 }
57
58 private static class GroupingInfo
59 {
60 private List names = new ArrayList ();
61 private Map lastValues = new HashMap ();
62
63 public boolean sameAsLastValue(String name, Object value)
64 {
65 if(!names.contains(name))
66 {
67 names.add(name);
68 lastValues.put(name, value);
69 return false;
70 }
71
72 Object lastValue = lastValues.get(name);
73 lastValues.put(name, value);
74
75 if(lastValue==null)
76 {
77 return false;
78 }
79 else
80 {
81 if(lastValue.equals(value))
82 {
83 return true;
84 }
85 else
86 {
87 boolean nullOut = false;
88 for (Iterator iter = names.iterator(); iter.hasNext();)
89 {
90 String currentName = (String ) iter.next();
91
92 if(nullOut)
93 {
94 lastValues.remove(currentName);
95 }
96
97 if( currentName.equals(name))
98 {
99 nullOut = true;
100 }
101 }
102 return false;
103 }
104 }
105 }
106 }
107 } |
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