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1
10
11 package com.triactive.jdo.store;
12
13 import java.util.ArrayList  ;
14 import java.util.Collection ;
15 import java.util.Collections ;
16 import java.util.Iterator ;
17 import java.util.List ;
18 import javax.jdo.JDOFatalInternalException;
19
20
21 abstract class Key
22 {
23 protected BaseTable table;
24 protected ArrayList columns = new ArrayList ();
25
26
27 protected Key(BaseTable table)
28 {
29 this.table = table;
30 }
31
32
33 protected void assertSameTable(Column col)
34 {
35 if (!table.equals(col.getTable()))
36 throw new JDOFatalInternalException("Cannot add " + col + " as key column for " + table);
37 }
38
39
40 public BaseTable getTable()
41 {
42 return table;
43 }
44
45
46 public List getColumns()
47 {
48 return Collections.unmodifiableList(columns);
49 }
50
51
52 public String getColumnList()
53 {
54 return getColumnList(columns);
55 }
56
57
58 public boolean startsWith(Key k)
59 {
60 int kSize = k.columns.size();
61
62 return kSize <= columns.size() && k.columns.equals(columns.subList(0, kSize));
63 }
64
65
66 protected static void setMinSize(List list, int size)
67 {
68 while (list.size() < size)
69 list.add(null);
70 }
71
72
73 public static String getColumnList(Collection cols)
74 {
75 StringBuffer s = new StringBuffer ("(");
76 Iterator i = cols.iterator();
77
78 while (i.hasNext())
79 {
80 Column col = (Column)i.next();
81
82 if (col == null)
83 s.append('?');
84 else
85 s.append(col.getName());
86
87 if (i.hasNext())
88 s.append(',');
89 }
90
91 s.append(')');
92
93 return s.toString();
94 }
95 }
96 |
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