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1 package com.genimen.djeneric.repository.oql.core.util;
2
3 import com.genimen.djeneric.repository.DjExtent;
4 import com.genimen.djeneric.repository.exceptions.ObjectNotDefinedException;
5 import com.genimen.djeneric.util.DjLogger;
6
7 public class JoinDefinition
8 {
9 DjExtent _from;
10 DjExtent _to;
11 String  _over;
12 String _fromAlias = null;
13 String _toAlias = null;
14 boolean _reversed;
15
16 public JoinDefinition(DjExtent from, DjExtent to, String over, boolean reversed)
17 {
18 _from = from;
19 _to = to;
20 _over = over;
21 _reversed = reversed;
22 }
23
24 public boolean isToAliasSet()
25 {
26 return _toAlias != null;
27 }
28
29 public boolean aliassesSet()
30 {
31 return _fromAlias != null && _toAlias != null;
32 }
33
34 public String toString()
35 {
36 try
37 {
38 return getJoin();
39 }
40 catch (ObjectNotDefinedException e)
41 {
42 DjLogger.log(e);
43 return e.getMessage();
44 }
45 }
46
47 public String getJoin() throws ObjectNotDefinedException
48 {
49 if (_reversed) return getAlias() + "." + _from.getIdProperty().getName() + " = " + getToAlias() + "." + _over;
50 else return getAlias() + "." + _over + " = " + getToAlias() + "." + _to.getIdProperty().getName();
51 }
52
53 public DjExtent getExtent()
54 {
55 return _from;
56 }
57
58 public String getAlias()
59 {
60 if (_fromAlias == null) return _from.getAlias();
61 return _fromAlias;
62 }
63
64 public DjExtent getToExtent()
65 {
66 return _to;
67 }
68
69 public void setFromAlias(String alias)
70 {
71 _fromAlias = alias.toLowerCase();
72 }
73
74 public void setToAlias(String alias)
75 {
76 _toAlias = alias.toLowerCase();
77 }
78
79 public void setFromAlias(int uid)
80 {
81 _fromAlias = createUniqueAlias(_from.getAlias(), uid);
82 }
83
84 private String createUniqueAlias(String alias, int uid)
85 {
86 if (alias.length() > 4) alias = alias.substring(0, 4);
87 return (alias + uid).toLowerCase();
88 }
89
90 public void setToAlias(int uid)
91 {
92 _toAlias = createUniqueAlias(_to.getAlias(), uid);
93 }
94
95 public String getToAlias()
96 {
97 if (_toAlias == null) return _to.getAlias();
98 return _toAlias;
99 }
100
101 public boolean isFromAliasSet()
102 {
103 return _fromAlias != null;
104 }
105
106 public boolean isReversed()
107 {
108 return _reversed;
109 }
110 } |
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