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1
28
29 package com.caucho.db.sql;
30
31 import com.caucho.log.Log;
32 import com.caucho.util.CharBuffer;
33
34 import java.sql.SQLException  ;
35 import java.util.ArrayList ;
36 import java.util.logging.Logger ;
37
38 class AndExpr extends Expr {
39 private static final Logger log = Log.open(AndExpr.class);
40
41 private ArrayList <Expr> _exprs = new ArrayList <Expr>();
42
43 AndExpr()
44 {
45 }
46
47 void add(Expr expr)
48 {
49 _exprs.add(expr);
50 }
51
52 Expr getSingleExpr()
53 {
54 if (_exprs.size() == 0)
55 return null;
56 else if (_exprs.size() == 1)
57 return _exprs.get(0);
58 else
59 return this;
60 }
61
62 protected Expr bind(Query query)
63 throws SQLException
64 {
65 for (int i = 0; i < _exprs.size(); i++) {
66 Expr expr = _exprs.get(i);
67
68 expr = expr.bind(query);
69
70 if (! expr.getType().equals(boolean.class))
71 throw new SQLException (L.l("AND requires boolean operands at {0}",
72 expr));
73
74 _exprs.set(i, expr);
75 }
76
77 return this;
78 }
79
80
83 public Class getType()
84 {
85 return boolean.class;
86 }
87
88
91 public long subCost(ArrayList <FromItem> fromList)
92 {
93 long cost = 0;
94
95 for (int i = 0; i < _exprs.size(); i++) {
96 cost += _exprs.get(i).subCost(fromList);
97 }
98
99 return cost;
100 }
101
102
105 public void splitAnd(ArrayList <Expr> andProduct)
106 {
107 for (int i = 0; i < _exprs.size(); i++) {
108 _exprs.get(i).splitAnd(andProduct);
109 }
110 }
111
112
115 public boolean isNull(QueryContext context)
116 throws SQLException
117 {
118 boolean isNull = false;
119 for (int i = 0; i < _exprs.size(); i++) {
120 int value = _exprs.get(i).evalBoolean(context);
121
122 if (value == FALSE)
123 return false;
124 else if (value != TRUE)
125 isNull = true;
126 }
127
128 return isNull;
129 }
130
131
134 public int evalBoolean(QueryContext context)
135 throws SQLException
136 {
137 int value = TRUE;
138
139 for (int i = 0; i < _exprs.size(); i++) {
140 int subValue = _exprs.get(i).evalBoolean(context);
141
142 if (subValue == FALSE)
143 return FALSE;
144 else if (subValue == UNKNOWN)
145 value = UNKNOWN;
146 }
147
148 return value;
149 }
150
151 public String evalString(QueryContext context)
152 throws SQLException
153 {
154 switch (evalBoolean(context)) {
155 case TRUE:
156 return "1";
157 case FALSE:
158 return "0";
159 default:
160 return null;
161 }
162 }
163
164 public String toString()
165 {
166 CharBuffer cb = CharBuffer.allocate();
167 cb.append("(");
168
169 for (int i = 0; i < _exprs.size(); i++) {
170 if (i != 0)
171 cb.append(" AND ");
172
173 cb.append(_exprs.get(i));
174 }
175
176 cb.append(")");
177
178 return cb.close();
179 }
180 }
181 |
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