|
1
28
29 package com.caucho.ejb.ql;
30
31 import com.caucho.config.ConfigException;
32 import com.caucho.util.CharBuffer;
33
34
37 class BinaryExpr extends Expr {
38 private int _op;
40 private Expr _left;
42 private Expr _right;
44
45
52 BinaryExpr(Query query, int op, Expr left, Expr right)
53 throws ConfigException
54 {
55 _query = query;
56 _op = op;
57 _left = left;
58 _right = right;
59
60 evalTypes();
61 }
62
63 Expr getLeft()
64 {
65 return _left;
66 }
67
68
71 void evalTypes()
72 throws ConfigException
73 {
74
81
82 switch (_op) {
83 case Query.EQ:
84 case Query.NE:
85 if (! _left.getJavaType().equals(_right.getJavaType()) &&
86 _left.isNumeric() != _right.isNumeric() &&
87 ! (_left.isDate() && _right.isDate()))
88 throw error(L.l("`{0}' has mismatched types `{1}' != `{2}'",
89 this, _left.getJavaType().getName(),
90 _right.getJavaType().getName()));
91 setJavaType(boolean.class);
92 break;
93
94 case Query.LT:
95 case Query.GT:
96 case Query.LE:
97 case Query.GE:
98 if (_left.isDate() && _right.isDate()) {
99 }
100 else if (! _left.isNumeric())
101 throw error(L.l("`{0}' expects a numeric value at {1}. Less-than and greater-than comparisons only make sense with numbers and dates.",
102 this, _left.getJavaType().getName()));
103 else if (! _right.isNumeric())
104 throw error(L.l("`{0}' expects a numeric value at {1}. Less-than and greater-than comparisons only make sense with numbers and dates.",
105 this, _right.getJavaType().getName()));
106
107 setJavaType(boolean.class);
108 break;
109
110 case Query.AND:
111 case Query.OR:
112 if (! _left.isBoolean())
113 throw error(L.l("`{0}' expects a boolean value at {1}",
114 _left, _left.getJavaType().getName()));
115 if (! _right.isBoolean())
116 throw error(L.l("`{0}' expects a boolean value at {1}",
117 _right, _right.getJavaType().getName()));
118
119 setJavaType(boolean.class);
120 break;
121
122 case '+':
123 case '-':
124 case '*':
125 case '/':
126 if (! _left.isNumeric())
127 throw error(L.l("`{0}' expects a numeric value at {1}",
128 _left, _left.getJavaType().getName()));
129 if (! _right.isNumeric())
130 throw error(L.l("`{0}' expects a numeric value at {1}",
131 _right, _right.getJavaType().getName()));
132
133
143 if (isInteger(_left.getJavaType()) &&
144 isInteger(_right.getJavaType()))
145 setJavaType(long.class);
146 else
147 setJavaType(double.class);
148 break;
149
150 default:
151 throw new RuntimeException  ("unknown binary op:" + _op + " " + (char) _op);
152 }
153 }
154
155
160 void generateWhere(CharBuffer cb)
161 {
162 if (_left.isKey()) {
163 int componentCount = _left.getComponentCount();
164
165 generateWhereComponents(cb, componentCount);
166
167 return;
168 }
169 else if (_right.isKey()) {
170 int componentCount = _right.getComponentCount();
171
172 generateWhereComponents(cb, componentCount);
173
174 return;
175 }
176
177 _left.generateComponent(cb, 0);
179
180 switch (_op) {
181 case Query.EQ:
182 cb.append(" = ");
183 break;
184 case Query.NE:
185 cb.append(" <> ");
186 break;
187 case Query.LT:
188 cb.append(" < ");
189 break;
190 case Query.GT:
191 cb.append(" > ");
192 break;
193 case Query.LE:
194 cb.append(" <= ");
195 break;
196 case Query.GE:
197 cb.append(" >= ");
198 break;
199
200 case Query.AND:
201 cb.append(" AND ");
202 break;
203 case Query.OR:
204 cb.append(" OR ");
205 break;
206
207 default:
208 cb.append(" " + ((char) _op) + " ");
209 break;
210 }
211
212 _right.generateComponent(cb, 0);
214 }
215
216 private void generateWhereComponents(CharBuffer cb, int componentCount)
217 {
218 for (int i = 0; i < componentCount; i++) {
219 if (i != 0)
220 cb.append(" AND ");
221
222 _left.generateComponent(cb, i);
223
224 if (_op == Query.EQ)
225 cb.append(" = ");
226 else if (_op == Query.NE)
227 cb.append(" <> ");
228
229 _right.generateComponent(cb, i);
230 }
231 }
232
233
236 void generateWhereSubExpr(CharBuffer cb)
237 {
238 cb.append("(");
239 generateWhere(cb);
240 cb.append(")");
241 }
242
243 void generateSelect(CharBuffer cb)
244 {
245 cb.append("(");
246 generateWhere(cb);
247 cb.append(")");
248 }
249
250 public String toString()
251 {
252 CharBuffer value = CharBuffer.allocate();
253
254 if (_left instanceof BinaryExpr) {
255 value.append("(");
256 value.append(_left.toString());
257 value.append(")");
258 }
259 else
260 value.append(_left.toString());
261
262 switch (_op) {
263 case Query.EQ:
264 value.append(" = ");
265 break;
266 case Query.NE:
267 value.append(" <> ");
268 break;
269 case Query.LT:
270 value.append(" < ");
271 break;
272 case Query.GT:
273 value.append(" > ");
274 break;
275 case Query.LE:
276 value.append(" <= ");
277 break;
278 case Query.GE:
279 value.append(" >= ");
280 break;
281
282 case Query.AND:
283 value.append(" AND ");
284 break;
285 case Query.OR:
286 value.append(" OR ");
287 break;
288
289 default:
290 value.append(" " + ((char) _op) + " ");
291 break;
292 }
293
294 if (_right instanceof BinaryExpr) {
295 value.append("(");
296 value.append(_right.toString());
297 value.append(")");
298 }
299 else
300 value.append(_right.toString());
301
302 return value.close();
303 }
304 }
305 |
Popular Tags |
Java API By Example, From Geeks To Geeks.