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1
28
29 package com.caucho.amber.expr;
30
31 import com.caucho.amber.query.FromItem;
32 import com.caucho.amber.query.QueryParseException;
33 import com.caucho.amber.query.QueryParser;
34 import com.caucho.util.CharBuffer;
35
36 import java.util.ArrayList  ;
37
38
41 public class AndExpr extends AbstractAmberExpr {
42 private ArrayList <AmberExpr> _components = new ArrayList <AmberExpr>();
43
44
47 public static AmberExpr create(AmberExpr left, AmberExpr right)
48 throws QueryParseException
49 {
50 if (left == null && right == null)
51 return null;
52 else if (left == null)
53 return right.createBoolean();
54 else if (right == null)
55 return left.createBoolean();
56 else if (left instanceof AndExpr) {
57 AndExpr and = (AndExpr) left;
58 and.add(right.createBoolean());
59 return and;
60 }
61 else if (right instanceof AndExpr) {
62 AndExpr and = (AndExpr) right;
63 and.add(left.createBoolean());
64 return and;
65 }
66 else {
67 AndExpr and = new AndExpr();
68 and.add(left.createBoolean());
69 and.add(right.createBoolean());
70
71 return and;
72 }
73 }
74
77 public boolean isBoolean()
78 {
79 return true;
80 }
81
82
85 public void add(AmberExpr expr)
86 {
87 _components.add(expr);
88 }
89
90
93 public ArrayList <AmberExpr> getComponents()
94 {
95 return _components;
96 }
97
98
101 public AmberExpr bindSelect(QueryParser parser)
102 {
103 for (int i = 0; i < _components.size(); i++) {
104 AmberExpr expr = _components.get(i);
105
106 expr = expr.bindSelect(parser);
107
108 _components.set(i, expr);
109 }
110
111 return this;
112 }
113
114
117 public AmberExpr getSingle()
118 {
119 if (_components.size() == 0)
120 return null;
121 else if (_components.size() == 1)
122 return _components.get(0);
123 else
124 return this;
125 }
126
127
128
131 public boolean usesFrom(FromItem from, int type, boolean isNot)
132 {
133 if (type == IS_INNER_JOIN) {
134 for (int i = 0; i < _components.size(); i++) {
136 AmberExpr expr = _components.get(i);
137
138 if (! isNot && expr.usesFrom(from, type, isNot))
139 return true;
140 else if (isNot && ! expr.usesFrom(from, type, isNot))
141 return false;
142 }
143
144 return false;
145 }
146 else {
147 for (int i = 0; i < _components.size(); i++) {
148 AmberExpr expr = _components.get(i);
149
150 if (expr.usesFrom(from, type))
151 return true;
152 }
153
154 return false;
155 }
156 }
157
158
161 @Override
162 public boolean exists(FromItem from)
163 {
164 for (int i = 0; i < _components.size(); i++) {
165 if (_components.get(i).exists(from))
166 return true;
167 }
168
169 return false;
170 }
171
172
175 public AmberExpr replaceJoin(JoinExpr join)
176 {
177 for (int i = 0; i < _components.size(); i++) {
178 AmberExpr expr = _components.get(i);
179
180 expr = expr.replaceJoin(join);
181
182 _components.set(i, expr);
183 }
184
185 return this;
186 }
187
188
191 public void generateWhere(CharBuffer cb)
192 {
193 generateInternalWhere(cb, true);
194 }
195
196
199 public void generateUpdateWhere(CharBuffer cb)
200 {
201 generateInternalWhere(cb, false);
202 }
203
204
207 public void generateHaving(CharBuffer cb)
208 {
209 generateWhere(cb);
210 }
211
212
215 public void generateJoin(CharBuffer cb)
216 {
217 cb.append('(');
218
219 for (int i = 0; i < _components.size(); i++) {
220 if (i != 0)
221 cb.append(" and ");
222
223 AmberExpr expr = _components.get(i);
224
225 expr.generateJoin(cb);
226 }
227
228 cb.append(')');
229 }
230
231
234 private void generateInternalWhere(CharBuffer cb,
235 boolean select)
236 {
237 cb.append('(');
238
239 for (int i = 0; i < _components.size(); i++) {
240 if (i != 0)
241 cb.append(" and ");
242
243 AmberExpr expr = _components.get(i);
244
245 if (select)
246 expr.generateWhere(cb);
247 else
248 expr.generateUpdateWhere(cb);
249 }
250
251 cb.append(')');
252 }
253 }
254 |
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