Source Code Cross Referenced for BinaryExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » ejb » ql » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.ejb.ql 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.ejb.ql;
030:
031:        import com.caucho.config.ConfigException;
032:        import com.caucho.util.CharBuffer;
033:
034:        /**
035:         * A binary expression
036:         */
037:        class BinaryExpr extends Expr {
038:            // binary operation
039:            private int _op;
040:            // left expression
041:            private Expr _left;
042:            // right expression
043:            private Expr _right;
044:
045:            /**
046:             * Creates a binary expression.
047:             *
048:             * @param op the operation
049:             * @param left the left expression
050:             * @param right the right expression
051:             */
052:            BinaryExpr(Query query, int op, Expr left, Expr right)
053:                    throws ConfigException {
054:                _query = query;
055:                _op = op;
056:                _left = left;
057:                _right = right;
058:
059:                evalTypes();
060:            }
061:
062:            Expr getLeft() {
063:                return _left;
064:            }
065:
066:            /**
067:             * Evaluates the types for the expression
068:             */
069:            void evalTypes() throws ConfigException {
070:                /*
071:                if (_left.getComponentCount() != _right.getComponentCount()) {
072:                  throw error(L.l("'{0}' has mismatched types '{1}' != '{2}'",
073:                                  this, _left.getJavaType().getName(),
074:                                  _right.getJavaType().getName()));
075:                }
076:                 */
077:
078:                switch (_op) {
079:                case Query.EQ:
080:                case Query.NE:
081:                    if (!_left.getJavaType().equals(_right.getJavaType())
082:                            && _left.isNumeric() != _right.isNumeric()
083:                            && !(_left.isDate() && _right.isDate()))
084:                        throw error(L.l(
085:                                "'{0}' has mismatched types '{1}' != '{2}'",
086:                                this , _left.getJavaType().getName(), _right
087:                                        .getJavaType().getName()));
088:                    setJavaType(boolean.class);
089:                    break;
090:
091:                case Query.LT:
092:                case Query.GT:
093:                case Query.LE:
094:                case Query.GE:
095:                    if (_left.isDate() && _right.isDate()) {
096:                    } else if (!_left.isNumeric())
097:                        throw error(L
098:                                .l(
099:                                        "'{0}' expects a numeric value at {1}.  Less-than and greater-than comparisons only make sense with numbers and dates.",
100:                                        this , _left.getJavaType().getName()));
101:                    else if (!_right.isNumeric())
102:                        throw error(L
103:                                .l(
104:                                        "'{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:                    /*
134:                    if (int.class.isAssignableFrom(_left.getJavaType()) &&
135:                        int.class.isAssignableFrom(_right.getJavaType()))
136:                      setJavaType(int.class);
137:                    else if (long.class.isAssignableFrom(_left.getJavaType()) &&
138:                             long.class.isAssignableFrom(_right.getJavaType()))
139:                      setJavaType(long.class);
140:                    else
141:                      setJavaType(double.class);
142:                     */
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 + " "
152:                            + (char) _op);
153:                }
154:            }
155:
156:            /**
157:             * Prints the where SQL for this expression
158:             *
159:             * @param gen the java code generator
160:             */
161:            void generateWhere(CharBuffer cb) {
162:                if (_left.isKey()) {
163:                    int componentCount = _left.getComponentCount();
164:
165:                    generateWhereComponents(cb, componentCount);
166:
167:                    return;
168:                } else if (_right.isKey()) {
169:                    int componentCount = _right.getComponentCount();
170:
171:                    generateWhereComponents(cb, componentCount);
172:
173:                    return;
174:                }
175:
176:                //_left.generateWhereSubExpr(cb);
177:                _left.generateComponent(cb, 0);
178:
179:                switch (_op) {
180:                case Query.EQ:
181:                    cb.append(" = ");
182:                    break;
183:                case Query.NE:
184:                    cb.append(" <> ");
185:                    break;
186:                case Query.LT:
187:                    cb.append(" < ");
188:                    break;
189:                case Query.GT:
190:                    cb.append(" > ");
191:                    break;
192:                case Query.LE:
193:                    cb.append(" <= ");
194:                    break;
195:                case Query.GE:
196:                    cb.append(" >= ");
197:                    break;
198:
199:                case Query.AND:
200:                    cb.append(" AND ");
201:                    break;
202:                case Query.OR:
203:                    cb.append(" OR ");
204:                    break;
205:
206:                default:
207:                    cb.append(" " + ((char) _op) + " ");
208:                    break;
209:                }
210:
211:                //_right.generateWhereSubExpr(cb);
212:                _right.generateComponent(cb, 0);
213:            }
214:
215:            private void generateWhereComponents(CharBuffer cb,
216:                    int componentCount) {
217:                for (int i = 0; i < componentCount; i++) {
218:                    if (i != 0)
219:                        cb.append(" AND ");
220:
221:                    _left.generateComponent(cb, i);
222:
223:                    if (_op == Query.EQ)
224:                        cb.append(" = ");
225:                    else if (_op == Query.NE)
226:                        cb.append(" <> ");
227:
228:                    _right.generateComponent(cb, i);
229:                }
230:            }
231:
232:            /**
233:             * Generates the where SQL for this expression
234:             */
235:            void generateWhereSubExpr(CharBuffer cb) {
236:                cb.append("(");
237:                generateWhere(cb);
238:                cb.append(")");
239:            }
240:
241:            void generateSelect(CharBuffer cb) {
242:                cb.append("(");
243:                generateWhere(cb);
244:                cb.append(")");
245:            }
246:
247:            public String toString() {
248:                CharBuffer value = CharBuffer.allocate();
249:
250:                if (_left instanceof  BinaryExpr) {
251:                    value.append("(");
252:                    value.append(_left.toString());
253:                    value.append(")");
254:                } else
255:                    value.append(_left.toString());
256:
257:                switch (_op) {
258:                case Query.EQ:
259:                    value.append(" = ");
260:                    break;
261:                case Query.NE:
262:                    value.append(" <> ");
263:                    break;
264:                case Query.LT:
265:                    value.append(" < ");
266:                    break;
267:                case Query.GT:
268:                    value.append(" > ");
269:                    break;
270:                case Query.LE:
271:                    value.append(" <= ");
272:                    break;
273:                case Query.GE:
274:                    value.append(" >= ");
275:                    break;
276:
277:                case Query.AND:
278:                    value.append(" AND ");
279:                    break;
280:                case Query.OR:
281:                    value.append(" OR ");
282:                    break;
283:
284:                default:
285:                    value.append(" " + ((char) _op) + " ");
286:                    break;
287:                }
288:
289:                if (_right instanceof  BinaryExpr) {
290:                    value.append("(");
291:                    value.append(_right.toString());
292:                    value.append(")");
293:                } else
294:                    value.append(_right.toString());
295:
296:                return value.close();
297:            }
298:        }
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