Source Code Cross Referenced for FunExpr.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.ejb.cfg.FunctionSignature;
033:        import com.caucho.util.CharBuffer;
034:
035:        import java.util.ArrayList;
036:
037:        /**
038:         * A builtin SQL function expression
039:         */
040:        public class FunExpr extends Expr {
041:            static ArrayList<FunctionSignature> _standardFunctions;
042:
043:            // function name
044:            private String _name;
045:            // arguments
046:            private ArrayList<Expr> _args;
047:
048:            private ArrayList<FunctionSignature> _functions;
049:
050:            private FunctionSignature _sig;
051:
052:            /**
053:             * Creates a function expression.
054:             *
055:             * @param name the function name
056:             * @param args the function arguments
057:             */
058:            FunExpr(String name, ArrayList<Expr> args,
059:                    ArrayList<FunctionSignature> functions)
060:                    throws ConfigException {
061:                _name = name;
062:                _args = args;
063:                _functions = functions;
064:
065:                evalTypes();
066:            }
067:
068:            /**
069:             * Evaluates the types for the expression
070:             */
071:            void evalTypes() throws ConfigException {
072:                Class[] argTypes = getArgTypes();
073:
074:                _sig = null;
075:
076:                for (int i = 0; i < _functions.size(); i++) {
077:                    FunctionSignature sig = _functions.get(i);
078:
079:                    if (!_name.equalsIgnoreCase(sig.getName()))
080:                        continue;
081:
082:                    _sig = sig;
083:
084:                    Class[] funArgs = sig.getParameterTypes();
085:
086:                    if (funArgs.length != argTypes.length)
087:                        continue;
088:
089:                    boolean isMatch = true;
090:                    for (int j = 0; isMatch && j < funArgs.length; j++) {
091:                        if (argTypes[j].equals(funArgs[j]))
092:                            continue;
093:                        else if (Object.class.equals(funArgs[j]))
094:                            continue;
095:                        else if ((double.class.equals(funArgs[j]) || int.class
096:                                .equals(funArgs[j]))
097:                                && (double.class.equals(argTypes[j]) || int.class
098:                                        .equals(argTypes[j])))
099:                            continue;
100:                        else
101:                            isMatch = false;
102:                    }
103:
104:                    if (!isMatch)
105:                        continue;
106:
107:                    _sig = sig;
108:                    setJavaType(sig.getReturnType());
109:                    return;
110:                }
111:
112:                if (_sig != null)
113:                    throw error(L.l("`{0}' signature does not match `{1}'",
114:                            _name, _sig.getSignature()));
115:                else
116:                    throw error(L.l("unknown function `{0}'", _name));
117:            }
118:
119:            /**
120:             * Calculate the argument types.
121:             */
122:            private Class[] getArgTypes() {
123:                ArrayList<Class> argTypes = new ArrayList<Class>();
124:
125:                for (int i = 0; i < _args.size(); i++) {
126:                    Expr expr = _args.get(i);
127:
128:                    if (expr.isBoolean())
129:                        argTypes.add(boolean.class);
130:                    else if (expr.isInteger())
131:                        argTypes.add(int.class);
132:                    else if (expr.isNumeric())
133:                        argTypes.add(double.class);
134:                    else if (expr.isDate())
135:                        argTypes.add(java.util.Date.class);
136:                    else if (expr.isString())
137:                        argTypes.add(String.class);
138:                    else
139:                        argTypes.add(Object.class);
140:                }
141:
142:                return argTypes.toArray(new Class[argTypes.size()]);
143:            }
144:
145:            /**
146:             * Prints the where SQL for this expression
147:             *
148:             * @param gen the java code generator
149:             */
150:            void generateWhere(CharBuffer cb) {
151:                if (_sig != null && _sig.getSQL() != null)
152:                    generateWhereSQL(cb, _sig.getSQL());
153:                else {
154:                    cb.append(_name);
155:
156:                    cb.append("(");
157:                    for (int i = 0; i < _args.size(); i++) {
158:                        if (i != 0)
159:                            cb.append(", ");
160:
161:                        Expr expr = _args.get(i);
162:
163:                        expr.generateWhere(cb);
164:                    }
165:
166:                    cb.append(")");
167:                }
168:            }
169:
170:            /**
171:             * Prints the where SQL for this expression
172:             *
173:             * @param gen the java code generator
174:             */
175:            void generateWhereSQL(CharBuffer cb, String sql) {
176:                for (int i = 0; i < sql.length(); i++) {
177:                    char ch = sql.charAt(i);
178:                    char ch1;
179:
180:                    if (ch == '?' && i + 1 < sql.length()
181:                            && (ch1 = sql.charAt(i + 1)) >= '1' && ch1 <= '9') {
182:                        int index = ch1 - '0';
183:                        i++;
184:
185:                        if (index <= 0 || _args.size() < index)
186:                            throw new IllegalStateException(L.l(
187:                                    "illegal argument for sql `{0}'", sql));
188:
189:                        _args.get(index - 1).generateWhere(cb);
190:                    } else
191:                        cb.append(ch);
192:                }
193:            }
194:
195:            /**
196:             * Prints the select SQL for this expression
197:             *
198:             * @param gen the java code generator
199:             */
200:            void generateSelect(CharBuffer cb) {
201:                generateWhere(cb);
202:            }
203:
204:            /**
205:             * Returns a printable version of the function.
206:             */
207:            public String toString() {
208:                CharBuffer cb = new CharBuffer();
209:                cb.append(_name);
210:
211:                cb.append("(");
212:                for (int i = 0; i < _args.size(); i++) {
213:                    if (i != 0)
214:                        cb.append(", ");
215:
216:                    cb.append(_args.get(i));
217:                }
218:
219:                cb.append(")");
220:
221:                return cb.toString();
222:            }
223:
224:            public static ArrayList<FunctionSignature> getStandardFunctions() {
225:                return (ArrayList) _standardFunctions.clone();
226:            }
227:
228:            static void addFunction(String signature) {
229:                try {
230:                    FunctionSignature sig = new FunctionSignature(signature);
231:
232:                    _standardFunctions.add(sig);
233:                } catch (Exception e) {
234:                    e.printStackTrace();
235:                }
236:            }
237:
238:            static {
239:                _standardFunctions = new ArrayList<FunctionSignature>();
240:
241:                addFunction("int abs(int)");
242:                addFunction("double abs(double)");
243:
244:                addFunction("double acos(double)");
245:                addFunction("double sin(double)");
246:                addFunction("double atan(double)");
247:                addFunction("double cos(double)");
248:                addFunction("double cot(double)");
249:                addFunction("double degrees(double)");
250:                addFunction("double exp(double)");
251:                addFunction("double log(double)");
252:                addFunction("double log10(double)");
253:                addFunction("double radians(double)");
254:                addFunction("double sin(double)");
255:                addFunction("double sqrt(double)");
256:                addFunction("double tan(double)");
257:                addFunction("double pi()");
258:
259:                addFunction("int ceiling(double)");
260:                addFunction("int floor(double)");
261:                addFunction("int sign(double)");
262:
263:                addFunction("double atan2(double, double)");
264:                addFunction("double power(double, double)");
265:                addFunction("double round(double, double)");
266:                addFunction("double truncate(double, double)");
267:
268:                addFunction("int mod()");
269:                addFunction("int rand()");
270:
271:                addFunction("int count(any)");
272:                addFunction("double sum(any)");
273:
274:                addFunction("int min(int)");
275:                addFunction("int max(int)");
276:
277:                addFunction("double min(double)");
278:                addFunction("double max(double)");
279:
280:                addFunction("int ascii(String)");
281:                addFunction("int length(String)");
282:
283:                addFunction("String char(int)");
284:                addFunction("String space(int)");
285:
286:                addFunction("String concat(String, String)");
287:
288:                addFunction("int difference(String, String)");
289:
290:                addFunction("String insert(String, int, int, String)");
291:
292:                addFunction("String lcase(String)");
293:                addFunction("String ltrim(String)");
294:                addFunction("String rtrim(String)");
295:                addFunction("String ucase(String)");
296:                addFunction("String soundex(String)");
297:
298:                addFunction("String left(String, int)");
299:                addFunction("String repeat(String, int)");
300:                addFunction("String right(String, int)");
301:
302:                addFunction("int locate(String, String)");
303:                addFunction("int locate(String, String, int)");
304:
305:                addFunction("String replace(String, String, String)");
306:
307:                addFunction("String substring(String, int, int)");
308:
309:                addFunction("String database()");
310:                addFunction("String user()");
311:
312:                addFunction("Date curdate()");
313:                addFunction("Date curtime()");
314:                addFunction("Date now()");
315:
316:                addFunction("String dayname(Date)");
317:                addFunction("String monthname(Date)");
318:
319:                addFunction("int dayofmonth(Date)");
320:                addFunction("int dayofweek(Date)");
321:                addFunction("int dayofyear(Date)");
322:                addFunction("int hour(Date)");
323:                addFunction("int minute(Date)");
324:                addFunction("int month(Date)");
325:                addFunction("int quarter(Date)");
326:                addFunction("int second(Date)");
327:                addFunction("int week(Date)");
328:                addFunction("int year(Date)");
329:
330:                addFunction("Date timestampadd(Date, Date)");
331:                addFunction("Date timestampdiff(Date, Date)");
332:            }
333:        }
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