Source Code Cross Referenced for Function.java in  » Database-DBMS » hsql » org » hsqldb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 1995-2000, The Hypersonic SQL Group.
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the Hypersonic SQL Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         *
030:         * This software consists of voluntary contributions made by many individuals 
031:         * on behalf of the Hypersonic SQL Group.
032:         *
033:         *
034:         * For work added by the HSQL Development Group:
035:         *
036:         * Copyright (c) 2001-2005, The HSQL Development Group
037:         * All rights reserved.
038:         *
039:         * Redistribution and use in source and binary forms, with or without
040:         * modification, are permitted provided that the following conditions are met:
041:         *
042:         * Redistributions of source code must retain the above copyright notice, this
043:         * list of conditions and the following disclaimer.
044:         *
045:         * Redistributions in binary form must reproduce the above copyright notice,
046:         * this list of conditions and the following disclaimer in the documentation
047:         * and/or other materials provided with the distribution.
048:         *
049:         * Neither the name of the HSQL Development Group nor the names of its
050:         * contributors may be used to endorse or promote products derived from this
051:         * software without specific prior written permission.
052:         *
053:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
054:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
055:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
056:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
057:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
058:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
059:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
060:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
061:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
062:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
063:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
064:         */
065:
066:        package org.hsqldb;
067:
068:        import java.lang.reflect.InvocationTargetException;
069:        import java.lang.reflect.Method;
070:        import java.lang.reflect.Modifier;
071:        import java.sql.Connection;
072:
073:        import org.hsqldb.lib.HashMap;
074:        import org.hsqldb.lib.HsqlArrayList;
075:        import org.hsqldb.lib.StringConverter;
076:        import org.hsqldb.types.Binary;
077:        import org.hsqldb.types.JavaObject;
078:
079:        // fredt@users 20020912 - patch 1.7.1 - shortcut treatment of identity() call
080:        // fredt@users 20020912 - patch 1.7.1 - cache java.lang.reflect.Method objects
081:        // fredt@users 20021013 - patch 1.7.1 - ignore non-static methods
082:        // boucherb@users 20030201 - patch 1.7.2 - direct calls for org.hsqldb.Library
083:        // fredt@users 20030621 - patch 1.7.2 - shortcut treatment of session calls
084:        // boucherb@users 200404xx - doc 1.7.2 - updates toward 1.7.2 final
085:
086:        /**
087:         * Provides services to evaluate SQL function and stored procedure calls,
088:         * by invoking Java methods.
089:         *
090:         * Extended in successive versions of HSQLDB.
091:         *
092:         * @author Thomas Mueller (Hypersonic SQL Group)
093:         * @version 1.8.0
094:         * @since Hypersonic SQL
095:         */
096:        class Function {
097:
098:            private String sFunction;
099:            private Method mMethod;
100:            private String returnClassName;
101:            private Class[] aArgClasses;
102:            private int iReturnType;
103:            private int iArgCount;
104:            private int iSqlArgCount;
105:            private int iSqlArgStart;
106:            private int[] iArgType;
107:            private boolean[] bArgNullable;
108:            Expression[] eArg;
109:            private boolean bConnection;
110:            private static HashMap methodCache = new HashMap();
111:            private int fID;
112:            String name; // name used to call function
113:            boolean isSimple; //CURRENT_TIME, NOW etc.
114:            boolean hasAggregate;
115:
116:            /**
117:             * Constructs a new Function object with the given function call name
118:             * and using the specified Session context. <p>
119:             *
120:             * The call name is the fully qualified name of a static Java method, in
121:             * the form "package.class.method."  This implies that Java
122:             * methods with the same fully qualified name but different signatures
123:             * cannot be used properly as HSQLDB SQL functions or stored procedures.
124:             * For instance, it is impossible to call both System.getProperty(String)
125:             * and System.getProperty(String,String) under this arrangement, because
126:             * the HSQLDB Function object is unable to differentiate between the two;
127:             * it simply chooses the first method matching the FQN in the array of
128:             * methods obtained from calling getMethods() on an instance of the
129:             * Class indicated in the FQN, hiding all other methods with the same
130:             * FQN. <p>
131:             *
132:             * The function FQN must match at least one static Java method FQN in the
133:             * specified class or construction cannot procede and an HsqlException is
134:             * thrown. <p>
135:             *
136:             * The isSimple parameter is true when certain SQL standard functions
137:             * that are used without brackets are invokded.
138:             *
139:             * @param name this Function object's call name
140:             * @param fqn the fully qualified name of a Java method
141:             * @param isSimple if true, used to evalate CURRENT_TIME, NOW etc.
142:             *      evaluate
143:             * @throws HsqlException if the specified function FQN corresponds to no
144:             *      Java method
145:             */
146:            Function(String name, String fqn, boolean isSimple)
147:                    throws HsqlException {
148:
149:                this .name = name;
150:                this .isSimple = isSimple;
151:
152:                //        cSession      = session;
153:                sFunction = fqn;
154:                fID = Library.functionID(fqn);
155:
156:                int i = fqn.lastIndexOf('.');
157:
158:                Trace.check(i != -1, Trace.UNEXPECTED_TOKEN, fqn);
159:
160:                String classname = fqn.substring(0, i);
161:
162:                mMethod = (Method) methodCache.get(fqn);
163:
164:                if (mMethod == null) {
165:                    String methodname = fqn.substring(i + 1);
166:                    Class classinstance = null;
167:
168:                    try {
169:                        classinstance = Class.forName(classname);
170:                    } catch (Exception e) {
171:                        throw Trace.error(Trace.FUNCTION_NOT_FOUND,
172:                                Trace.Message_Pair,
173:                                new Object[] { classname, e });
174:                    }
175:
176:                    // public only, but includes those inherited from
177:                    // superclasses and superinterfaces.  List is unordered.
178:                    Method[] methods = classinstance.getMethods();
179:
180:                    for (i = 0; i < methods.length; i++) {
181:                        Method m = methods[i];
182:
183:                        if (m.getName().equals(methodname)
184:                                && Modifier.isStatic(m.getModifiers())) {
185:                            mMethod = m;
186:
187:                            break;
188:                        }
189:                    }
190:
191:                    Trace.check(mMethod != null, Trace.UNKNOWN_FUNCTION,
192:                            methodname);
193:                    methodCache.put(fqn, mMethod);
194:                }
195:
196:                Class returnClass = mMethod.getReturnType();
197:
198:                if (returnClass.equals(org.hsqldb.Result.class)) {
199:
200:                    // For now, we can write stored procedures whose
201:                    // descriptor explicitly specifies the above return type.
202:                    // Later, this will be modified or replaced to provide proper
203:                    // support for jdbcCallableStatement OUT mode return parameter,
204:                    // multiple results (Result.MULTI etc.)
205:                    iReturnType = Types.OTHER;
206:                } else {
207:
208:                    // Now we support the following construction-time return type
209:                    // Classes, as specified by the method descriptor:
210:                    //
211:                    // 1.) any primitive or primitive wrapper type, except Byte(.TYPE),
212:                    //     Short(.TYPE) and Float(.TYPE) (TBD; narrow if no truncation)
213:                    //
214:                    // 2.) any primitive array type
215:                    //
216:                    // 3.) any non-primitive array whose base component implements
217:                    // java.io.Serializable
218:                    //
219:                    // 4.) any class implementing java.io.Serializable, except those
220:                    //     described in 1.) as currently unsupported
221:                    //
222:                    // 5.) java.lang.Object
223:                    //
224:                    // For java.lang.Object, checking is deferred from the construction
225:                    // stage to the evaluation stage.  In general, for the evaluation
226:                    // to succeed, the runtime class of the retrieved Object must be
227:                    //
228:                    // 1.) any primitive or primitive wrapper type, except Byte(.TYPE),
229:                    //     Short(.TYPE) and Float(.TYPE) (TBD; narrow if no trunction)
230:                    //
231:                    // 2.) any primitive array type
232:                    // 3.) any non-primitive array whose base component implements
233:                    //     java.io.Serializable
234:                    //
235:                    // 4.) any class implementing java.io.Serializable, except those
236:                    //     described in 1.) as currently unsupported
237:                    //
238:                    // Additionally, it is possible for the evaluation to succeed under
239:                    // an SQL CALL if the runtime Class of the returned Object is not
240:                    // from the list above but is from the list below:
241:                    //
242:                    // 1.) is org.hsqldb.Result
243:                    // 2.) is org.hsqldb.jdbc.jdbcResultSet
244:                    //
245:                    // In these special cases, the statement executor notices the
246:                    // types and presents the client with a view the underlying result
247:                    // rather than with a view of the object as an opaque scalar value
248:                    //
249:                    iReturnType = Types.getParameterTypeNr(returnClass);
250:                }
251:
252:                returnClassName = Types.getFunctionReturnClassName(returnClass
253:                        .getName());
254:                aArgClasses = mMethod.getParameterTypes();
255:                iArgCount = aArgClasses.length;
256:                iArgType = new int[iArgCount];
257:                bArgNullable = new boolean[iArgCount];
258:
259:                for (i = 0; i < aArgClasses.length; i++) {
260:                    Class a = aArgClasses[i];
261:                    String type = a.getName();
262:
263:                    if ((i == 0) && a.equals(Connection.class)) {
264:
265:                        // TODO: provide jdbc:default:connection url functionality
266:                        //
267:                        // only the first parameter can be a Connection
268:                        bConnection = true;
269:                    } else {
270:
271:                        // see discussion above for iReturnType
272:                        iArgType[i] = Types.getParameterTypeNr(a);
273:                        bArgNullable[i] = !a.isPrimitive();
274:                    }
275:                }
276:
277:                iSqlArgCount = iArgCount;
278:
279:                if (bConnection) {
280:                    iSqlArgCount--;
281:
282:                    iSqlArgStart = 1;
283:                } else {
284:                    iSqlArgStart = 0;
285:                }
286:
287:                eArg = new Expression[iArgCount];
288:            }
289:
290:            /**
291:             * Evaluates and returns this Function in the context of the session.<p>
292:             */
293:            Object getValue(Session session) throws HsqlException {
294:
295:                switch (fID) {
296:
297:                case Library.curtime:
298:                    return session.getCurrentTime();
299:
300:                case Library.curdate:
301:                    return session.getCurrentDate();
302:
303:                case Library.database:
304:                    return session.getDatabase().getPath();
305:
306:                case Library.getAutoCommit:
307:                    return session.isAutoCommit() ? Boolean.TRUE
308:                            : Boolean.FALSE;
309:
310:                case Library.identity:
311:                    return session.getLastIdentity();
312:
313:                case Library.isReadOnlyDatabase:
314:                    return session.getDatabase().databaseReadOnly ? Boolean.TRUE
315:                            : Boolean.FALSE;
316:
317:                case Library.isReadOnlyConnection:
318:                    return session.isReadOnly() ? Boolean.TRUE : Boolean.FALSE;
319:
320:                case Library.isReadOnlyDatabaseFiles:
321:                    return session.getDatabase().isFilesReadOnly() ? Boolean.TRUE
322:                            : Boolean.FALSE;
323:
324:                case Library.now:
325:                    return session.getCurrentTimestamp();
326:
327:                case Library.user:
328:                    return session.getUsername();
329:                }
330:
331:                Object[] oArg = getArguments(session);
332:
333:                if (oArg == null) {
334:                    return null;
335:                }
336:
337:                return getValue(session, oArg);
338:            }
339:
340:            /**
341:             * Evaluates the Function with the given arguments in the session context.
342:             */
343:            Object getValue(Session session, Object[] arguments)
344:                    throws HsqlException {
345:
346:                if (bConnection) {
347:                    arguments[0] = session.getInternalConnection();
348:                }
349:
350:                try {
351:                    Object ret = (fID >= 0) ? Library.invoke(fID, arguments)
352:                            : mMethod.invoke(null, arguments);
353:
354:                    return Column.convertObject(ret, iReturnType);
355:                } catch (InvocationTargetException e) {
356:
357:                    // thrown by user functions
358:                    Throwable t = e.getTargetException();
359:                    String s = sFunction + " : " + t.toString();
360:
361:                    throw Trace.error(Trace.FUNCTION_CALL_ERROR, s);
362:                } catch (IllegalAccessException e) {
363:
364:                    // never thrown in this method
365:                    throw Trace.error(Trace.FUNCTION_CALL_ERROR);
366:                }
367:
368:                // Library function throw HsqlException
369:            }
370:
371:            private Object[] getArguments(Session session) throws HsqlException {
372:
373:                int i = bConnection ? 1 : 0;
374:                Object[] oArg = new Object[iArgCount];
375:
376:                for (; i < iArgCount; i++) {
377:                    Expression e = eArg[i];
378:                    Object o = null;
379:
380:                    if (e != null) {
381:
382:                        // no argument: null
383:                        o = e.getValue(session, iArgType[i]);
384:                    }
385:
386:                    if ((o == null) && !bArgNullable[i]) {
387:
388:                        // null argument for primitive datatype: don't call
389:                        return null;
390:                    }
391:
392:                    if (o instanceof  JavaObject) {
393:                        o = ((JavaObject) o).getObject();
394:                    } else if (o instanceof  Binary) {
395:                        o = ((Binary) o).getBytes();
396:                    }
397:
398:                    oArg[i] = o;
399:                }
400:
401:                return oArg;
402:            }
403:
404:            /**
405:             * returns null if any non-nullable element of values is null
406:             */
407:            private Object[] getNotNull(Object[] values) throws HsqlException {
408:
409:                int i = bConnection ? 1 : 0;
410:
411:                for (; i < iArgCount; i++) {
412:                    Object o = values[i];
413:
414:                    if (o == null && !bArgNullable[i]) {
415:
416:                        // null argument for primitive datatype: don't call
417:                        return null;
418:                    }
419:                }
420:
421:                return values;
422:            }
423:
424:            void collectInGroupByExpressions(HsqlArrayList colExps) {
425:
426:                for (int i = 0; i < iArgCount; i++) {
427:                    Expression e = eArg[i];
428:
429:                    if (e != null) {
430:                        e.collectInGroupByExpressions(colExps);
431:                    }
432:                }
433:            }
434:
435:            Object getAggregatedValue(Session session, Object currValue)
436:                    throws HsqlException {
437:
438:                Object[] valueArray = (Object[]) currValue;
439:
440:                if (valueArray == null) {
441:                    valueArray = new Object[iArgCount];
442:                }
443:
444:                for (int i = 0; i < iArgCount; i++) {
445:                    Expression e = eArg[i];
446:
447:                    if (eArg[i] != null) {
448:                        if (eArg[i].isAggregate()) {
449:                            valueArray[i] = Column
450:                                    .convertObject(e.getAggregatedValue(
451:                                            session, valueArray[i]),
452:                                            iArgType[i]);
453:                        } else {
454:                            valueArray[i] = e.getValue(session, iArgType[i]);
455:                        }
456:                    }
457:                }
458:
459:                valueArray = getNotNull(valueArray);
460:
461:                if (valueArray == null) {
462:                    return null;
463:                }
464:
465:                return getValue(session, valueArray);
466:            }
467:
468:            Object updateAggregatingValue(Session session, Object currValue)
469:                    throws HsqlException {
470:
471:                Object[] valueArray = (Object[]) currValue;
472:
473:                if (valueArray == null) {
474:                    valueArray = new Object[iArgCount];
475:                }
476:
477:                for (int i = 0; i < iArgCount; i++) {
478:                    Expression e = eArg[i];
479:
480:                    if (eArg[i] != null) {
481:                        valueArray[i] = e.updateAggregatingValue(session,
482:                                valueArray[i]);
483:                    }
484:                }
485:
486:                return valueArray;
487:            }
488:
489:            /**
490:             * Returns the number of parameters that must be supplied to evaluate
491:             * this Function object from SQL.  <p>
492:             *
493:             * This value may be different than the number of parameters of the
494:             * underlying Java method.  This is because HSQLDB automatically detects
495:             * if the first parameter is of type java.sql.Connection, and supplies a
496:             * live Connection object constructed from the evaluating session context
497:             * if so.
498:             */
499:            int getArgCount() {
500:                return iSqlArgCount;
501:            }
502:
503:            /**
504:             * Remnoves the Table filters from Expression parameters to this Function.
505:             *
506:             * @throws HsqlException if there is a problem resolving a parameter
507:             * against the specified TableFilter
508:             */
509:            /*
510:             void removeFilters() throws HsqlException {
511:
512:             Expression e;
513:
514:             for (int i = iSqlArgStart; i < iArgCount; i++) {
515:             e = eArg[i];
516:
517:             if (e != null) {
518:             e.removeFilters();
519:             }
520:             }
521:             }
522:             */
523:            void replaceAliases(Expression[] columns, int length)
524:                    throws HsqlException {
525:
526:                Expression e;
527:
528:                for (int i = iSqlArgStart; i < iArgCount; i++) {
529:                    e = eArg[i];
530:
531:                    if (e != null) {
532:                        if (e.exprType == Expression.COLUMN) {
533:                            eArg[i] = e.getExpressionForAlias(columns, length);
534:                        } else {
535:                            e.replaceAliases(columns, length);
536:                        }
537:                    }
538:                }
539:            }
540:
541:            /**
542:             * Checks the Expresion parameters to this Function object against the
543:             * set of TableFilter.
544:             */
545:            void checkTables(HsqlArrayList fa) throws HsqlException {
546:
547:                Expression e;
548:
549:                for (int i = iSqlArgStart; i < iArgCount; i++) {
550:                    e = eArg[i];
551:
552:                    if (e != null) {
553:                        e.checkTables(fa);
554:                    }
555:                }
556:            }
557:
558:            /**
559:             * Resolves the Expression parameters to this Function object against the
560:             * specified TableFilter.
561:             */
562:            void resolveTables(TableFilter f) throws HsqlException {
563:
564:                Expression e;
565:
566:                for (int i = iSqlArgStart; i < iArgCount; i++) {
567:                    e = eArg[i];
568:
569:                    if (e != null) {
570:                        e.resolveTables(f);
571:                    }
572:                }
573:            }
574:
575:            /**
576:             * Resolves the type of this expression and performs certain
577:             * transformations and optimisations of the expression tree.
578:             */
579:            void resolveType(Session session) throws HsqlException {
580:
581:                Expression e;
582:
583:                for (int i = iSqlArgStart; i < iArgCount; i++) {
584:                    e = eArg[i];
585:
586:                    if (e != null) {
587:                        if (e.isParam()) {
588:                            e.setDataType(iArgType[i]);
589:
590:                            e.nullability = getArgNullability(i);
591:                            e.valueClassName = getArgClass(i).getName();
592:                        } else {
593:                            e.resolveTypes(session);
594:                        }
595:                    }
596:                }
597:            }
598:
599:            /**
600:             * Checks each of this object's arguments for resolution, throwing an
601:             * HsqlException if any arguments have not yet been resolved. <p>
602:             * The check boolean argument is passed on to further check calls.<p>
603:             */
604:            boolean checkResolved(boolean check) throws HsqlException {
605:
606:                boolean result = true;
607:
608:                for (int i = iSqlArgStart; i < iArgCount; i++) {
609:                    if (eArg[i] != null) {
610:                        result = result && eArg[i].checkResolved(check);
611:                    }
612:                }
613:
614:                return result;
615:            }
616:
617:            /**
618:             * Returns the type of the argument at the specified
619:             * offset in this Function object's paramter list. <p>
620:             */
621:            int getArgType(int i) {
622:                return iArgType[i];
623:            }
624:
625:            /**
626:             * Returns the type of this Function
627:             * object's return type. <p>
628:             */
629:            int getReturnType() {
630:                return iReturnType;
631:            }
632:
633:            /**
634:             * Binds the specified expression to the specified position in this
635:             * Function object's parameter list. <p>
636:             */
637:            void setArgument(int i, Expression e) {
638:
639:                if (bConnection) {
640:                    i++;
641:                }
642:
643:                eArg[i] = e;
644:                hasAggregate = hasAggregate || (e != null && e.isAggregate());
645:            }
646:
647:            /**
648:             * Returns a DDL representation of this object. <p>
649:             */
650:            String getDLL() throws HsqlException {
651:
652:                StringBuffer sb = new StringBuffer();
653:
654:                // get the name as used by the CHECK statement
655:                String ddlName = name;
656:
657:                if (isSimple) {
658:                    return name;
659:                } else if (Token.T_TRIM.equals(name)) {
660:
661:                    // special case for TRIM
662:                    sb.append(name).append('(');
663:
664:                    boolean leading = eArg[2].testCondition(null);
665:                    boolean trailing = eArg[3].testCondition(null);
666:
667:                    if (leading && trailing) {
668:                        sb.append(Token.T_BOTH);
669:                    } else {
670:                        sb.append(leading ? Token.T_LEADING : Token.T_TRAILING);
671:                    }
672:
673:                    // to do change to string
674:                    sb.append(' ');
675:
676:                    String charval = (String) eArg[1].getValue(null);
677:
678:                    sb.append(Column.createSQLString(charval)).append(' ');
679:                    sb.append(Token.T_FROM).append(' ');
680:                    sb.append(eArg[0].getDDL()).append(')');
681:
682:                    return sb.toString();
683:                }
684:
685:                if (sFunction.equals(name)) {
686:                    ddlName = StringConverter.toQuotedString(name, '"', true);
687:                }
688:
689:                sb.append(ddlName).append('(');
690:
691:                for (int i = iSqlArgStart; i < eArg.length; i++) {
692:                    sb.append(eArg[i].getDDL());
693:
694:                    if (i < eArg.length - 1) {
695:                        sb.append(',');
696:                    }
697:                }
698:
699:                sb.append(')');
700:
701:                return sb.toString();
702:            }
703:
704:            /**
705:             * Returns a String representation of this object. <p>
706:             */
707:            public String describe(Session session) {
708:
709:                StringBuffer sb = new StringBuffer();
710:
711:                sb.append(super .toString()).append("=[\n");
712:                sb.append(sFunction).append("(");
713:
714:                for (int i = iSqlArgStart; i < eArg.length; i++) {
715:                    sb.append("[").append(eArg[i].describe(session))
716:                            .append("]");
717:                }
718:
719:                sb.append(") returns ").append(
720:                        Types.getTypeString(getReturnType()));
721:                sb.append("]\n");
722:
723:                return sb.toString();
724:            }
725:
726:            /**
727:             * Returns the Java Class of the object returned by getValue(). <p>
728:             */
729:            String getReturnClassName() {
730:                return returnClassName;
731:            }
732:
733:            /**
734:             * Returns the Java Class of the i'th argument. <p>
735:             */
736:            Class getArgClass(int i) {
737:                return aArgClasses[i];
738:            }
739:
740:            /**
741:             * Returns the SQL nullability code of the i'th argument. <p>
742:             */
743:            int getArgNullability(int i) {
744:                return bArgNullable[i] ? Expression.NULLABLE
745:                        : Expression.NO_NULLS;
746:            }
747:
748:            Method getMethod() {
749:                return mMethod;
750:            }
751:        }
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