Source Code Cross Referenced for GeneralComparison.java in  » XML » saxonb » net » sf » saxon » expr » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.expr 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.expr;
002:
003:        import net.sf.saxon.om.Item;
004:        import net.sf.saxon.om.SequenceIterator;
005:        import net.sf.saxon.sort.AtomicComparer;
006:        import net.sf.saxon.sort.CodepointCollator;
007:        import net.sf.saxon.trans.DynamicError;
008:        import net.sf.saxon.trans.StaticError;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.type.*;
011:        import net.sf.saxon.value.*;
012:        import net.sf.saxon.functions.Position;
013:        import net.sf.saxon.functions.SystemFunction;
014:        import net.sf.saxon.functions.Minimax;
015:
016:        import java.util.Comparator;
017:
018:        /**
019:         * GeneralComparison: a boolean expression that compares two expressions
020:         * for equals, not-equals, greater-than or less-than. This implements the operators
021:         * =, !=, <, >, etc. This implementation is not used when in backwards-compatible mode
022:         */
023:
024:        public class GeneralComparison extends BinaryExpression {
025:
026:            protected int singletonOperator;
027:            protected AtomicComparer comparer;
028:
029:            /**
030:             * Create a relational expression identifying the two operands and the operator
031:             *
032:             * @param p0 the left-hand operand
033:             * @param op the operator, as a token returned by the Tokenizer (e.g. Token.LT)
034:             * @param p1 the right-hand operand
035:             */
036:
037:            public GeneralComparison(Expression p0, int op, Expression p1) {
038:                super (p0, op, p1);
039:                singletonOperator = getSingletonOperator(op);
040:            }
041:
042:            /**
043:             * Determine the static cardinality. Returns [1..1]
044:             */
045:
046:            public int computeCardinality() {
047:                return StaticProperty.EXACTLY_ONE;
048:            }
049:
050:            /**
051:             * Type-check the expression
052:             *
053:             * @return the checked expression
054:             */
055:
056:            public Expression typeCheck(StaticContext env,
057:                    ItemType contextItemType) throws XPathException {
058:
059:                final TypeHierarchy th = env.getNamePool().getTypeHierarchy();
060:
061:                operand0 = operand0.typeCheck(env, contextItemType);
062:                operand1 = operand1.typeCheck(env, contextItemType);
063:
064:                // If either operand is statically empty, return false
065:
066:                if (operand0 == EmptySequence.getInstance()
067:                        || operand1 == EmptySequence.getInstance()) {
068:                    return BooleanValue.FALSE;
069:                }
070:
071:                // Neither operand needs to be sorted
072:
073:                Optimizer opt = env.getConfiguration().getOptimizer();
074:                operand0 = ExpressionTool.unsorted(opt, operand0, false);
075:                operand1 = ExpressionTool.unsorted(opt, operand1, false);
076:
077:                SequenceType atomicType = SequenceType.ATOMIC_SEQUENCE;
078:
079:                RoleLocator role0 = new RoleLocator(RoleLocator.BINARY_EXPR,
080:                        Token.tokens[operator], 0, null);
081:                role0.setSourceLocator(this );
082:                operand0 = TypeChecker.staticTypeCheck(operand0, atomicType,
083:                        false, role0, env);
084:
085:                RoleLocator role1 = new RoleLocator(RoleLocator.BINARY_EXPR,
086:                        Token.tokens[operator], 1, null);
087:                role1.setSourceLocator(this );
088:                operand1 = TypeChecker.staticTypeCheck(operand1, atomicType,
089:                        false, role1, env);
090:
091:                ItemType t0 = operand0.getItemType(th);
092:                ItemType t1 = operand1.getItemType(th);
093:
094:                int c0 = operand0.getCardinality();
095:                int c1 = operand1.getCardinality();
096:
097:                if (c0 == StaticProperty.EMPTY || c1 == StaticProperty.EMPTY) {
098:                    return BooleanValue.FALSE;
099:                }
100:
101:                if (t0 == Type.ANY_ATOMIC_TYPE
102:                        || t0 == Type.UNTYPED_ATOMIC_TYPE
103:                        || t1 == Type.ANY_ATOMIC_TYPE
104:                        || t1 == Type.UNTYPED_ATOMIC_TYPE) {
105:                    // then no static type checking is possible
106:                } else {
107:                    int pt0 = t0.getPrimitiveType();
108:                    int pt1 = t1.getPrimitiveType();
109:                    if (!Type.isComparable(pt0, pt1)) {
110:                        StaticError err = new StaticError("Cannot compare "
111:                                + t0.toString(env.getNamePool()) + " to "
112:                                + t1.toString(env.getNamePool()));
113:                        err.setErrorCode("XPTY0004");
114:                        err.setIsTypeError(true);
115:                        throw err;
116:                    }
117:                }
118:
119:                if (c0 == StaticProperty.EXACTLY_ONE
120:                        && c1 == StaticProperty.EXACTLY_ONE
121:                        && t0 != Type.ANY_ATOMIC_TYPE
122:                        && t1 != Type.ANY_ATOMIC_TYPE) {
123:
124:                    // Use a value comparison if both arguments are singletons, and if the comparison operator to
125:                    // be used can be determined.
126:
127:                    Expression e0 = operand0;
128:                    Expression e1 = operand1;
129:
130:                    if (t0 == Type.UNTYPED_ATOMIC_TYPE) {
131:                        if (t1 == Type.UNTYPED_ATOMIC_TYPE) {
132:                            e0 = new CastExpression(operand0, Type.STRING_TYPE,
133:                                    false);
134:                            adoptChildExpression(e0);
135:                            e1 = new CastExpression(operand1, Type.STRING_TYPE,
136:                                    false);
137:                            adoptChildExpression(e1);
138:                        } else if (th.isSubType(t1, Type.NUMBER_TYPE)) {
139:                            e0 = new CastExpression(operand0, Type.DOUBLE_TYPE,
140:                                    false);
141:                            adoptChildExpression(e0);
142:                        } else {
143:                            e0 = new CastExpression(operand0, (AtomicType) t1,
144:                                    false);
145:                            adoptChildExpression(e0);
146:                        }
147:                    } else if (t1 == Type.UNTYPED_ATOMIC_TYPE) {
148:                        if (th.isSubType(t0, Type.NUMBER_TYPE)) {
149:                            e1 = new CastExpression(operand1, Type.DOUBLE_TYPE,
150:                                    false);
151:                            adoptChildExpression(e1);
152:                        } else {
153:                            e1 = new CastExpression(operand1, (AtomicType) t0,
154:                                    false);
155:                            adoptChildExpression(e1);
156:                        }
157:                    }
158:
159:                    ValueComparison vc = new ValueComparison(e0,
160:                            singletonOperator, e1);
161:                    ExpressionTool.copyLocationInfo(this , vc);
162:                    vc.setParentExpression(getParentExpression());
163:                    return vc.simplify(env).typeCheck(env, contextItemType);
164:                }
165:
166:                Comparator comp = env.getCollation(env
167:                        .getDefaultCollationName());
168:                if (comp == null) {
169:                    comp = CodepointCollator.getInstance();
170:                }
171:                comparer = new AtomicComparer(comp, env.getConfiguration());
172:
173:                // evaluate the expression now if both arguments are constant
174:
175:                if ((operand0 instanceof  Value) && (operand1 instanceof  Value)) {
176:                    return (AtomicValue) evaluateItem(env
177:                            .makeEarlyEvaluationContext());
178:                }
179:
180:                return this ;
181:            }
182:
183:            private static Expression makeMinOrMax(Expression exp,
184:                    StaticContext env, String function) {
185:                FunctionCall fn = SystemFunction.makeSystemFunction(function,
186:                        1, env.getNamePool());
187:                Expression[] args = { exp };
188:                fn.setArguments(args);
189:                ((Minimax) fn).setIgnoreNaN(true);
190:                return fn;
191:            }
192:
193:            /**
194:             * Optimize the expression
195:             *
196:             * @return the checked expression
197:             */
198:
199:            public Expression optimize(Optimizer opt, StaticContext env,
200:                    ItemType contextItemType) throws XPathException {
201:
202:                final TypeHierarchy th = env.getNamePool().getTypeHierarchy();
203:
204:                operand0 = operand0.optimize(opt, env, contextItemType);
205:                operand1 = operand1.optimize(opt, env, contextItemType);
206:
207:                // If either operand is statically empty, return false
208:
209:                if (operand0 == EmptySequence.getInstance()
210:                        || operand1 == EmptySequence.getInstance()) {
211:                    return BooleanValue.FALSE;
212:                }
213:
214:                // Neither operand needs to be sorted
215:
216:                operand0 = ExpressionTool.unsorted(opt, operand0, false);
217:                operand1 = ExpressionTool.unsorted(opt, operand1, false);
218:
219:                ItemType t0 = operand0.getItemType(th);
220:                ItemType t1 = operand1.getItemType(th);
221:
222:                int c0 = operand0.getCardinality();
223:                int c1 = operand1.getCardinality();
224:
225:                // Check if neither argument allows a sequence of >1
226:
227:                if (!Cardinality.allowsMany(c0) && !Cardinality.allowsMany(c1)) {
228:
229:                    // Use a singleton comparison if both arguments are singletons
230:
231:                    SingletonComparison sc = new SingletonComparison(operand0,
232:                            singletonOperator, operand1);
233:                    ExpressionTool.copyLocationInfo(this , sc);
234:                    sc.setParentExpression(getParentExpression());
235:                    sc
236:                            .setComparator(comparer, env
237:                                    .makeEarlyEvaluationContext());
238:                    return sc.optimize(opt, env, contextItemType);
239:                }
240:
241:                // see if second argument is a singleton...
242:
243:                if (!Cardinality.allowsMany(c0)) {
244:
245:                    // if first argument is a singleton, reverse the arguments
246:                    GeneralComparison mc = getInverseComparison();
247:                    ExpressionTool.copyLocationInfo(this , mc);
248:                    mc.setParentExpression(getParentExpression());
249:                    mc.comparer = comparer;
250:                    return mc.optimize(opt, env, contextItemType);
251:                }
252:
253:                if (c0 == StaticProperty.EXACTLY_ONE
254:                        && c1 == StaticProperty.EXACTLY_ONE
255:                        && t0 != Type.ANY_ATOMIC_TYPE
256:                        && t1 != Type.ANY_ATOMIC_TYPE) {
257:
258:                    // Use a value comparison if both arguments are singletons, and if the comparison operator to
259:                    // be used can be determined.
260:
261:                    Expression e0 = operand0;
262:                    Expression e1 = operand1;
263:
264:                    if (t0 == Type.UNTYPED_ATOMIC_TYPE) {
265:                        if (t1 == Type.UNTYPED_ATOMIC_TYPE) {
266:                            e0 = new CastExpression(operand0, Type.STRING_TYPE,
267:                                    false);
268:                            adoptChildExpression(e0);
269:                            e1 = new CastExpression(operand1, Type.STRING_TYPE,
270:                                    false);
271:                            adoptChildExpression(e1);
272:                        } else if (th.isSubType(t1, Type.NUMBER_TYPE)) {
273:                            e0 = new CastExpression(operand0, Type.DOUBLE_TYPE,
274:                                    false);
275:                            adoptChildExpression(e0);
276:                        } else {
277:                            e0 = new CastExpression(operand0, (AtomicType) t1,
278:                                    false);
279:                            adoptChildExpression(e0);
280:                        }
281:                    } else if (t1 == Type.UNTYPED_ATOMIC_TYPE) {
282:                        if (th.isSubType(t0, Type.NUMBER_TYPE)) {
283:                            e1 = new CastExpression(operand1, Type.DOUBLE_TYPE,
284:                                    false);
285:                            adoptChildExpression(e1);
286:                        } else {
287:                            e1 = new CastExpression(operand1, (AtomicType) t0,
288:                                    false);
289:                            adoptChildExpression(e1);
290:                        }
291:                    }
292:
293:                    ValueComparison vc = new ValueComparison(e0,
294:                            singletonOperator, e1);
295:                    ExpressionTool.copyLocationInfo(this , vc);
296:                    vc.setParentExpression(getParentExpression());
297:                    return vc.simplify(env).typeCheck(env, contextItemType)
298:                            .optimize(opt, env, contextItemType);
299:                }
300:
301:                Comparator comp = env.getCollation(env
302:                        .getDefaultCollationName());
303:                if (comp == null) {
304:                    comp = CodepointCollator.getInstance();
305:                }
306:                comparer = new AtomicComparer(comp, env.getConfiguration());
307:
308:                // If the operator is gt, ge, lt, le then replace X < Y by min(X) < max(Y) or
309:                // by (some $x in X satisfies $x lt Y)
310:
311:                // This optimization is done only in the case where at least one of the
312:                // sequences is known to be purely numeric. It isn't safe if both sequences
313:                // contain untyped atomic values, because in that case, the type of the
314:                // comparison isn't known in advance. For example [(1, U1) < ("fred", U2)]
315:                // involves both string and numeric comparisons.
316:
317:                if (operator != Token.EQUALS
318:                        && operator != Token.NE
319:                        && (th.isSubType(t0, Type.NUMBER_TYPE) || th.isSubType(
320:                                t1, Type.NUMBER_TYPE))) {
321:
322:                    Expression e0 = operand0;
323:                    if (!th.isSubType(t0, Type.NUMBER_TYPE)) {
324:                        RoleLocator role = new RoleLocator(
325:                                RoleLocator.BINARY_EXPR,
326:                                Token.tokens[operator], 0, null);
327:                        role.setSourceLocator(this );
328:                        e0 = TypeChecker
329:                                .staticTypeCheck(e0,
330:                                        SequenceType.NUMERIC_SEQUENCE, false,
331:                                        role, env);
332:                    }
333:                    Expression e1 = operand1;
334:                    if (!th.isSubType(t1, Type.NUMBER_TYPE)) {
335:                        RoleLocator role = new RoleLocator(
336:                                RoleLocator.BINARY_EXPR,
337:                                Token.tokens[operator], 1, null);
338:                        role.setSourceLocator(this );
339:                        e1 = TypeChecker
340:                                .staticTypeCheck(e1,
341:                                        SequenceType.NUMERIC_SEQUENCE, false,
342:                                        role, env);
343:                    }
344:
345:                    if (c1 == StaticProperty.EXACTLY_ONE) {
346:
347:                        // If second operand is a singleton, rewrite as
348:                        //      some $x in E0 satisfies $x op E1
349:
350:                        // System.err.println("** using quantified optimization R **");
351:                        RangeVariableDeclaration decl = new RangeVariableDeclaration();
352:                        decl.setVariableName("qq:" + decl.hashCode());
353:                        SequenceType type = SequenceType.makeSequenceType(e0
354:                                .getItemType(th), StaticProperty.EXACTLY_ONE);
355:                        decl.setRequiredType(type);
356:
357:                        VariableReference var = new VariableReference(decl);
358:                        ValueComparison vc = new ValueComparison(var,
359:                                singletonOperator, e1);
360:                        QuantifiedExpression qe = new QuantifiedExpression();
361:                        qe.setOperator(Token.SOME);
362:                        qe.setVariableDeclaration(decl);
363:                        qe.setSequence(e0);
364:                        qe.setAction(vc);
365:                        qe.setParentExpression(getParentExpression());
366:                        return qe.typeCheck(env, contextItemType);
367:
368:                    } else {
369:
370:                        // If neither operand is known to be a singleton, rewrite as (for example)
371:                        // min(E0) op max(E1)
372:
373:                        // System.err.println("** using minimax optimization **");
374:                        ValueComparison vc;
375:                        switch (operator) {
376:                        case Token.LT:
377:                        case Token.LE:
378:                            vc = new ValueComparison(makeMinOrMax(e0, env,
379:                                    "min"), singletonOperator, makeMinOrMax(e1,
380:                                    env, "max"));
381:                            break;
382:                        case Token.GT:
383:                        case Token.GE:
384:                            vc = new ValueComparison(makeMinOrMax(e0, env,
385:                                    "max"), singletonOperator, makeMinOrMax(e1,
386:                                    env, "min"));
387:                            break;
388:                        default:
389:                            throw new UnsupportedOperationException(
390:                                    "Unknown operator " + operator);
391:                        }
392:
393:                        ExpressionTool.copyLocationInfo(this , vc);
394:                        vc.setParentExpression(getParentExpression());
395:                        return vc.typeCheck(env, contextItemType);
396:                    }
397:                }
398:
399:                // look for (N to M = I)
400:
401:                if (operand0 instanceof  RangeExpression
402:                        && th.isSubType(operand1.getItemType(th),
403:                                Type.INTEGER_TYPE)
404:                        && !Cardinality.allowsMany(operand1.getCardinality())) {
405:                    Expression min = ((RangeExpression) operand0).operand0;
406:                    Expression max = ((RangeExpression) operand0).operand1;
407:                    if (operand1 instanceof  Position) {
408:                        PositionRange pr = new PositionRange(min, max);
409:                        ExpressionTool.copyLocationInfo(this , pr);
410:                        pr.setParentExpression(getParentExpression());
411:                        return pr;
412:                    } else {
413:                        IntegerRangeTest ir = new IntegerRangeTest(operand1,
414:                                min, max);
415:                        ExpressionTool.copyLocationInfo(this , ir);
416:                        ir.setParentExpression(getParentExpression());
417:                        return ir;
418:                    }
419:                }
420:
421:                if (operand0 instanceof  IntegerRange
422:                        && th.isSubType(operand1.getItemType(th),
423:                                Type.INTEGER_TYPE)
424:                        && !Cardinality.allowsMany(operand1.getCardinality())) {
425:                    long min = ((IntegerRange) operand0).getStart();
426:                    long max = ((IntegerRange) operand0).getEnd();
427:                    if (operand1 instanceof  Position) {
428:                        PositionRange pr = new PositionRange(new IntegerValue(
429:                                min), new IntegerValue(max));
430:                        ExpressionTool.copyLocationInfo(this , pr);
431:                        pr.setParentExpression(getParentExpression());
432:                        return pr;
433:                    } else {
434:                        IntegerRangeTest ir = new IntegerRangeTest(operand1,
435:                                new IntegerValue(min), new IntegerValue(max));
436:                        ExpressionTool.copyLocationInfo(this , ir);
437:                        ir.setParentExpression(getParentExpression());
438:                        return ir;
439:                    }
440:                }
441:
442:                // evaluate the expression now if both arguments are constant
443:
444:                if ((operand0 instanceof  Value) && (operand1 instanceof  Value)) {
445:                    return (AtomicValue) evaluateItem(env
446:                            .makeEarlyEvaluationContext());
447:                }
448:
449:                return this ;
450:            }
451:
452:            /**
453:             * Evaluate the expression in a given context
454:             *
455:             * @param context the given context for evaluation
456:             * @return a BooleanValue representing the result of the numeric comparison of the two operands
457:             */
458:
459:            public Item evaluateItem(XPathContext context)
460:                    throws XPathException {
461:                return BooleanValue.get(effectiveBooleanValue(context));
462:            }
463:
464:            /**
465:             * Evaluate the expression in a boolean context
466:             *
467:             * @param context the given context for evaluation
468:             * @return a boolean representing the result of the numeric comparison of the two operands
469:             */
470:
471:            public boolean effectiveBooleanValue(XPathContext context)
472:                    throws XPathException {
473:
474:                try {
475:                    SequenceIterator iter1 = operand0.iterate(context);
476:                    SequenceIterator iter2 = operand1.iterate(context);
477:
478:                    Value seq2 = SequenceExtent.makeSequenceExtent(iter2);
479:                    // we choose seq2 because it's more likely to be a singleton
480:                    int count2 = seq2.getLength();
481:
482:                    if (count2 == 0) {
483:                        return false;
484:                    }
485:
486:                    if (count2 == 1) {
487:                        AtomicValue s2 = (AtomicValue) seq2.itemAt(0);
488:                        while (true) {
489:                            AtomicValue s1 = (AtomicValue) iter1.next();
490:                            if (s1 == null) {
491:                                break;
492:                            }
493:                            if (compare(s1, singletonOperator, s2, comparer,
494:                                    context)) {
495:                                return true;
496:                            }
497:                        }
498:                        return false;
499:                    }
500:
501:                    while (true) {
502:                        AtomicValue s1 = (AtomicValue) iter1.next();
503:                        if (s1 == null) {
504:                            break;
505:                        }
506:                        SequenceIterator e2 = seq2.iterate(null);
507:                        while (true) {
508:                            AtomicValue s2 = (AtomicValue) e2.next();
509:                            if (s2 == null) {
510:                                break;
511:                            }
512:                            if (compare(s1, singletonOperator, s2, comparer,
513:                                    context)) {
514:                                return true;
515:                            }
516:                        }
517:                    }
518:
519:                    return false;
520:                } catch (DynamicError e) {
521:                    // re-throw the exception with location information added
522:                    if (e.getXPathContext() == null) {
523:                        e.setXPathContext(context);
524:                    }
525:                    if (e.getLocator() == null) {
526:                        e.setLocator(this );
527:                    }
528:                    throw e;
529:                } catch (ValidationException e) {
530:                    DynamicError err = new DynamicError(e);
531:                    err.setXPathContext(context);
532:                    if (e.getLineNumber() == -1) {
533:                        err.setLocator(this );
534:                    } else {
535:                        err.setLocator(e);
536:                    }
537:                    err.setErrorCode(e.getErrorCodeLocalPart());
538:                    throw err;
539:                }
540:
541:            }
542:
543:            /**
544:             * Compare two atomic values
545:             */
546:
547:            protected static boolean compare(AtomicValue a1, int operator,
548:                    AtomicValue a2, AtomicComparer comparer,
549:                    XPathContext context) throws XPathException {
550:
551:                AtomicValue v1 = a1;
552:                AtomicValue v2 = a2;
553:                if (a1 instanceof  UntypedAtomicValue) {
554:                    if (a2 instanceof  NumericValue) {
555:                        v1 = a1.convert(Type.DOUBLE, context);
556:                    } else if (a2 instanceof  UntypedAtomicValue) {
557:                        // the spec says convert it to a string, but this doesn't affect the outcome
558:                    } else {
559:                        final TypeHierarchy th = context.getNamePool()
560:                                .getTypeHierarchy();
561:                        v1 = a1.convert(a2.getItemType(th).getPrimitiveType(),
562:                                context);
563:                    }
564:                }
565:                if (a2 instanceof  UntypedAtomicValue) {
566:                    if (a1 instanceof  NumericValue) {
567:                        v2 = a2.convert(Type.DOUBLE, context);
568:                    } else if (a1 instanceof  UntypedAtomicValue) {
569:                        // the spec says convert it to a string, but this doesn't affect the outcome
570:                    } else {
571:                        final TypeHierarchy th = context.getNamePool()
572:                                .getTypeHierarchy();
573:                        v2 = a2.convert(a1.getItemType(th).getPrimitiveType(),
574:                                context);
575:                    }
576:                }
577:                return ValueComparison.compare(v1, operator, v2, comparer);
578:
579:            }
580:
581:            /**
582:             * Determine the data type of the expression
583:             *
584:             * @return Type.BOOLEAN
585:             * @param th
586:             */
587:
588:            public ItemType getItemType(TypeHierarchy th) {
589:                return Type.BOOLEAN_TYPE;
590:            }
591:
592:            /**
593:             * Return the singleton form of the comparison operator, e.g. FEQ for EQUALS, FGT for GT
594:             */
595:
596:            private static int getSingletonOperator(int op) {
597:                switch (op) {
598:                case Token.EQUALS:
599:                    return Token.FEQ;
600:                case Token.GE:
601:                    return Token.FGE;
602:                case Token.NE:
603:                    return Token.FNE;
604:                case Token.LT:
605:                    return Token.FLT;
606:                case Token.GT:
607:                    return Token.FGT;
608:                case Token.LE:
609:                    return Token.FLE;
610:                default:
611:                    return op;
612:                }
613:            }
614:
615:            protected GeneralComparison getInverseComparison() {
616:                return new GeneralComparison(operand1, Token.inverse(operator),
617:                        operand0);
618:            }
619:
620:            protected String displayOperator() {
621:                return "many-to-many " + super .displayOperator();
622:            }
623:
624:        }
625:
626:        //
627:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
628:        // you may not use this file except in compliance with the License. You may obtain a copy of the
629:        // License at http://www.mozilla.org/MPL/
630:        //
631:        // Software distributed under the License is distributed on an "AS IS" basis,
632:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
633:        // See the License for the specific language governing rights and limitations under the License.
634:        //
635:        // The Original Code is: all this file.
636:        //
637:        // The Initial Developer of the Original Code is Michael H. Kay.
638:        //
639:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
640:        //
641:        // Contributor(s): none.
642:        //
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