Source Code Cross Referenced for ValueComparison.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.functions.*;
004:        import net.sf.saxon.om.Item;
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.AtomicType;
011:        import net.sf.saxon.type.ItemType;
012:        import net.sf.saxon.type.Type;
013:        import net.sf.saxon.type.TypeHierarchy;
014:        import net.sf.saxon.value.*;
015:
016:        import java.util.Comparator;
017:
018:        /**
019:         * ValueComparison: a boolean expression that compares two atomic values
020:         * for equals, not-equals, greater-than or less-than. Implements the operators
021:         * eq, ne, lt, le, gt, ge
022:         */
023:
024:        public final class ValueComparison extends BinaryExpression {
025:
026:            private AtomicComparer comparer;
027:
028:            /**
029:             * Create a relational expression identifying the two operands and the operator
030:             * @param p1 the left-hand operand
031:             * @param op the operator, as a token returned by the Tokenizer (e.g. Token.LT)
032:             * @param p2 the right-hand operand
033:             */
034:
035:            public ValueComparison(Expression p1, int op, Expression p2) {
036:                super (p1, op, p2);
037:            }
038:
039:            /**
040:             * Type-check the expression
041:             */
042:
043:            public Expression typeCheck(StaticContext env,
044:                    ItemType contextItemType) throws XPathException {
045:
046:                operand0 = operand0.typeCheck(env, contextItemType);
047:                if (operand0 instanceof  EmptySequence) {
048:                    return operand0;
049:                }
050:                operand1 = operand1.typeCheck(env, contextItemType);
051:                if (operand1 instanceof  EmptySequence) {
052:                    return operand1;
053:                }
054:
055:                final SequenceType optionalAtomic = SequenceType.OPTIONAL_ATOMIC;
056:                final TypeHierarchy th = env.getNamePool().getTypeHierarchy();
057:
058:                RoleLocator role0 = new RoleLocator(RoleLocator.BINARY_EXPR,
059:                        Token.tokens[operator], 0, null);
060:                role0.setSourceLocator(this );
061:                operand0 = TypeChecker.staticTypeCheck(operand0,
062:                        optionalAtomic, false, role0, env);
063:
064:                RoleLocator role1 = new RoleLocator(RoleLocator.BINARY_EXPR,
065:                        Token.tokens[operator], 1, null);
066:                role1.setSourceLocator(this );
067:                operand1 = TypeChecker.staticTypeCheck(operand1,
068:                        optionalAtomic, false, role1, env);
069:
070:                AtomicType t1 = operand0.getItemType(th).getAtomizedItemType();
071:                AtomicType t2 = operand1.getItemType(th).getAtomizedItemType();
072:
073:                int p1 = t1.getPrimitiveType();
074:                if (p1 == Type.UNTYPED_ATOMIC) {
075:                    p1 = Type.STRING;
076:                }
077:                int p2 = t2.getPrimitiveType();
078:                if (p2 == Type.UNTYPED_ATOMIC) {
079:                    p2 = Type.STRING;
080:                }
081:
082:                if (!Type.isComparable(p1, p2)) {
083:                    boolean opt0 = Cardinality.allowsZero(operand0
084:                            .getCardinality());
085:                    boolean opt1 = Cardinality.allowsZero(operand1
086:                            .getCardinality());
087:                    if (opt0 || opt1) {
088:                        // This is a comparison such as (xs:integer? eq xs:date?). This is almost
089:                        // certainly an error, but we need to let it through because it will work if
090:                        // one of the operands is an empty sequence.
091:
092:                        String which = null;
093:                        if (opt0)
094:                            which = "the first operand is";
095:                        if (opt1)
096:                            which = "the second operand is";
097:                        if (opt0 && opt1)
098:                            which = "one or both operands are";
099:                        env.issueWarning("Comparison of "
100:                                + t1.toString(env.getNamePool())
101:                                + (opt0 ? "?" : "") + " to "
102:                                + t2.toString(env.getNamePool())
103:                                + (opt1 ? "?" : "") + " will fail unless "
104:                                + which + " empty", this );
105:
106:                    } else {
107:                        StaticError err = new StaticError("Cannot compare "
108:                                + t1.toString(env.getNamePool()) + " to "
109:                                + t2.toString(env.getNamePool()));
110:                        err.setIsTypeError(true);
111:                        err.setErrorCode("XPTY0004");
112:                        throw err;
113:                    }
114:                }
115:                if (!(operator == Token.FEQ || operator == Token.FNE)) {
116:                    if (!Type.isOrdered(p1)) {
117:                        StaticError err = new StaticError("Type "
118:                                + t1.toString(env.getNamePool())
119:                                + " is not an ordered type");
120:                        err.setErrorCode("XPTY0004");
121:                        err.setIsTypeError(true);
122:                        throw err;
123:                    }
124:                    if (!Type.isOrdered(p2)) {
125:                        StaticError err = new StaticError("Type "
126:                                + t2.toString(env.getNamePool())
127:                                + " is not an ordered type");
128:                        err.setErrorCode("XPTY0004");
129:                        err.setIsTypeError(true);
130:                        throw err;
131:                    }
132:                }
133:
134:                Comparator comp = env.getCollation(env
135:                        .getDefaultCollationName());
136:                if (comp == null)
137:                    comp = CodepointCollator.getInstance();
138:                comparer = new AtomicComparer(comp, env.getConfiguration());
139:                return this ;
140:            }
141:
142:            /**
143:             * Perform optimisation of an expression and its subexpressions.
144:             * <p/>
145:             * <p>This method is called after all references to functions and variables have been resolved
146:             * to the declaration of the function or variable, and after all type checking has been done.</p>
147:             *
148:             * @param opt             the optimizer in use. This provides access to supporting functions; it also allows
149:             *                        different optimization strategies to be used in different circumstances.
150:             * @param env             the static context of the expression
151:             * @param contextItemType the static type of "." at the point where this expression is invoked.
152:             *                        The parameter is set to null if it is known statically that the context item will be undefined.
153:             *                        If the type of the context item is not known statically, the argument is set to
154:             *                        {@link net.sf.saxon.type.Type#ITEM_TYPE}
155:             * @return the original expression, rewritten if appropriate to optimize execution
156:             * @throws net.sf.saxon.trans.StaticError if an error is discovered during this phase
157:             *                                        (typically a type error)
158:             */
159:
160:            public Expression optimize(Optimizer opt, StaticContext env,
161:                    ItemType contextItemType) throws XPathException {
162:
163:                operand0 = operand0.optimize(opt, env, contextItemType);
164:                operand1 = operand1.optimize(opt, env, contextItemType);
165:                // optimise count(x) eq 0 (or gt 0, ne 0, eq 0, etc)
166:
167:                if (Aggregate.isCountFunction(operand0)
168:                        && operand1 instanceof  AtomicValue) {
169:                    if (isZero(operand1)) {
170:                        if (operator == Token.FEQ || operator == Token.FLE) {
171:                            // rewrite count(x)=0 as empty(x)
172:                            FunctionCall fn = SystemFunction
173:                                    .makeSystemFunction("empty", 1, env
174:                                            .getNamePool());
175:                            Expression[] args = new Expression[1];
176:                            args[0] = ((FunctionCall) operand0).argument[0];
177:                            fn.setArguments(args);
178:                            return fn;
179:                        } else if (operator == Token.FNE
180:                                || operator == Token.FGT) {
181:                            // rewrite count(x)!=0, count(x)>0 as exists(x)
182:                            FunctionCall fn = SystemFunction
183:                                    .makeSystemFunction("exists", 1, env
184:                                            .getNamePool());
185:                            Expression[] args = new Expression[1];
186:                            args[0] = ExpressionTool.unsorted(opt,
187:                                    ((FunctionCall) operand0).argument[0],
188:                                    false);
189:                            fn.setArguments(args);
190:                            return fn;
191:                        } else if (operator == Token.FGE) {
192:                            // rewrite count(x)>=0 as true()
193:                            return BooleanValue.TRUE;
194:                        } else { // singletonOperator == Token.FLT
195:                            // rewrite count(x)<0 as false()
196:                            return BooleanValue.FALSE;
197:                        }
198:                    } else if (operand1 instanceof  IntegerValue
199:                            && (operator == Token.FGT || operator == Token.FGE)) {
200:                        // rewrite count(x) gt n as exists(x[n+1])
201:                        //     and count(x) ge n as exists(x[n])
202:                        long val = ((IntegerValue) operand1).longValue();
203:                        if (operator == Token.FGT) {
204:                            val++;
205:                        }
206:                        FunctionCall fn = SystemFunction.makeSystemFunction(
207:                                "exists", 1, env.getNamePool());
208:                        Expression[] args = new Expression[1];
209:                        FilterExpression filter = new FilterExpression(
210:                                ((FunctionCall) operand0).argument[0],
211:                                new IntegerValue(val), env);
212:                        args[0] = filter;
213:                        fn.setArguments(args);
214:                        return fn;
215:                    }
216:                }
217:
218:                // optimise (0 eq count(x)), etc
219:
220:                if (Aggregate.isCountFunction(operand1) && isZero(operand0)) {
221:                    Expression s = new ValueComparison(operand1, Token
222:                            .inverse(operator), operand0).typeCheck(env,
223:                            contextItemType);
224:                    //((ValueComparison)s).defaultCollation = defaultCollation;
225:                    return s.optimize(opt, env, contextItemType);
226:                }
227:
228:                // optimise string-length(x) = 0, >0, !=0 etc
229:
230:                if ((operand0 instanceof  StringLength)
231:                        && (((StringLength) operand0).getNumberOfArguments() == 1)
232:                        && isZero(operand1)) {
233:                    ((StringLength) operand0).setShortcut();
234:                }
235:
236:                // optimise (0 = string-length(x)), etc
237:
238:                if ((operand1 instanceof  StringLength)
239:                        && (((StringLength) operand1).getNumberOfArguments() == 1)
240:                        && isZero(operand0)) {
241:                    ((StringLength) operand1).setShortcut();
242:                }
243:
244:                // optimise [position()=last()] etc
245:
246:                if ((operand0 instanceof  Position)
247:                        && (operand1 instanceof  Last)) {
248:                    switch (operator) {
249:                    case Token.FEQ:
250:                    case Token.FGE:
251:                        return new IsLastExpression(true);
252:                    case Token.FNE:
253:                    case Token.FLT:
254:                        return new IsLastExpression(false);
255:                    case Token.FGT:
256:                        return BooleanValue.FALSE;
257:                    case Token.FLE:
258:                        return BooleanValue.TRUE;
259:                    }
260:                }
261:                if ((operand0 instanceof  Last)
262:                        && (operand1 instanceof  Position)) {
263:                    switch (operator) {
264:                    case Token.FEQ:
265:                    case Token.FLE:
266:                        return new IsLastExpression(true);
267:                    case Token.FNE:
268:                    case Token.FGT:
269:                        return new IsLastExpression(false);
270:                    case Token.FLT:
271:                        return BooleanValue.FALSE;
272:                    case Token.FGE:
273:                        return BooleanValue.TRUE;
274:                    }
275:                }
276:
277:                // optimise [position() < n] etc
278:
279:                if (operand0 instanceof  Position) {
280:                    boolean isInteger = (operand1 instanceof  IntegerValue);
281:                    int pos = 0;
282:                    if (isInteger) {
283:                        pos = (int) ((IntegerValue) operand1).longValue();
284:                        if (pos < 0) {
285:                            pos = 0;
286:                        }
287:                    }
288:                    switch (operator) {
289:                    case Token.FEQ:
290:                        return new PositionRange(operand1, operand1);
291:                    case Token.FGE:
292:                        return new PositionRange(operand1, null);
293:                    case Token.FNE:
294:                        if (isInteger && pos == 1) {
295:                            return new PositionRange(2, Integer.MAX_VALUE);
296:                        } else {
297:                            break;
298:                        }
299:                    case Token.FLT:
300:                        if (isInteger) {
301:                            return new PositionRange(1, pos - 1);
302:                        } else {
303:                            break;
304:                        }
305:                    case Token.FGT:
306:                        if (isInteger) {
307:                            return new PositionRange(pos + 1, Integer.MAX_VALUE);
308:                        } else {
309:                            break;
310:                        }
311:                    case Token.FLE:
312:                        if (isInteger) {
313:                            return new PositionRange(1, pos);
314:                        } else {
315:                            break;
316:                        }
317:                    }
318:                }
319:
320:                if (operand1 instanceof  Position) {
321:                    int pos = 0;
322:                    boolean isInteger = (operand0 instanceof  IntegerValue);
323:                    if (isInteger) {
324:                        pos = (int) ((IntegerValue) operand0).longValue();
325:                        if (pos < 0) {
326:                            pos = 0;
327:                        }
328:                    }
329:
330:                    switch (operator) {
331:                    case Token.FEQ:
332:                        return new PositionRange(operand0, operand0);
333:                    case Token.FLE:
334:                        return new PositionRange(operand0, null);
335:                    case Token.FNE:
336:                        if (isInteger && pos == 1) {
337:                            return new PositionRange(2, Integer.MAX_VALUE);
338:                        } else {
339:                            break;
340:                        }
341:                    case Token.FGT:
342:                        if (isInteger) {
343:                            return new PositionRange(1, pos - 1);
344:                        } else {
345:                            break;
346:                        }
347:                    case Token.FLT:
348:                        if (isInteger) {
349:                            return new PositionRange(pos + 1, Integer.MAX_VALUE);
350:                        } else {
351:                            break;
352:                        }
353:                    case Token.FGE:
354:                        if (isInteger) {
355:                            return new PositionRange(1, pos);
356:                        } else {
357:                            break;
358:                        }
359:                    }
360:                }
361:
362:                // optimize generate-id(X) = generate-id(Y) as "X is Y"
363:                // This construct is often used in XSLT 1.0 stylesheets.
364:                // Only do this if we know the arguments are singletons, because "is" doesn't
365:                // do first-value extraction.
366:
367:                if (NamePart.isGenerateIdFunction(operand0)
368:                        && NamePart.isGenerateIdFunction(operand1)) {
369:                    FunctionCall f0 = (FunctionCall) operand0;
370:                    FunctionCall f1 = (FunctionCall) operand1;
371:                    if (!Cardinality
372:                            .allowsMany(f0.argument[0].getCardinality())
373:                            && !Cardinality.allowsMany(f1.argument[0]
374:                                    .getCardinality())
375:                            && (operator == Token.FEQ)) {
376:                        IdentityComparison id = new IdentityComparison(
377:                                f0.argument[0], Token.IS, f1.argument[0]);
378:                        id.setGenerateIdEmulation(true);
379:                        return id.simplify(env).typeCheck(env, contextItemType)
380:                                .optimize(opt, env, contextItemType);
381:                    }
382:                }
383:
384:                // evaluate the expression now if both arguments are constant
385:
386:                if ((operand0 instanceof  Value) && (operand1 instanceof  Value)) {
387:                    return (AtomicValue) evaluateItem(env
388:                            .makeEarlyEvaluationContext());
389:                }
390:
391:                return this ;
392:            }
393:
394:            /**
395:             * Return the negation of this value comparison: that is, a value comparison that returns true()
396:             * if and only if the original returns false()
397:             */
398:
399:            public ValueComparison negate() {
400:                ValueComparison vc = new ValueComparison(operand0, Token
401:                        .negate(operator), operand1);
402:                vc.comparer = comparer;
403:                return vc;
404:            }
405:
406:            /**
407:             * Test whether an expression is constant zero
408:             */
409:
410:            private static boolean isZero(Expression exp) {
411:                try {
412:                    if (!(exp instanceof  AtomicValue))
413:                        return false;
414:                    if (exp instanceof  IntegerValue) {
415:                        return ((IntegerValue) exp).longValue() == 0;
416:                    }
417:                    if (exp instanceof  BigIntegerValue) {
418:                        return ((BigIntegerValue) exp)
419:                                .compareTo(BigIntegerValue.ZERO) == 0;
420:                    }
421:
422:                    Value val = ((AtomicValue) exp).convert(Type.INTEGER, null);
423:                    return isZero(val);
424:                } catch (XPathException err) {
425:                    return false;
426:                }
427:            }
428:
429:            /**
430:             * Evaluate the expression in a boolean context
431:             * @param context the given context for evaluation
432:             * @return a boolean representing the result of the numeric comparison of the two operands
433:             */
434:
435:            public boolean effectiveBooleanValue(XPathContext context)
436:                    throws XPathException {
437:                try {
438:                    AtomicValue v1 = ((AtomicValue) operand0
439:                            .evaluateItem(context));
440:                    if (v1 == null)
441:                        return false;
442:                    if (v1 instanceof  UntypedAtomicValue) {
443:                        v1 = v1.convert(Type.STRING, context);
444:                    }
445:                    AtomicValue v2 = ((AtomicValue) operand1
446:                            .evaluateItem(context));
447:                    if (v2 == null)
448:                        return false;
449:                    if (v2 instanceof  UntypedAtomicValue) {
450:                        v2 = v2.convert(Type.STRING, context);
451:                    }
452:                    return compare(v1, operator, v2, comparer);
453:                } catch (DynamicError e) {
454:                    // re-throw the exception with location information added
455:                    if (e.getXPathContext() == null) {
456:                        e.setXPathContext(context);
457:                    }
458:                    if (e.getLocator() == null) {
459:                        e.setLocator(this );
460:                    }
461:                    throw e;
462:                }
463:            }
464:
465:            /**
466:             * Compare two atomic values, using a specified operator and collation
467:             * @param v1 the first operand
468:             * @param op the operator, as defined by constants such as {@link Token#FEQ} or
469:             * {@link Token#FLT}
470:             * @param v2 the second operand
471:             * @param collator the Collator to be used when comparing strings
472:             * @throws net.sf.saxon.trans.DynamicError if the values are not comparable
473:             */
474:
475:            static boolean compare(AtomicValue v1, int op, AtomicValue v2,
476:                    AtomicComparer collator) throws DynamicError {
477:                if (v1 instanceof  NumericValue && ((NumericValue) v1).isNaN()) {
478:                    return false;
479:                }
480:                if (v2 instanceof  NumericValue && ((NumericValue) v2).isNaN()) {
481:                    return false;
482:                }
483:                try {
484:                    switch (op) {
485:                    case Token.FEQ:
486:                        return collator.comparesEqual(v1, v2);
487:                    case Token.FNE:
488:                        return !collator.comparesEqual(v1, v2);
489:                    case Token.FGT:
490:                        return collator.compare(v1, v2) > 0;
491:                    case Token.FLT:
492:                        return collator.compare(v1, v2) < 0;
493:                    case Token.FGE:
494:                        return collator.compare(v1, v2) >= 0;
495:                    case Token.FLE:
496:                        return collator.compare(v1, v2) <= 0;
497:                    default:
498:                        throw new UnsupportedOperationException(
499:                                "Unknown operator " + op);
500:                    }
501:                } catch (ClassCastException err) {
502:                    DynamicError e2 = new DynamicError("Cannot compare "
503:                            + v1.getItemType(null) + " to "
504:                            + v2.getItemType(null));
505:                    e2.setErrorCode("XPTY0004");
506:                    e2.setIsTypeError(true);
507:                    throw e2;
508:                }
509:            }
510:
511:            /**
512:             * Evaluate the expression in a given context
513:             * @param context the given context for evaluation
514:             * @return a BooleanValue representing the result of the numeric comparison of the two operands,
515:             * or null representing the empty sequence
516:             */
517:
518:            public Item evaluateItem(XPathContext context)
519:                    throws XPathException {
520:                try {
521:                    AtomicValue v1 = (AtomicValue) operand0
522:                            .evaluateItem(context);
523:                    if (v1 == null)
524:                        return null;
525:                    if (v1 instanceof  UntypedAtomicValue) {
526:                        v1 = v1.convert(Type.STRING, context);
527:                    }
528:                    AtomicValue v2 = (AtomicValue) operand1
529:                            .evaluateItem(context);
530:                    if (v2 == null)
531:                        return null;
532:                    if (v2 instanceof  UntypedAtomicValue) {
533:                        v2 = v2.convert(Type.STRING, context);
534:                    }
535:                    return BooleanValue
536:                            .get(compare(v1, operator, v2, comparer));
537:                } catch (DynamicError e) {
538:                    // re-throw the exception with location information added
539:                    if (e.getXPathContext() == null) {
540:                        e.setXPathContext(context);
541:                    }
542:                    if (e.getLocator() == null) {
543:                        e.setLocator(this );
544:                    }
545:                    throw e;
546:                }
547:            }
548:
549:            /**
550:             * Determine the data type of the expression
551:             * @return Type.BOOLEAN
552:             * @param th
553:             */
554:
555:            public ItemType getItemType(TypeHierarchy th) {
556:                return Type.BOOLEAN_TYPE;
557:            }
558:
559:        }
560:
561:        //
562:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
563:        // you may not use this file except in compliance with the License. You may obtain a copy of the
564:        // License at http://www.mozilla.org/MPL/
565:        //
566:        // Software distributed under the License is distributed on an "AS IS" basis,
567:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
568:        // See the License for the specific language governing rights and limitations under the License.
569:        //
570:        // The Original Code is: all this file.
571:        //
572:        // The Initial Developer of the Original Code is Michael H. Kay.
573:        //
574:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
575:        //
576:        // Contributor(s): none.
577:        //
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