Source Code Cross Referenced for ArithmeticExpression.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) 


0001:        package net.sf.saxon.expr;
0002:
0003:        import net.sf.saxon.Err;
0004:        import net.sf.saxon.om.Item;
0005:        import net.sf.saxon.om.NamePool;
0006:        import net.sf.saxon.trans.DynamicError;
0007:        import net.sf.saxon.trans.StaticError;
0008:        import net.sf.saxon.trans.XPathException;
0009:        import net.sf.saxon.type.AtomicType;
0010:        import net.sf.saxon.type.ItemType;
0011:        import net.sf.saxon.type.Type;
0012:        import net.sf.saxon.type.TypeHierarchy;
0013:        import net.sf.saxon.value.*;
0014:
0015:        /**
0016:         * Arithmetic Expression: an expression using one of the operators
0017:         * plus, minus, multiply, div, idiv, mod.
0018:         */
0019:
0020:        class ArithmeticExpression extends BinaryExpression {
0021:
0022:            private static final class Signature {
0023:                ItemType operand0;
0024:                ItemType operand1;
0025:                int operation;
0026:                ItemType resultType;
0027:
0028:                Signature(ItemType t0, ItemType t1, int op, ItemType r) {
0029:                    operand0 = t0;
0030:                    operand1 = t1;
0031:                    operation = op;
0032:                    resultType = r;
0033:                }
0034:            }
0035:
0036:            private static final int NUMERIC_ARITHMETIC = 0;
0037:            private static final int DATE_AND_DURATION = 1;
0038:            private static final int DATE_DIFFERENCE = 2;
0039:            private static final int DURATION_ADDITION = 3;
0040:            private static final int DURATION_MULTIPLICATION = 4;
0041:            private static final int DURATION_DIVISION = 5;
0042:
0043:            private static final int UNKNOWN = -1;
0044:            private static final int UNKNOWN_10 = -2;
0045:
0046:            private static final Signature[] plusTable = {
0047:                    new Signature(Type.NUMBER_TYPE, Type.NUMBER_TYPE,
0048:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0049:                    new Signature(Type.NUMBER_TYPE, Type.UNTYPED_ATOMIC_TYPE,
0050:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0051:                    new Signature(Type.UNTYPED_ATOMIC_TYPE, Type.NUMBER_TYPE,
0052:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0053:                    new Signature(Type.UNTYPED_ATOMIC_TYPE,
0054:                            Type.UNTYPED_ATOMIC_TYPE, NUMERIC_ARITHMETIC,
0055:                            Type.NUMBER_TYPE),
0056:
0057:                    new Signature(Type.DATE_TYPE, Type.DURATION_TYPE,
0058:                            DATE_AND_DURATION, Type.DATE_TYPE),
0059:                    new Signature(Type.DURATION_TYPE, Type.DATE_TYPE,
0060:                            DATE_AND_DURATION, Type.DATE_TYPE),
0061:
0062:                    new Signature(Type.TIME_TYPE, Type.DURATION_TYPE,
0063:                            DATE_AND_DURATION, Type.TIME_TYPE),
0064:                    new Signature(Type.DURATION_TYPE, Type.TIME_TYPE,
0065:                            DATE_AND_DURATION, Type.TIME_TYPE),
0066:
0067:                    new Signature(Type.DATE_TIME_TYPE, Type.DURATION_TYPE,
0068:                            DATE_AND_DURATION, Type.DATE_TIME_TYPE),
0069:                    new Signature(Type.DURATION_TYPE, Type.DATE_TIME_TYPE,
0070:                            DATE_AND_DURATION, Type.DATE_TIME_TYPE),
0071:
0072:                    new Signature(Type.DURATION_TYPE, Type.DURATION_TYPE,
0073:                            DURATION_ADDITION, Type.DURATION_TYPE)
0074:
0075:            };
0076:
0077:            private static final Signature[] minusTable = {
0078:                    new Signature(Type.NUMBER_TYPE, Type.NUMBER_TYPE,
0079:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0080:                    new Signature(Type.NUMBER_TYPE, Type.UNTYPED_ATOMIC_TYPE,
0081:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0082:                    new Signature(Type.UNTYPED_ATOMIC_TYPE, Type.NUMBER_TYPE,
0083:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0084:                    new Signature(Type.UNTYPED_ATOMIC_TYPE,
0085:                            Type.UNTYPED_ATOMIC_TYPE, NUMERIC_ARITHMETIC,
0086:                            Type.NUMBER_TYPE),
0087:
0088:                    new Signature(Type.DATE_TYPE, Type.DATE_TYPE,
0089:                            DATE_DIFFERENCE, Type.DAY_TIME_DURATION_TYPE),
0090:                    new Signature(Type.DATE_TYPE, Type.DURATION_TYPE,
0091:                            DATE_AND_DURATION, Type.DATE_TYPE),
0092:
0093:                    new Signature(Type.TIME_TYPE, Type.TIME_TYPE,
0094:                            DATE_DIFFERENCE, Type.DAY_TIME_DURATION_TYPE),
0095:                    new Signature(Type.TIME_TYPE, Type.DURATION_TYPE,
0096:                            DATE_AND_DURATION, Type.TIME_TYPE),
0097:
0098:                    new Signature(Type.DATE_TIME_TYPE, Type.DATE_TIME_TYPE,
0099:                            DATE_DIFFERENCE, Type.DAY_TIME_DURATION_TYPE),
0100:                    new Signature(Type.DATE_TIME_TYPE, Type.DURATION_TYPE,
0101:                            DATE_AND_DURATION, Type.DATE_TIME_TYPE),
0102:
0103:                    new Signature(Type.DURATION_TYPE, Type.DURATION_TYPE,
0104:                            DURATION_ADDITION, Type.DURATION_TYPE)
0105:
0106:            };
0107:
0108:            private static final Signature[] multiplyTable = {
0109:                    new Signature(Type.NUMBER_TYPE, Type.NUMBER_TYPE,
0110:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0111:                    new Signature(Type.NUMBER_TYPE, Type.UNTYPED_ATOMIC_TYPE,
0112:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0113:                    new Signature(Type.UNTYPED_ATOMIC_TYPE, Type.NUMBER_TYPE,
0114:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0115:                    new Signature(Type.UNTYPED_ATOMIC_TYPE,
0116:                            Type.UNTYPED_ATOMIC_TYPE, NUMERIC_ARITHMETIC,
0117:                            Type.NUMBER_TYPE),
0118:
0119:                    new Signature(Type.NUMBER_TYPE, Type.DURATION_TYPE,
0120:                            DURATION_MULTIPLICATION, Type.DURATION_TYPE),
0121:                    new Signature(Type.DURATION_TYPE, Type.NUMBER_TYPE,
0122:                            DURATION_MULTIPLICATION, Type.DURATION_TYPE) };
0123:
0124:            private static final Signature[] divideTable = {
0125:                    new Signature(Type.NUMBER_TYPE, Type.NUMBER_TYPE,
0126:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0127:                    new Signature(Type.NUMBER_TYPE, Type.UNTYPED_ATOMIC_TYPE,
0128:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0129:                    new Signature(Type.UNTYPED_ATOMIC_TYPE, Type.NUMBER_TYPE,
0130:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0131:                    new Signature(Type.UNTYPED_ATOMIC_TYPE,
0132:                            Type.UNTYPED_ATOMIC_TYPE, NUMERIC_ARITHMETIC,
0133:                            Type.NUMBER_TYPE),
0134:
0135:                    new Signature(Type.DURATION_TYPE, Type.NUMBER_TYPE,
0136:                            DURATION_MULTIPLICATION, Type.DURATION_TYPE),
0137:                    new Signature(Type.DURATION_TYPE, Type.DURATION_TYPE,
0138:                            DURATION_DIVISION, Type.NUMBER_TYPE) };
0139:
0140:            private static final Signature[] idivTable = {
0141:                    new Signature(Type.NUMBER_TYPE, Type.NUMBER_TYPE,
0142:                            NUMERIC_ARITHMETIC, Type.INTEGER_TYPE),
0143:                    new Signature(Type.NUMBER_TYPE, Type.UNTYPED_ATOMIC_TYPE,
0144:                            NUMERIC_ARITHMETIC, Type.INTEGER_TYPE),
0145:                    new Signature(Type.UNTYPED_ATOMIC_TYPE, Type.NUMBER_TYPE,
0146:                            NUMERIC_ARITHMETIC, Type.INTEGER_TYPE),
0147:                    new Signature(Type.UNTYPED_ATOMIC_TYPE,
0148:                            Type.UNTYPED_ATOMIC_TYPE, NUMERIC_ARITHMETIC,
0149:                            Type.INTEGER_TYPE) };
0150:
0151:            private static final Signature[] modTable = {
0152:                    new Signature(Type.NUMBER_TYPE, Type.NUMBER_TYPE,
0153:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0154:                    new Signature(Type.NUMBER_TYPE, Type.UNTYPED_ATOMIC_TYPE,
0155:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0156:                    new Signature(Type.UNTYPED_ATOMIC_TYPE, Type.NUMBER_TYPE,
0157:                            NUMERIC_ARITHMETIC, Type.NUMBER_TYPE),
0158:                    new Signature(Type.UNTYPED_ATOMIC_TYPE,
0159:                            Type.UNTYPED_ATOMIC_TYPE, NUMERIC_ARITHMETIC,
0160:                            Type.NUMBER_TYPE) };
0161:
0162:            private boolean backwardsCompatible = false;
0163:
0164:            public ArithmeticExpression(Expression p1, int operator,
0165:                    Expression p2) {
0166:                super (p1, operator, p2);
0167:            }
0168:
0169:            /**
0170:             * Type-check the expression statically. We try to work out which particular
0171:             * arithmetic function to use if the types of operands are known an compile time.
0172:             */
0173:
0174:            public Expression typeCheck(StaticContext env,
0175:                    ItemType contextItemType) throws XPathException {
0176:
0177:                final TypeHierarchy th = env.getNamePool().getTypeHierarchy();
0178:                backwardsCompatible = env.isInBackwardsCompatibleMode();
0179:
0180:                operand0 = operand0.typeCheck(env, contextItemType);
0181:                operand1 = operand1.typeCheck(env, contextItemType);
0182:
0183:                SequenceType atomicType = SequenceType.OPTIONAL_ATOMIC;
0184:
0185:                RoleLocator role0 = new RoleLocator(RoleLocator.BINARY_EXPR,
0186:                        Token.tokens[operator], 0, null);
0187:                role0.setSourceLocator(this );
0188:                operand0 = TypeChecker.staticTypeCheck(operand0, atomicType,
0189:                        backwardsCompatible, role0, env);
0190:                // System.err.println("First operand"); operand0.display(10);
0191:
0192:                RoleLocator role1 = new RoleLocator(RoleLocator.BINARY_EXPR,
0193:                        Token.tokens[operator], 1, null);
0194:                role1.setSourceLocator(this );
0195:                operand1 = TypeChecker.staticTypeCheck(operand1, atomicType,
0196:                        backwardsCompatible, role1, env);
0197:                // System.err.println("Second operand"); operand1.display(10);
0198:
0199:                if (backwardsCompatible) {
0200:                    Expression exp = new Arithmetic10(operand0, operator,
0201:                            operand1);
0202:                    return exp.simplify(env).typeCheck(env, contextItemType);
0203:                }
0204:
0205:                Expression e = super .typeCheck(env, contextItemType);
0206:                if (e instanceof  ArithmeticExpression) {
0207:                    AtomicType type0 = (AtomicType) operand0.getItemType(th)
0208:                            .getPrimitiveItemType();
0209:                    AtomicType type1 = (AtomicType) operand1.getItemType(th)
0210:                            .getPrimitiveItemType();
0211:                    final int action = getAction(type0, operator, type1,
0212:                            backwardsCompatible);
0213:                    switch (action) {
0214:                    case NUMERIC_ARITHMETIC:
0215:                        e = new NumericArithmetic(operand0, operator, operand1);
0216:                        break;
0217:                    case DURATION_ADDITION:
0218:                        e = new DurationAddition(operand0, operator, operand1);
0219:                        break;
0220:                    case DURATION_MULTIPLICATION:
0221:                        e = new DurationMultiplication(operand0, operator,
0222:                                operand1, env.getNamePool());
0223:                        break;
0224:                    case DURATION_DIVISION:
0225:                        e = new DurationDivision(operand0, operator, operand1);
0226:                        break;
0227:                    case DATE_AND_DURATION:
0228:                        e = new DateAndDuration(operand0, operator, operand1,
0229:                                env.getNamePool());
0230:                        break;
0231:                    case DATE_DIFFERENCE:
0232:                        e = new DateDifference(operand0, operator, operand1);
0233:                        break;
0234:
0235:                    case UNKNOWN_10:
0236:                        e = new Arithmetic10(operand0, operator, operand1);
0237:                        break;
0238:
0239:                    case UNKNOWN:
0240:                        // either the types are not known yet, or they are wrong
0241:                        if (type0.isAtomicType()
0242:                                && type0 != Type.UNTYPED_ATOMIC_TYPE
0243:                                && type0 != Type.ANY_ATOMIC_TYPE
0244:                                && type1.isAtomicType()
0245:                                && type1 != Type.UNTYPED_ATOMIC_TYPE
0246:                                && type1 != Type.ANY_ATOMIC_TYPE) {
0247:                            StaticError err = new StaticError(
0248:                                    "Unsuitable operands for arithmetic operation ("
0249:                                            + type0.toString(env.getNamePool())
0250:                                            + ", "
0251:                                            + type1.toString(env.getNamePool())
0252:                                            + ')');
0253:                            err.setErrorCode("XPTY0004");
0254:                            err.setIsTypeError(true);
0255:                            err.setLocator(ExpressionTool.getLocator(this ));
0256:                            throw err;
0257:                        }
0258:                        return e;
0259:                    }
0260:                    ExpressionTool.copyLocationInfo(this , e);
0261:                    if (e instanceof  ComputedExpression) {
0262:                        ((ComputedExpression) e)
0263:                                .setParentExpression(getParentExpression());
0264:                    }
0265:                    try {
0266:                        if (operand0 instanceof  Value
0267:                                && operand1 instanceof  Value) {
0268:                            return ExpressionTool.eagerEvaluate(e, env
0269:                                    .makeEarlyEvaluationContext());
0270:                        }
0271:                    } catch (DynamicError err) {
0272:                        // Defer any error reporting until run-time
0273:                    }
0274:                }
0275:                return e;
0276:            }
0277:
0278:            /**
0279:             * Decide what action is required based on types of operands
0280:             */
0281:
0282:            private static int getAction(AtomicType type1, int operator,
0283:                    AtomicType type2, boolean backwardsCompatible) {
0284:                if (type1.getFingerprint() == Type.DAY_TIME_DURATION) {
0285:                    type1 = Type.DURATION_TYPE;
0286:                } else if (type1.getFingerprint() == Type.YEAR_MONTH_DURATION) {
0287:                    type1 = Type.DURATION_TYPE;
0288:                }
0289:                if (type2.getFingerprint() == Type.DAY_TIME_DURATION) {
0290:                    type2 = Type.DURATION_TYPE;
0291:                } else if (type2.getFingerprint() == Type.YEAR_MONTH_DURATION) {
0292:                    type2 = Type.DURATION_TYPE;
0293:                }
0294:                Signature[] table = getOperatorTable(operator);
0295:                int entry = getEntry(table, type1, type2);
0296:                if (entry < 0) {
0297:                    return (backwardsCompatible ? UNKNOWN_10 : UNKNOWN);
0298:                }
0299:                return table[entry].operation;
0300:            }
0301:
0302:            private static Signature[] getOperatorTable(int operator) {
0303:                switch (operator) {
0304:                case Token.PLUS:
0305:                    return plusTable;
0306:                case Token.MINUS:
0307:                case Token.NEGATE:
0308:                    return minusTable;
0309:                case Token.MULT:
0310:                    return multiplyTable;
0311:                case Token.DIV:
0312:                    return divideTable;
0313:                case Token.IDIV:
0314:                    return idivTable;
0315:                case Token.MOD:
0316:                    return modTable;
0317:                default:
0318:                    throw new IllegalArgumentException(
0319:                            "Unknown arithmetic operator");
0320:                }
0321:            }
0322:
0323:            private static int getEntry(Signature[] table, ItemType type1,
0324:                    ItemType type2) {
0325:                if (Type.isNumericPrimitiveType(type1)) {
0326:                    type1 = Type.NUMBER_TYPE;
0327:                }
0328:                if (Type.isNumericPrimitiveType(type2)) {
0329:                    type2 = Type.NUMBER_TYPE;
0330:                }
0331:                for (int i = 0; i < table.length; i++) {
0332:                    if (type1.equals(table[i].operand0)
0333:                            && type2.equals(table[i].operand1)) {
0334:                        return i;
0335:                    }
0336:                }
0337:                return -1;
0338:            }
0339:
0340:            /**
0341:             * Determine the data type of the expression, if this is known statically
0342:             * @param th
0343:             */
0344:
0345:            public ItemType getItemType(TypeHierarchy th) {
0346:                final ItemType t1 = operand0.getItemType(th);
0347:                final ItemType pt1 = t1.getPrimitiveItemType();
0348:                final ItemType t2 = operand1.getItemType(th);
0349:                final ItemType pt2 = t2.getPrimitiveItemType();
0350:                final Signature[] table = getOperatorTable(operator);
0351:                final int entry = getEntry(table, pt1, pt2);
0352:
0353:                if (entry < 0) {
0354:                    return Type.ANY_ATOMIC_TYPE; // type is not known statically
0355:                }
0356:
0357:                ItemType resultType = table[entry].resultType;
0358:                if (resultType == Type.NUMBER_TYPE) {
0359:                    resultType = NumericValue.promote(pt1, pt2, th);
0360:                    if (operator == Token.DIV
0361:                            && resultType == Type.INTEGER_TYPE) {
0362:                        // exception: integer div integer => decimal
0363:                        resultType = Type.DECIMAL_TYPE;
0364:                    } else {
0365:                        resultType = NumericValue.promote(pt1, pt2, th);
0366:                    }
0367:                } else if (resultType == Type.DURATION_TYPE) {
0368:                    // if one of the operands is a subtype of duration, then the result will be the same subtype
0369:                    // (this isn't captured in the table because these types are not primitive).
0370:                    if (th.isSubType(t1, Type.DAY_TIME_DURATION_TYPE)) {
0371:                        resultType = Type.DAY_TIME_DURATION_TYPE;
0372:                    } else if (th.isSubType(t2, Type.DAY_TIME_DURATION_TYPE)) {
0373:                        resultType = Type.DAY_TIME_DURATION_TYPE;
0374:                    } else if (th.isSubType(t1, Type.YEAR_MONTH_DURATION_TYPE)) {
0375:                        resultType = Type.YEAR_MONTH_DURATION_TYPE;
0376:                    } else if (th.isSubType(t2, Type.YEAR_MONTH_DURATION_TYPE)) {
0377:                        resultType = Type.YEAR_MONTH_DURATION_TYPE;
0378:                    }
0379:                }
0380:                return resultType;
0381:            }
0382:
0383:            /**
0384:             * Evaluate the expression. We only take this path if the type could not be determined
0385:             * statically.
0386:             */
0387:
0388:            public Item evaluateItem(XPathContext context)
0389:                    throws XPathException {
0390:
0391:                AtomicValue v1 = (AtomicValue) operand0.evaluateItem(context);
0392:                if (v1 == null) {
0393:                    return null;
0394:                }
0395:                v1 = v1.getPrimitiveValue();
0396:
0397:                AtomicValue v2 = (AtomicValue) operand1.evaluateItem(context);
0398:                if (v2 == null) {
0399:                    return null;
0400:                }
0401:                v2 = v2.getPrimitiveValue();
0402:
0403:                final NamePool namePool = context.getNamePool();
0404:                final TypeHierarchy th = namePool.getTypeHierarchy();
0405:                int action = getAction((AtomicType) v1.getItemType(th)
0406:                        .getPrimitiveItemType(), operator, (AtomicType) v2
0407:                        .getItemType(th).getPrimitiveItemType(),
0408:                        backwardsCompatible);
0409:
0410:                Expression e;
0411:                switch (action) {
0412:                case NUMERIC_ARITHMETIC:
0413:                    e = new NumericArithmetic(v1, operator, v2);
0414:                    break;
0415:                case DURATION_ADDITION:
0416:                    e = new DurationAddition(v1, operator, v2);
0417:                    break;
0418:                case DURATION_MULTIPLICATION:
0419:                    e = new DurationMultiplication(v1, operator, v2, namePool);
0420:                    break;
0421:                case DURATION_DIVISION:
0422:                    e = new DurationDivision(v1, operator, v2);
0423:                    break;
0424:                case DATE_AND_DURATION:
0425:                    e = new DateAndDuration(v1, operator, v2, namePool);
0426:                    break;
0427:                case DATE_DIFFERENCE:
0428:                    e = new DateDifference(v1, operator, v2);
0429:                    break;
0430:                default:
0431:                    // types are not known yet. Force to double if in 1.0 mode
0432:                    if (backwardsCompatible) {
0433:                        NumericValue nv1;
0434:                        NumericValue nv2;
0435:                        try {
0436:                            nv1 = (NumericValue) v1.convert(Type.DOUBLE,
0437:                                    context);
0438:                            nv2 = (NumericValue) v2.convert(Type.DOUBLE,
0439:                                    context);
0440:                        } catch (XPathException err) {
0441:                            typeError(
0442:                                    "Unsuitable operands for arithmetic operation ("
0443:                                            + v1.getItemType(th) + ", "
0444:                                            + v2.getItemType(th) + ')',
0445:                                    "XPTY0004", context);
0446:                            return null;
0447:                        }
0448:                        e = new NumericArithmetic(nv1, operator, nv2);
0449:                    } else {
0450:                        typeError(
0451:                                "Unsuitable operands for arithmetic operation ("
0452:                                        + v1.getItemType(th) + ", "
0453:                                        + v2.getItemType(th) + ')', "XPTY0004",
0454:                                context);
0455:                        return null;
0456:                    }
0457:                }
0458:                ExpressionTool.copyLocationInfo(this , e);
0459:                if (e instanceof  ComputedExpression) {
0460:                    ((ComputedExpression) e)
0461:                            .setParentExpression(getParentExpression());
0462:                }
0463:                return e.evaluateItem(context);
0464:            }
0465:
0466:            /**
0467:             * Inner class to handle 1.0 backwards compatible arithmetic
0468:             */
0469:            private static class Arithmetic10 extends BinaryExpression {
0470:
0471:                public boolean backwardsCompatible;
0472:
0473:                public Arithmetic10(Expression p1, int operator, Expression p2) {
0474:                    super (p1, operator, p2);
0475:                }
0476:
0477:                public Expression typeCheck(StaticContext env,
0478:                        ItemType contextItemType) throws XPathException {
0479:
0480:                    final TypeHierarchy th = env.getNamePool()
0481:                            .getTypeHierarchy();
0482:                    SequenceType atomicType = SequenceType.OPTIONAL_ATOMIC;
0483:
0484:                    RoleLocator role0 = new RoleLocator(
0485:                            RoleLocator.BINARY_EXPR, Token.tokens[operator], 0,
0486:                            null);
0487:                    role0.setSourceLocator(this );
0488:                    operand0 = TypeChecker.staticTypeCheck(operand0,
0489:                            atomicType, backwardsCompatible, role0, env);
0490:
0491:                    RoleLocator role1 = new RoleLocator(
0492:                            RoleLocator.BINARY_EXPR, Token.tokens[operator], 1,
0493:                            null);
0494:                    role1.setSourceLocator(this );
0495:                    operand1 = TypeChecker.staticTypeCheck(operand1,
0496:                            atomicType, backwardsCompatible, role1, env);
0497:
0498:                    Expression e = super .typeCheck(env, contextItemType);
0499:                    if (e instanceof  ArithmeticExpression) {
0500:                        AtomicType type0 = (AtomicType) operand0
0501:                                .getItemType(th).getPrimitiveItemType();
0502:                        AtomicType type1 = (AtomicType) operand1
0503:                                .getItemType(th).getPrimitiveItemType();
0504:                        if (backwardsCompatible) {
0505:                            if (type0 == Type.BOOLEAN_TYPE) {
0506:                                type0 = Type.NUMBER_TYPE;
0507:                            } else if (type0 == Type.STRING_TYPE) {
0508:                                type0 = Type.NUMBER_TYPE;
0509:                            }
0510:                            if (type1 == Type.BOOLEAN_TYPE) {
0511:                                type1 = Type.NUMBER_TYPE;
0512:                            } else if (type1 == Type.STRING_TYPE) {
0513:                                type1 = Type.NUMBER_TYPE;
0514:                            }
0515:                        }
0516:                        final int action = getAction(type0, operator, type1,
0517:                                backwardsCompatible);
0518:                        switch (action) {
0519:                        case NUMERIC_ARITHMETIC:
0520:                            e = new NumericArithmetic(operand0, operator,
0521:                                    operand1);
0522:                            ((NumericArithmetic) e)
0523:                                    .setBackwardsCompatible(backwardsCompatible);
0524:                            break;
0525:                        case DURATION_ADDITION:
0526:                            e = new DurationAddition(operand0, operator,
0527:                                    operand1);
0528:                            break;
0529:                        case DURATION_MULTIPLICATION:
0530:                            e = new DurationMultiplication(operand0, operator,
0531:                                    operand1, env.getNamePool());
0532:                            break;
0533:                        case DURATION_DIVISION:
0534:                            e = new DurationDivision(operand0, operator,
0535:                                    operand1);
0536:                            break;
0537:                        case DATE_AND_DURATION:
0538:                            e = new DateAndDuration(operand0, operator,
0539:                                    operand1, env.getNamePool());
0540:                            break;
0541:                        case DATE_DIFFERENCE:
0542:                            e = new DateDifference(operand0, operator, operand1);
0543:                            break;
0544:
0545:                        case UNKNOWN_10:
0546:                            e = new Arithmetic10(operand0, operator, operand1);
0547:                            break;
0548:
0549:                        case UNKNOWN:
0550:                            // either the types are not known yet, or they are wrong
0551:                            if (type0.isAtomicType()
0552:                                    && type0 != Type.UNTYPED_ATOMIC_TYPE
0553:                                    && type0 != Type.ANY_ATOMIC_TYPE
0554:                                    && type1.isAtomicType()
0555:                                    && type1 != Type.UNTYPED_ATOMIC_TYPE
0556:                                    && type1 != Type.ANY_ATOMIC_TYPE) {
0557:                                StaticError err = new StaticError(
0558:                                        "Unsuitable operands for arithmetic operation ("
0559:                                                + type0.toString(env
0560:                                                        .getNamePool())
0561:                                                + ", "
0562:                                                + type1.toString(env
0563:                                                        .getNamePool()) + ')');
0564:                                err.setErrorCode("XPTY0004");
0565:                                err.setIsTypeError(true);
0566:                                throw err;
0567:                            }
0568:                            return e;
0569:                        }
0570:                        ExpressionTool.copyLocationInfo(this , e);
0571:                        if (e instanceof  ComputedExpression) {
0572:                            ((ComputedExpression) e)
0573:                                    .setParentExpression(getParentExpression());
0574:                        }
0575:                        try {
0576:                            if (operand0 instanceof  Value
0577:                                    && operand1 instanceof  Value) {
0578:                                return ExpressionTool.eagerEvaluate(e, env
0579:                                        .makeEarlyEvaluationContext());
0580:                            }
0581:                        } catch (DynamicError err) {
0582:                            // Defer any error reporting until run-time
0583:                        }
0584:                    }
0585:                    return e;
0586:                }
0587:
0588:                /**
0589:                 * Determine the data type of the expression, if possible. All expression return
0590:                 * sequences, in general; this method determines the type of the items within the
0591:                 * sequence, assuming that (a) this is known in advance, and (b) it is the same for
0592:                 * all items in the sequence.
0593:                 * <p/>
0594:                 * <p>This method should always return a result, though it may be the best approximation
0595:                 * that is available at the time.</p>
0596:                 *
0597:                 * @return a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER,
0598:                 *         Type.NODE, or Type.ITEM (meaning not known at compile time)
0599:                 * @param th
0600:                 */
0601:
0602:                public ItemType getItemType(TypeHierarchy th) {
0603:                    return Type.ANY_ATOMIC_TYPE;
0604:                }
0605:
0606:                /**
0607:                 * Evaluate the expression.
0608:                 */
0609:
0610:                public Item evaluateItem(XPathContext context)
0611:                        throws XPathException {
0612:
0613:                    AtomicValue v1 = (AtomicValue) operand0
0614:                            .evaluateItem(context);
0615:                    if (v1 == null) {
0616:                        return DoubleValue.NaN;
0617:                    }
0618:                    v1 = v1.getPrimitiveValue();
0619:                    if (v1 instanceof  BooleanValue || v1 instanceof  StringValue
0620:                            || v1 instanceof  NumericValue) {
0621:                        try {
0622:                            v1 = v1.convert(Type.DOUBLE, context);
0623:                        } catch (XPathException e) {
0624:                            return DoubleValue.NaN;
0625:                        }
0626:                    }
0627:
0628:                    AtomicValue v2 = (AtomicValue) operand1
0629:                            .evaluateItem(context);
0630:                    if (v2 == null) {
0631:                        return DoubleValue.NaN;
0632:                    }
0633:                    v2 = v2.getPrimitiveValue();
0634:                    if (v2 instanceof  BooleanValue || v2 instanceof  StringValue
0635:                            || v2 instanceof  NumericValue) {
0636:                        try {
0637:                            v2 = v2.convert(Type.DOUBLE, context);
0638:                        } catch (XPathException e) {
0639:                            return DoubleValue.NaN;
0640:                        }
0641:                    }
0642:
0643:                    final TypeHierarchy th = context.getNamePool()
0644:                            .getTypeHierarchy();
0645:                    int action = getAction((AtomicType) v1.getItemType(th)
0646:                            .getPrimitiveItemType(), operator, (AtomicType) v2
0647:                            .getItemType(th).getPrimitiveItemType(),
0648:                            backwardsCompatible);
0649:
0650:                    switch (action) {
0651:                    case NUMERIC_ARITHMETIC:
0652:                        try {
0653:                            return NumericArithmetic.doArithmetic(v1, operator,
0654:                                    v2, context, backwardsCompatible);
0655:                        } catch (XPathException ex) {
0656:                            if (ex.getLocator() == null) {
0657:                                ex.setLocator(this );
0658:                            }
0659:                            throw ex;
0660:                        }
0661:
0662:                    case DURATION_ADDITION:
0663:                        try {
0664:                            return DurationAddition.doArithmetic(v1, operator,
0665:                                    v2, context);
0666:                        } catch (XPathException ex) {
0667:                            if (ex.getLocator() == null) {
0668:                                ex.setLocator(this );
0669:                            }
0670:                            throw ex;
0671:                        }
0672:
0673:                    case DURATION_MULTIPLICATION:
0674:                        try {
0675:                            return DurationMultiplication.doArithmetic(v1,
0676:                                    operator, v2, context);
0677:                        } catch (XPathException ex) {
0678:                            if (ex.getLocator() == null) {
0679:                                ex.setLocator(this );
0680:                            }
0681:                            throw ex;
0682:                        }
0683:
0684:                    case DURATION_DIVISION:
0685:                        try {
0686:                            return DurationDivision.doArithmetic(v1, v2,
0687:                                    context);
0688:                        } catch (XPathException ex) {
0689:                            if (ex.getLocator() == null) {
0690:                                ex.setLocator(this );
0691:                            }
0692:                            throw ex;
0693:                        }
0694:
0695:                    case DATE_AND_DURATION:
0696:                        try {
0697:                            return DateAndDuration.doArithmetic(v1, operator,
0698:                                    v2, context);
0699:                        } catch (XPathException ex) {
0700:                            if (ex.getLocator() == null) {
0701:                                ex.setLocator(this );
0702:                            }
0703:                            throw ex;
0704:                        }
0705:
0706:                    case DATE_DIFFERENCE:
0707:                        try {
0708:                            return DateDifference.doArithmetic(v1, v2, context);
0709:                        } catch (XPathException ex) {
0710:                            if (ex.getLocator() == null) {
0711:                                ex.setLocator(this );
0712:                            }
0713:                            throw ex;
0714:                        }
0715:
0716:                    default:
0717:                        typeError(
0718:                                "Unsuitable operands for arithmetic operation ("
0719:                                        + v1.getItemType(th) + ", "
0720:                                        + v2.getItemType(th) + ')', "XPTY0004",
0721:                                context);
0722:                        return null;
0723:                    }
0724:
0725:                }
0726:            }
0727:
0728:            /**
0729:             * Inner class to handle numeric arithmetic expressions
0730:             */
0731:
0732:            public static class NumericArithmetic extends ArithmeticExpression {
0733:
0734:                boolean backwardsCompatible = false;
0735:
0736:                public NumericArithmetic(Expression p1, int operator,
0737:                        Expression p2) {
0738:                    super (p1, operator, p2);
0739:                }
0740:
0741:                public void setBackwardsCompatible(boolean flag) {
0742:                    backwardsCompatible = flag;
0743:                }
0744:
0745:                /**
0746:                 * Evaluate the expression.
0747:                 */
0748:
0749:                public Item evaluateItem(XPathContext context)
0750:                        throws XPathException {
0751:                    try {
0752:                        return doArithmetic(operand0, operator, operand1,
0753:                                context, backwardsCompatible);
0754:                    } catch (XPathException err) {
0755:                        if (err.getLocator() == null) {
0756:                            err.setLocator(this );
0757:                        }
0758:                        throw err;
0759:                    }
0760:                }
0761:
0762:                public static Item doArithmetic(Expression operand0,
0763:                        int operator, Expression operand1,
0764:                        XPathContext context, boolean backwardsCompatible)
0765:                        throws XPathException {
0766:
0767:                    AtomicValue v1 = ((AtomicValue) operand0
0768:                            .evaluateItem(context));
0769:                    if (v1 == null) {
0770:                        return null;
0771:                    }
0772:
0773:                    if (v1 instanceof  UntypedAtomicValue) {
0774:                        try {
0775:                            v1 = new DoubleValue(Value.stringToNumber(v1
0776:                                    .getStringValueCS()));
0777:                        } catch (NumberFormatException e) {
0778:                            if (backwardsCompatible) {
0779:                                v1 = DoubleValue.NaN;
0780:                            } else {
0781:                                DynamicError err = new DynamicError(
0782:                                        "Failure converting untyped value "
0783:                                                + Err.wrap(v1
0784:                                                        .getStringValueCS(),
0785:                                                        Err.VALUE)
0786:                                                + " to a number");
0787:                                err.setErrorCode("FORG0001");
0788:                                err.setXPathContext(context);
0789:                                throw err;
0790:                            }
0791:                        }
0792:                    } else {
0793:                        v1 = v1.getPrimitiveValue();
0794:                    }
0795:                    AtomicValue v2 = ((AtomicValue) operand1
0796:                            .evaluateItem(context));
0797:                    if (v2 == null) {
0798:                        return null;
0799:                    }
0800:
0801:                    if (v2 instanceof  UntypedAtomicValue) {
0802:                        try {
0803:                            v2 = new DoubleValue(Value.stringToNumber(v2
0804:                                    .getStringValueCS()));
0805:                        } catch (NumberFormatException e) {
0806:                            if (backwardsCompatible) {
0807:                                v2 = DoubleValue.NaN;
0808:                            } else {
0809:                                DynamicError err = new DynamicError(
0810:                                        "Failure converting untyped value "
0811:                                                + Err.wrap(v2
0812:                                                        .getStringValueCS(),
0813:                                                        Err.VALUE)
0814:                                                + " to a number");
0815:                                err.setErrorCode("FORG0001");
0816:                                err.setXPathContext(context);
0817:                                throw err;
0818:                            }
0819:                        }
0820:                    } else {
0821:                        v2 = v2.getPrimitiveValue();
0822:                    }
0823:
0824:                    if (operator == Token.NEGATE) {
0825:                        return ((NumericValue) v2).negate();
0826:                    } else {
0827:                        try {
0828:                            return ((NumericValue) v1).arithmetic(operator,
0829:                                    (NumericValue) v2, context);
0830:                        } catch (DynamicError err) {
0831:                            if (err.getXPathContext() == null) {
0832:                                err.setXPathContext(context);
0833:                            }
0834:                            throw err;
0835:                        } catch (ArithmeticException err) {
0836:                            DynamicError e = new DynamicError(
0837:                                    "Arithmetic exception: " + err.getMessage());
0838:                            e.setXPathContext(context);
0839:                            throw e;
0840:                        }
0841:                    }
0842:                }
0843:            }
0844:
0845:            /**
0846:             * Inner class to handle addition and subtraction of two durations
0847:             */
0848:
0849:            public static class DurationAddition extends ArithmeticExpression {
0850:
0851:                public DurationAddition(Expression p1, int operator,
0852:                        Expression p2) {
0853:                    super (p1, operator, p2);
0854:                }
0855:
0856:                /**
0857:                 * Evaluate the expression.
0858:                 */
0859:
0860:                public Item evaluateItem(XPathContext context)
0861:                        throws XPathException {
0862:                    try {
0863:                        return doArithmetic(operand0, operator, operand1,
0864:                                context);
0865:                    } catch (XPathException err) {
0866:                        if (err.getLocator() == null) {
0867:                            err.setLocator(this );
0868:                        }
0869:                        throw err;
0870:                    }
0871:                }
0872:
0873:                public static Item doArithmetic(Expression operand0,
0874:                        int operator, Expression operand1, XPathContext context)
0875:                        throws XPathException {
0876:
0877:                    AtomicValue av1 = (AtomicValue) operand0
0878:                            .evaluateItem(context);
0879:                    if (av1 == null) {
0880:                        return null;
0881:                    }
0882:                    DurationValue v1 = (DurationValue) av1.getPrimitiveValue();
0883:
0884:                    AtomicValue av2 = (AtomicValue) operand1
0885:                            .evaluateItem(context);
0886:                    if (av2 == null) {
0887:                        return null;
0888:                    }
0889:                    DurationValue v2 = (DurationValue) av2.getPrimitiveValue();
0890:
0891:                    if (operator == Token.PLUS) {
0892:                        return v1.add(v2, context);
0893:                    } else if (operator == Token.MINUS) {
0894:                        return v1.subtract(v2, context);
0895:                    } else {
0896:                        throw new AssertionError(
0897:                                "Unknown operation on durations");
0898:                    }
0899:
0900:                }
0901:            }
0902:
0903:            /**
0904:             * Inner class to handle multiplication (or division) of a duration by a number
0905:             */
0906:
0907:            public static class DurationMultiplication extends
0908:                    ArithmeticExpression {
0909:
0910:                public DurationMultiplication(Expression p1, int operator,
0911:                        Expression p2, NamePool pool) {
0912:
0913:                    // by the time we get here, we know that one of the operands is a duration,
0914:                    // but it might be either one. We make it the first.
0915:
0916:                    super (p1, operator, p2);
0917:                    final TypeHierarchy th = pool.getTypeHierarchy();
0918:                    if (th.isSubType(p2.getItemType(th), Type.DURATION_TYPE)) {
0919:                        operand0 = p2;
0920:                        operand1 = p1;
0921:                    }
0922:                }
0923:
0924:                /**
0925:                 * Evaluate the expression.
0926:                 */
0927:
0928:                public Item evaluateItem(XPathContext context)
0929:                        throws XPathException {
0930:                    try {
0931:                        return doArithmetic(operand0, operator, operand1,
0932:                                context);
0933:                    } catch (XPathException err) {
0934:                        if (err.getLocator() == null) {
0935:                            err.setLocator(this );
0936:                        }
0937:                        throw err;
0938:                    }
0939:                }
0940:
0941:                public static Item doArithmetic(Expression operand0,
0942:                        int operator, Expression operand1, XPathContext context)
0943:                        throws XPathException {
0944:
0945:                    AtomicValue av1 = (AtomicValue) operand0
0946:                            .evaluateItem(context);
0947:                    if (av1 == null) {
0948:                        return null;
0949:                    }
0950:                    DurationValue v1 = (DurationValue) av1.getPrimitiveValue();
0951:
0952:                    AtomicValue av2 = (AtomicValue) operand1
0953:                            .evaluateItem(context);
0954:                    if (av2 == null) {
0955:                        return null;
0956:                    }
0957:                    NumericValue v2 = (NumericValue) av2.getPrimitiveValue();
0958:
0959:                    double d = v2.getDoubleValue();
0960:
0961:                    if (operator == Token.DIV) {
0962:                        d = 1.0 / d;
0963:                    }
0964:
0965:                    return v1.multiply(d, context);
0966:
0967:                }
0968:            }
0969:
0970:            /**
0971:             * Inner class to handle division of two durations to give a number
0972:             */
0973:
0974:            public static class DurationDivision extends ArithmeticExpression {
0975:
0976:                public DurationDivision(Expression p1, int operator,
0977:                        Expression p2) {
0978:                    super (p1, operator, p2);
0979:                }
0980:
0981:                /**
0982:                 * Evaluate the expression.
0983:                 */
0984:
0985:                public Item evaluateItem(XPathContext context)
0986:                        throws XPathException {
0987:                    try {
0988:                        return doArithmetic(operand0, operand1, context);
0989:                    } catch (XPathException err) {
0990:                        if (err.getLocator() == null) {
0991:                            err.setLocator(this );
0992:                        }
0993:                        throw err;
0994:                    }
0995:                }
0996:
0997:                public static Item doArithmetic(Expression operand0,
0998:                        Expression operand1, XPathContext context)
0999:                        throws XPathException {
1000:
1001:                    AtomicValue av1 = (AtomicValue) operand0
1002:                            .evaluateItem(context);
1003:                    if (av1 == null) {
1004:                        return null;
1005:                    }
1006:                    DurationValue v1 = (DurationValue) av1.getPrimitiveValue();
1007:
1008:                    AtomicValue av2 = (AtomicValue) operand1
1009:                            .evaluateItem(context);
1010:                    if (av2 == null) {
1011:                        return null;
1012:                    }
1013:                    DurationValue v2 = (DurationValue) av2.getPrimitiveValue();
1014:
1015:                    return v1.divide(v2, context);
1016:
1017:                }
1018:            }
1019:
1020:            /**
1021:             * Inner class to handle addition or subtraction of a Date (or Time, or DateTime) and a Duration
1022:             */
1023:
1024:            public static class DateAndDuration extends ArithmeticExpression {
1025:
1026:                public DateAndDuration(Expression p1, int operator,
1027:                        Expression p2, NamePool pool) {
1028:
1029:                    // by the time we get here, we know that one of the operands is a duration,
1030:                    // but it might be either one. We make it the second.
1031:
1032:                    super (p1, operator, p2);
1033:                    final TypeHierarchy th = pool.getTypeHierarchy();
1034:                    if (th.isSubType(p1.getItemType(th), Type.DURATION_TYPE)) {
1035:                        operand0 = p2;
1036:                        operand1 = p1;
1037:                    }
1038:
1039:                }
1040:
1041:                /**
1042:                 * Evaluate the expression.
1043:                 */
1044:
1045:                public Item evaluateItem(XPathContext context)
1046:                        throws XPathException {
1047:                    try {
1048:                        return doArithmetic(operand0, operator, operand1,
1049:                                context);
1050:                    } catch (XPathException err) {
1051:                        if (err.getLocator() == null) {
1052:                            err.setLocator(this );
1053:                        }
1054:                        throw err;
1055:                    }
1056:                }
1057:
1058:                public static Item doArithmetic(Expression operand0,
1059:                        int operator, Expression operand1, XPathContext context)
1060:                        throws XPathException {
1061:                    AtomicValue av1 = (AtomicValue) operand0
1062:                            .evaluateItem(context);
1063:                    if (av1 == null) {
1064:                        return null;
1065:                    }
1066:                    CalendarValue v1 = (CalendarValue) av1.getPrimitiveValue();
1067:
1068:                    AtomicValue av2 = (AtomicValue) operand1
1069:                            .evaluateItem(context);
1070:                    if (av2 == null) {
1071:                        return null;
1072:                    }
1073:                    DurationValue v2 = (DurationValue) av2.getPrimitiveValue();
1074:
1075:                    if (operator == Token.MINUS) {
1076:                        v2 = v2.multiply(-1.0, context);
1077:                    }
1078:
1079:                    return v1.add(v2);
1080:
1081:                }
1082:            }
1083:
1084:            /**
1085:             * Inner class to handle subtraction of a Date (or Time, or DateTime) from another, to return a Duration
1086:             */
1087:
1088:            public static class DateDifference extends ArithmeticExpression {
1089:
1090:                public DateDifference(Expression p1, int operator, Expression p2) {
1091:                    super (p1, operator, p2);
1092:                }
1093:
1094:                /**
1095:                 * Evaluate the expression.
1096:                 */
1097:
1098:                public Item evaluateItem(XPathContext context)
1099:                        throws XPathException {
1100:                    try {
1101:                        return doArithmetic(operand0, operand1, context);
1102:                    } catch (XPathException err) {
1103:                        if (err.getLocator() == null) {
1104:                            err.setLocator(this );
1105:                        }
1106:                        throw err;
1107:                    }
1108:                }
1109:
1110:                public static Item doArithmetic(Expression operand0,
1111:                        Expression operand1, XPathContext context)
1112:                        throws XPathException {
1113:                    AtomicValue av1 = (AtomicValue) operand0
1114:                            .evaluateItem(context);
1115:                    if (av1 == null) {
1116:                        return null;
1117:                    }
1118:                    CalendarValue v1 = (CalendarValue) av1.getPrimitiveValue();
1119:
1120:                    AtomicValue av2 = (AtomicValue) operand1
1121:                            .evaluateItem(context);
1122:                    if (av2 == null) {
1123:                        return null;
1124:                    }
1125:                    CalendarValue v2 = (CalendarValue) av2.getPrimitiveValue();
1126:
1127:                    return v1.subtract(v2, context);
1128:
1129:                }
1130:            }
1131:
1132:        }
1133:
1134:        //
1135:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
1136:        // you may not use this file except in compliance with the License. You may obtain a copy of the
1137:        // License at http://www.mozilla.org/MPL/
1138:        //
1139:        // Software distributed under the License is distributed on an "AS IS" basis,
1140:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
1141:        // See the License for the specific language governing rights and limitations under the License.
1142:        //
1143:        // The Original Code is: all this file.
1144:        //
1145:        // The Initial Developer of the Original Code is Michael H. Kay
1146:        //
1147:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
1148:        //
1149:        // Contributor(s): none.
1150:        //
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