Examples of net.sf.saxon.type.ConversionResult

net.sf.saxon.type.ConversionResult
This is a marker interface used as the result methods that convert or cast values from one type to another. It is implemented by AtomicValue, which indicates a successful conversion, and by ValidationFailure, which indicates an unsuccessful conversion. An unsuccessful conversion does not throw an exception because exceptions are expensive and should not be used on success paths. For example when validating a union, conversion failures are to be expected.

     * This value is calculated using the algorithm described in
     * [Appendix E Adding durations to dateTimes] of [XML Schema Part 2: Datatypes].
     * @throws XPathException
     */
    public static String add(XPathContext context, final String datetimeIn, final String durationIn) throws XPathException {
        ConversionResult cr0 = CalendarValue.makeCalendarValue(datetimeIn);
        if (cr0 instanceof ValidationFailure) {
            return "";
        }
        CalendarValue cv0 = (CalendarValue)cr0;
        if (specificity(cv0) < 0) {
            return "";
        }
        DateTimeValue v0 = cv0.toDateTime();
        ConversionResult cr1 = DurationValue.makeDuration(durationIn);
        if (cr1 instanceof ValidationFailure) {
            return "";
        }
        DurationValue v1 = (DurationValue)cr1;
        YearMonthDurationValue v1m =

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        while (true) {
            Item it = nodes.next();
            if (it == null) {
                break;
            }
            ConversionResult cr = DurationValue.makeDuration(it.getStringValueCS());
            if (cr instanceof ValidationFailure) {
                return "";
            }
            tot = addDurationValues(tot, (DurationValue)cr, context);
            if (tot == null) {

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     * are differently signed, then this sometimes results in durations that are impossible to express
     * in this syntax (e.g. 'P1M' + '-P1D'). In these cases, the function returns an empty string ('').
     */


    public String addDuration(XPathContext context, String duration0, String duration1) {
        ConversionResult dv0 = DurationValue.makeDuration(duration0);
        ConversionResult dv1 = DurationValue.makeDuration(duration1);
        if (dv0 instanceof ValidationFailure || dv1 instanceof ValidationFailure) {
            return "";
        }
        DurationValue result = addDurationValues((DurationValue)dv0, (DurationValue)dv1, context);
        return (result==null ? "" : result.getStringValue());

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     * The number of seconds specified in the duration string must be less than 60;
     * the number of minutes must be less than 60; the number of hours must be less than 24.
     * @throws XPathException
     */
    public static String difference(XPathContext context, final String dateLeftIn, final String dateRightIn) throws XPathException {
        ConversionResult op0 = CalendarValue.makeCalendarValue(dateLeftIn);
        ConversionResult op1 = CalendarValue.makeCalendarValue(dateRightIn);
        if (op0 instanceof ValidationFailure || op1 instanceof ValidationFailure) {
            return "";
        }
        CalendarValue v0 = (CalendarValue)op0;
        CalendarValue v1 = (CalendarValue)op1;

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     * for details.
     * If the argument is not in any of these formats, date:seconds returns NaN.
     * @throws XPathException
     */
    public static double seconds(XPathContext context, final String datetimeIn) throws XPathException {
        ConversionResult cr = CalendarValue.makeCalendarValue(datetimeIn);
        if (cr instanceof DateTimeValue || cr instanceof DateValue ||
                cr instanceof GYearValue || cr instanceof GYearMonthValue) {
            DateTimeValue dateTime = ((CalendarValue)cr).toDateTime();
            DayTimeDurationValue diff = dateTime.subtract(DateTimeValue.EPOCH, context);
            return diff.getLengthInSeconds();

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        Item arg0 = argument[0].evaluateItem(context);
        if (arg0==null) {
            return DoubleValue.NaN;
        }
        if (arg0 instanceof BooleanValue || arg0 instanceof NumericValue) {
            ConversionResult result = ((AtomicValue)arg0).convert(BuiltInAtomicType.DOUBLE, true, context);
            if (result instanceof ValidationFailure) {
                return DoubleValue.NaN;
            } else {
                return (AtomicValue)result;
            }

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        try {
            if (value==null) {
                return DoubleValue.NaN;
            }
            if (value instanceof BooleanValue || value instanceof NumericValue) {
                ConversionResult result = value.convert(BuiltInAtomicType.DOUBLE, true, null);
                if (result instanceof ValidationFailure) {
                    return DoubleValue.NaN;
                } else {
                    return (DoubleValue)result;
                }

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        }
        if (((AtomicType)it).isBuiltInType()) {
            // TODO
        } else {
            Configuration config = ((ConstructedItemType)type).getProcessor().getUnderlyingConfiguration();
            ConversionResult result = new StringValue(lexicalForm).convert(
                    (AtomicType)it, true, config.getConversionContext());
            try {
                setValue(result.asAtomic());
            } catch (ValidationException e) {
                throw new SaxonApiException(e);
            }
        }
    }

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        net.sf.saxon.type.ItemType it = type.getUnderlyingItemType();
        if (!it.isAtomicType()) {
            throw new SaxonApiException("Requested type is not atomic");
        }
        Configuration config = type.getProcessor().getUnderlyingConfiguration();
        ConversionResult result = new StringValue(value).convert((AtomicType)it, true, config.getConversionContext());
        try {
            return (XdmItem)wrap(result.asAtomic());
        } catch (ValidationException e) {
            throw new SaxonApiException(e);
        }
    }

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        net.sf.saxon.type.ItemType it = type.getUnderlyingItemType();
        if (!it.isAtomicType()) {
            throw new SaxonApiException("Requested type is not atomic");
        }
        Configuration config = type.getProcessor().getUnderlyingConfiguration();
        ConversionResult result = new StringValue(lexicalForm).convert(
                (AtomicType)it, true, config.getConversionContext());
        try {
            setValue(result.asAtomic());
        } catch (ValidationException e) {
            throw new SaxonApiException(e);
        }
    }

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