Examples of net.sf.saxon.value.AtomicValue

net.sf.saxon.value.AtomicValue
The AtomicValue class corresponds to the concept of an atomic value in the XPath 2.0 data model. Atomic values belong to one of the 19 primitive types defined in XML Schema; or they are of type xs:untypedAtomic; or they are "external objects", representing a Saxon extension to the XPath 2.0 type system.
The AtomicValue class contains some methods that are suitable for applications to use, and many others that are designed for internal use by Saxon itself. These have not been fully classified. At present, therefore, none of the methods on this class should be considered to be part of the public Saxon API.
@author Michael H. Kay


                // Add the actual column values to be inserted


                int i = 1;
                for (int c=FIRST_COLUMN; c<arguments.length; c++) {
                    AtomicValue v = (AtomicValue)((SQLColumn.ColumnInstruction)arguments[c]).getSelectValue(context);


               // TODO: the values are all strings. There is no way of adding to a numeric column
                   String val = v.getStringValue();


                   // another hack: setString() doesn't seem to like single-character string values
                   if (val.length()==1) val += " ";
                   //System.err.println("Set statement parameter " + i + " to " + val);
                 ps.setObject(i++, val);

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    * Evaluate the function
    */


    public Item evaluateItem(XPathContext context) throws XPathException {


        AtomicValue val0 = (AtomicValue)argument[0].evaluateItem(context);
        if (val0==null) return null;
        NumericValue val = (NumericValue)val0;


        switch (operation) {
            case FLOOR:
                return val.floor();
            case CEILING:
                return val.ceiling();
            case ROUND:
                return val.round();
            case HALF_EVEN:
                int scale = 0;
                if (argument.length==2) {
                    AtomicValue scaleVal0 = (AtomicValue)argument[1].evaluateItem(context);
                    NumericValue scaleVal = (NumericValue)scaleVal0;
                    scale = (int)scaleVal.longValue();
                }
                return val.roundHalfToEven(scale);
            case ABS:

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    * Evaluate the function
    */


    public Item evaluateItem(XPathContext context) throws XPathException {


        AtomicValue av = (AtomicValue)argument[0].evaluateItem(context);
        if (av==null) {
            return StringValue.EMPTY_STRING;
        }
        StringValue sv = (StringValue)av;
        if (sv.isZeroLength()) {
            return StringValue.EMPTY_STRING;
        }


        AtomicValue a1 = (AtomicValue)argument[1].evaluateItem(context);
        NumericValue a = (NumericValue)a1;


        if (argument.length==2) {
            return StringValue.makeStringValue(substring(sv, a));
        } else {
            AtomicValue b2 = (AtomicValue)argument[2].evaluateItem(context);
            NumericValue b = (NumericValue)b2;
            return StringValue.makeStringValue(substring(sv, a, b, context));
        }
    }

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    /**
    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        AtomicValue sv;
        if (argument.length == 0) {
            final Item contextItem = c.getContextItem();
            if (contextItem == null) {
                dynamicError("The context item for string-length() is not set", "XPDY0002", c);
                return null;
            }
            sv = StringValue.makeStringValue(contextItem.getStringValueCS());
        } else {
            sv = (AtomicValue)argument[0].evaluateItem(c);
        }
        if (sv==null) {
            return Int64Value.ZERO;
        }




//        if (shortcut) {
//            CharSequence s = sv.getStringValueCS();
//            return (s.length()>0 ? Int64Value.PLUS_ONE : Int64Value.ZERO);
//        } else
        if (sv instanceof StringValue) {
            return Int64Value.makeIntegerValue(((StringValue)sv).getStringLength());
        } else {
            CharSequence s = sv.getStringValueCS();
            return Int64Value.makeIntegerValue(StringValue.getStringLength(s));
        }
    }

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     * @return the result of evaluating the expression (a BooleanValue)
     * @throws net.sf.saxon.trans.XPathException
     */


    public Item evaluateItem(XPathContext context) throws XPathException {
        AtomicValue hrefVal = (AtomicValue)argument[0].evaluateItem(context);
        if (hrefVal==null) {
            return BooleanValue.FALSE;
        }
        String href = hrefVal.getStringValue();


        // suppress all error messages while attempting to fetch the document
        Controller controller = context.getController();
        ErrorListener old = controller.getErrorListener();
        controller.setErrorListener(new ErrorListener() {

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    /**
    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext context) throws XPathException {
        AtomicValue av1 = (AtomicValue)argument[0].evaluateItem(context);
        if (av1==null) {
            return null;
        }
        CalendarValue in = (CalendarValue)av1;


        int nargs = argument.length;
        DayTimeDurationValue tz;
        if (nargs==1) {
            return in.adjustTimezone(context.getImplicitTimezone());
        } else {
            AtomicValue av2 = (AtomicValue)argument[1].evaluateItem(context);
            if (av2==null) {
                return in.removeTimezone();
            }
            tz = (DayTimeDurationValue)av2;
            long microseconds = tz.getLengthInMicroseconds();

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            return null;
        }
        DocumentInfo doc = (DocumentInfo)arg1;


        if (isSingletonId) {
            AtomicValue arg = (AtomicValue)argument[0].evaluateItem(context);
            if (arg==null) {
                return EmptyIterator.getInstance();
            }
            String idrefs = arg.getStringValue();
            return getIdSingle(doc, idrefs);
        } else {
            SequenceIterator idrefs = argument[0].iterate(context);
            return getIdMultiple(doc, idrefs);
        }

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    * Evaluate the expression
    */


    public Item evaluateItem(XPathContext context) throws XPathException {


        AtomicValue arg0 = (AtomicValue)argument[0].evaluateItem(context);
        if (arg0==null) {
            return null;
        }


        AtomicValue arg1 = (AtomicValue)argument[1].evaluateItem(context);
        if (arg1==null) {
            return null;
        }


        GenericAtomicComparer collator = getAtomicComparer(2, context);

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                count += length;
                if (count > 1) {
                    return false;
                }
                if (length != 0) {
                    AtomicValue av = (AtomicValue)atomizedValue.itemAt(0);
                    if (!isCastable(av, targetType, context)) {
                        return false;
                    }
                }
            } else {
                AtomicValue av = (AtomicValue)item;
                count++;
                if (count > 1) {
                    return false;
                }
                if (!isCastable(av, targetType, context)) {

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    public Item evaluateItem(XPathContext c) throws XPathException {
        int numArgs = argument.length;
        FastStringBuffer sb = new FastStringBuffer(1024);
        for (int i=0; i<numArgs; i++) {
            AtomicValue val = (AtomicValue)argument[i].evaluateItem(c);
            if (val!=null) {
                sb.append(val.getStringValueCS());
            }
        }
        return StringValue.makeStringValue(sb.condense());
    }

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