Examples of net.sf.saxon.value.NumericValue.compareTo()

net.sf.saxon.value.NumericValue.compareTo()
Compare the value to another numeric value @exception ClassCastException if the other value is not a NumericValue(the parameter is declared as Object to satisfy the Comparable interface) @param other The other numeric value @return -1 if this one is the lower, 0 if they are numerically equal,+1 if this one is the higher, or if either value is NaN. Where NaN values are involved, they should be handled by the caller before invoking this method.

            // We need to be careful to handle cases such as plus/minus infinity and NaN
            if (end.isNaN()) {
                return "";
            } else if (end.signum() <= 0) {
                return "";
            } else if (end.compareTo(slength) > 0) {
                // this works even where the string contains surrogate pairs,
                // because the Java length is always >= the XPath length
                lend = slength+1;
            } else {
                try {

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    public boolean effectiveBooleanValue(XPathContext context) throws XPathException {
        NumericValue n = (NumericValue)operand.evaluateItem(context);
        if (n.isNaN()) {
            return (operator == Token.FNE);
        }
        int c = n.compareTo(comparand);
        switch (operator) {
            case Token.FEQ:
                return c == 0;
            case Token.FNE:
                return c != 0;

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                if (lstart <= 1) {
                    return seq;
                }
            } else {
                startVal = startVal.round();
                if (startVal.compareTo(Int64Value.PLUS_ONE) <= 0) {
                    return seq;
                } else if (startVal.compareTo(Int64Value.MAX_LONG) > 0) {
                    return EmptyIterator.getInstance();
                } else if (startVal.isNaN()) {
                    return EmptyIterator.getInstance();

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                }
            } else {
                startVal = startVal.round();
                if (startVal.compareTo(Int64Value.PLUS_ONE) <= 0) {
                    return seq;
                } else if (startVal.compareTo(Int64Value.MAX_LONG) > 0) {
                    return EmptyIterator.getInstance();
                } else if (startVal.isNaN()) {
                    return EmptyIterator.getInstance();
                } else {
                    lstart = startVal.longValue();

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                if (lengthVal.isNaN()) {
                    return EmptyIterator.getInstance();
                }
                lengthVal = lengthVal.round();


                if (lengthVal.compareTo(Int64Value.ZERO) <= 0) {
                    return EmptyIterator.getInstance();
                }
                NumericValue rend = (NumericValue)ArithmeticExpression.compute(
                        startVal, Calculator.PLUS, lengthVal, context);
                rend = (NumericValue)ArithmeticExpression.compute(

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                }
                NumericValue rend = (NumericValue)ArithmeticExpression.compute(
                        startVal, Calculator.PLUS, lengthVal, context);
                rend = (NumericValue)ArithmeticExpression.compute(
                        rend, Calculator.MINUS, Int64Value.PLUS_ONE, context);
                if (rend.compareTo(Int64Value.ZERO) <= 0) {
                    return EmptyIterator.getInstance();
                }


                long lstart;
                if (startVal.compareTo(Int64Value.PLUS_ONE) <= 0) {

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                if (lstart > Integer.MAX_VALUE) {
                    return EmptyIterator.getInstance();
                }


                long lend;
                if (rend.compareTo(Int64Value.MAX_LONG) >= 0) {
                    lend = Integer.MAX_VALUE;
                } else {
                    lend = rend.longValue();
                }
                return SubsequenceIterator.make(seq, (int)lstart, (int)lend);

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         */


        public Expression rewrite(StaticContext context, Expression[] arguments) throws XPathException {
            if (arguments[1] instanceof Literal) {
                NumericValue val = (NumericValue)((Literal)arguments[1]).getValue();
                if (val.compareTo(1) < 0 || val.compareTo(Integer.MAX_VALUE) > 0 || !val.isWholeNumber()) {
                    return new Literal(EmptySequence.getInstance());
                }
                if (val.compareTo(1) > 0 && !Cardinality.allowsMany(arguments[0].getCardinality())) {
                    return new Literal(EmptySequence.getInstance());
                }

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         */


        public Expression rewrite(StaticContext context, Expression[] arguments) throws XPathException {
            if (arguments[1] instanceof Literal) {
                NumericValue val = (NumericValue)((Literal)arguments[1]).getValue();
                if (val.compareTo(1) < 0 || val.compareTo(Integer.MAX_VALUE) > 0 || !val.isWholeNumber()) {
                    return new Literal(EmptySequence.getInstance());
                }
                if (val.compareTo(1) > 0 && !Cardinality.allowsMany(arguments[0].getCardinality())) {
                    return new Literal(EmptySequence.getInstance());
                }

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            if (arguments[1] instanceof Literal) {
                NumericValue val = (NumericValue)((Literal)arguments[1]).getValue();
                if (val.compareTo(1) < 0 || val.compareTo(Integer.MAX_VALUE) > 0 || !val.isWholeNumber()) {
                    return new Literal(EmptySequence.getInstance());
                }
                if (val.compareTo(1) > 0 && !Cardinality.allowsMany(arguments[0].getCardinality())) {
                    return new Literal(EmptySequence.getInstance());
                }
            }
            return null;
        }

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