FormatNumber (saxon JavaDoc)

Class FormatNumber

public class FormatNumber extends SystemFunction

XSLT 2.0 implementation of format-number() function - removes the dependence on the JDK.

Method Summary
static BigDecimal	adjustToDecimal(double value, int precision) Convert a double to a BigDecimal.
void	checkArguments(ExpressionVisitor visitor)
Expression	copy() Copy an expression.
CharSequence	evaluateAsString(XPathContext context) Evaluate in a context where a string is wanted
Item	evaluateItem(XPathContext c) Evaluate in a general context
Expression	preEvaluate(ExpressionVisitor visitor) preEvaluate: this method suppresses compile-time evaluation by doing nothing.

Method Summary

static BigDecimal

adjustToDecimal(double value, int precision)

Convert a double to a BigDecimal.

void

checkArguments(ExpressionVisitor visitor)

Expression

copy()

Copy an expression.

CharSequence

evaluateAsString(XPathContext context)

Evaluate in a context where a string is wanted

Item

evaluateItem(XPathContext c)

Evaluate in a general context

Expression

preEvaluate(ExpressionVisitor visitor)

preEvaluate: this method suppresses compile-time evaluation by doing nothing.

Method Detail

public static BigDecimal adjustToDecimal(double value, int precision)

Convert a double to a BigDecimal. In general there will be several BigDecimal values that are equal to the supplied value, and the one we want to choose is the one with fewest non-zero digits. The algorithm used is rather pragmatic: look for a string of zeroes or nines, try rounding the number down or up as approriate, then convert the adjusted value to a double to see if it's equal to the original: if not, use the original value unchanged.

Parameters: value the double to be converted precision 2 for a double, 1 for a float

Returns: the result of conversion to a double

checkArguments

public void checkArguments(ExpressionVisitor visitor)

copy

Copy an expression. This makes a deep copy.

Returns: the copy of the original expression

evaluateAsString

public CharSequence evaluateAsString(XPathContext context)

Evaluate in a context where a string is wanted

evaluateItem

Evaluate in a general context

preEvaluate

preEvaluate: this method suppresses compile-time evaluation by doing nothing. We can't evaluate early because we don't have access to the DecimalFormatManager.

Parameters: visitor the expression visitor