net.sf.saxon.functions
Class FormatNumber
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.FormatNumber
- All Implemented Interfaces:
- Expression, Serializable, XSLTFunction
- public class FormatNumber
- extends SystemFunction
- implements XSLTFunction
This is the original XSLT 1.0 implementation of format-number using the JDK
directly. It is still available for the time being under the name
format-number-1.0, in case the new version has problems.
- See Also:
- Serialized Form
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
FormatNumber
public FormatNumber()
checkArguments
public void checkArguments(StaticContext env)
throws XPathException
- Description copied from class:
SystemFunction
- Method called during static type checking
- Overrides:
checkArguments
in class SystemFunction
- Throws:
XPathException
preEvaluate
public Expression preEvaluate(StaticContext env)
- preEvaluate: this method suppresses compile-time evaluation by doing nothing.
We can't evaluate early because we don't have access to the DecimalFormatManager.
- Overrides:
preEvaluate
in class FunctionCall
evaluateAsString
public String evaluateAsString(XPathContext context)
throws XPathException
- Evaluate in a context where a string is wanted
- Specified by:
evaluateAsString
in interface Expression
- Overrides:
evaluateAsString
in class ComputedExpression
- Parameters:
context
- The context in which the expression is to be evaluated
- Returns:
- the value of the expression, evaluated in the current context.
The expression must return a string or (); if the value of the
expression is (), this method returns "".
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression
evaluateItem
public Item evaluateItem(XPathContext c)
throws XPathException
- Evaluate in a general context
- Specified by:
evaluateItem
in interface Expression
- Overrides:
evaluateItem
in class ComputedExpression
- Parameters:
c
- The context in which the expression is to be evaluated
- Returns:
- the node or atomic value that results from evaluating the
expression; or null to indicate that the result is an empty
sequence
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression
formatNumber
public String formatNumber(double n,
String format,
DecimalFormatSymbols dfs)
throws XPathException
- Here is the method that does the work. It needs to be synchronized because
it remembers information from one invocation to the next; it doesn't matter
if these are in different threads but it can't be interrupted. The reason for
remembering information is that getting a new DecimalFormatSymbols each time
is incredibly expensive, especially with the Microsoft Java VM.
- Throws:
XPathException