net.sf.saxon.functions

Class Minimax

public class Minimax extends CollatingFunction

This class implements the min() and max() functions
Field Summary
static intMAX
static intMIN
Method Summary
voidcheckArguments(StaticContext env)
Static analysis: prevent sorting of the argument
ItemevaluateItem(XPathContext context)
Evaluate the function
Expressionoptimize(Optimizer opt, StaticContext env, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
voidsetIgnoreNaN(boolean ignore)

Field Detail

MAX

public static final int MAX

MIN

public static final int MIN

Method Detail

checkArguments

public void checkArguments(StaticContext env)
Static analysis: prevent sorting of the argument

evaluateItem

public Item evaluateItem(XPathContext context)
Evaluate the function

optimize

public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

Parameters: opt the optimizer in use. This provides access to supporting functions; it also allows different optimization strategies to be used in different circumstances. env the static context of the expression contextItemType the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to ITEM_TYPE

Returns: the original expression, rewritten if appropriate to optimize execution

Throws: net.sf.saxon.trans.StaticError if an error is discovered during this phase (typically a type error)

setIgnoreNaN

public void setIgnoreNaN(boolean ignore)