net.sf.saxon.expr

Class ArithmeticExpression

class ArithmeticExpression extends BinaryExpression

Arithmetic Expression: an expression using one of the operators plus, minus, multiply, div, idiv, mod.

Nested Class Summary
static class	ArithmeticExpression.DateAndDuration Inner class to handle addition or subtraction of a Date (or Time, or DateTime) and a Duration
static class	ArithmeticExpression.DateDifference Inner class to handle subtraction of a Date (or Time, or DateTime) from another, to return a Duration
static class	ArithmeticExpression.DurationAddition Inner class to handle addition and subtraction of two durations
static class	ArithmeticExpression.DurationDivision Inner class to handle division of two durations to give a number
static class	ArithmeticExpression.DurationMultiplication Inner class to handle multiplication (or division) of a duration by a number
static class	ArithmeticExpression.NumericArithmetic Inner class to handle numeric arithmetic expressions

Constructor Summary
	ArithmeticExpression(Expression p1, int operator, Expression p2)

Method Summary
Item	evaluateItem(XPathContext context) Evaluate the expression.
ItemType	getItemType(TypeHierarchy th) Determine the data type of the expression, if this is known statically
Expression	typeCheck(StaticContext env, ItemType contextItemType) Type-check the expression statically.

Constructor Detail

ArithmeticExpression

public ArithmeticExpression(Expression p1, int operator, Expression p2)

Method Detail

evaluateItem

public Item evaluateItem(XPathContext context)

Evaluate the expression. We only take this path if the type could not be determined statically.

getItemType

public ItemType getItemType(TypeHierarchy th)

Determine the data type of the expression, if this is known statically

Parameters: th

typeCheck

public Expression typeCheck(StaticContext env, ItemType contextItemType)

Type-check the expression statically. We try to work out which particular arithmetic function to use if the types of operands are known an compile time.