Package net.sf.saxon.expr
Class ArithmeticExpression
- java.lang.Object
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- net.sf.saxon.expr.ComputedExpression
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- net.sf.saxon.expr.BinaryExpression
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- net.sf.saxon.expr.ArithmeticExpression
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- All Implemented Interfaces:
java.io.Serializable
,javax.xml.transform.SourceLocator
,Container
,Expression
,InstructionInfoProvider
- Direct Known Subclasses:
ArithmeticExpression.DateAndDuration
,ArithmeticExpression.DateDifference
,ArithmeticExpression.DurationAddition
,ArithmeticExpression.DurationDivision
,ArithmeticExpression.DurationMultiplication
,ArithmeticExpression.NumericArithmetic
public class ArithmeticExpression extends BinaryExpression
Arithmetic Expression: an expression using one of the operators plus, minus, multiply, div, idiv, mod.- See Also:
- Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
ArithmeticExpression.DateAndDuration
Inner class to handle addition or subtraction of a Date (or Time, or DateTime) and a Durationstatic class
ArithmeticExpression.DateDifference
Inner class to handle subtraction of a Date (or Time, or DateTime) from another, to return a Durationstatic class
ArithmeticExpression.DurationAddition
Inner class to handle addition and subtraction of two durationsstatic class
ArithmeticExpression.DurationDivision
Inner class to handle division of two durations to give a numberstatic class
ArithmeticExpression.DurationMultiplication
Inner class to handle multiplication (or division) of a duration by a numberstatic class
ArithmeticExpression.NumericArithmetic
Inner class to handle numeric arithmetic expressions
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Field Summary
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Fields inherited from class net.sf.saxon.expr.BinaryExpression
operand0, operand1, operator
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Fields inherited from class net.sf.saxon.expr.ComputedExpression
locationId, staticProperties
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Fields inherited from interface net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
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Constructor Summary
Constructors Constructor Description ArithmeticExpression(Expression p1, int operator, Expression p2)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Item
evaluateItem(XPathContext context)
Evaluate the expression.ItemType
getItemType(TypeHierarchy th)
Determine the data type of the expression, if this is known staticallyExpression
typeCheck(StaticContext env, ItemType contextItemType)
Type-check the expression statically.-
Methods inherited from class net.sf.saxon.expr.BinaryExpression
computeCardinality, computeSpecialProperties, display, displayOperator, equals, getOperands, getOperator, hashCode, isAssociative, isCommutative, isInverse, iterateSubExpressions, optimize, promote, replaceSubExpression, simplify
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Methods inherited from class net.sf.saxon.expr.ComputedExpression
adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation, typeError
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Constructor Detail
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ArithmeticExpression
public ArithmeticExpression(Expression p1, int operator, Expression p2)
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Method Detail
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typeCheck
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException
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.- Specified by:
typeCheck
in interfaceExpression
- Overrides:
typeCheck
in classBinaryExpression
- Parameters:
env
- the static context of the expressioncontextItemType
- 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 toType.ITEM_TYPE
- Returns:
- the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations
- Throws:
StaticError
- if an error is discovered during this phase (typically a type error)XPathException
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getItemType
public ItemType getItemType(TypeHierarchy th)
Determine the data type of the expression, if this is known statically- Parameters:
th
-- Returns:
- a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER, Type.NODE, or Type.ITEM (meaning not known at compile time)
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evaluateItem
public Item evaluateItem(XPathContext context) throws XPathException
Evaluate the expression. We only take this path if the type could not be determined statically.- Specified by:
evaluateItem
in interfaceExpression
- Overrides:
evaluateItem
in classComputedExpression
- Parameters:
context
- 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
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