Package net.sf.saxon.expr
Class ArithmeticExpression
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.BinaryExpression
net.sf.saxon.expr.ArithmeticExpression
- All Implemented Interfaces:
Serializable
,SourceLocator
,Container
,Expression
,InstructionInfoProvider
- Direct Known Subclasses:
ArithmeticExpression.DateAndDuration
,ArithmeticExpression.DateDifference
,ArithmeticExpression.DurationAddition
,ArithmeticExpression.DurationDivision
,ArithmeticExpression.DurationMultiplication
,ArithmeticExpression.NumericArithmetic
Arithmetic Expression: an expression using one of the operators
plus, minus, multiply, div, idiv, mod.
- See Also:
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic class
Inner class to handle addition or subtraction of a Date (or Time, or DateTime) and a Durationstatic class
Inner class to handle subtraction of a Date (or Time, or DateTime) from another, to return a Durationstatic class
Inner class to handle addition and subtraction of two durationsstatic class
Inner class to handle division of two durations to give a numberstatic class
Inner class to handle multiplication (or division) of a duration by a numberstatic class
Inner class to handle numeric arithmetic expressions -
Field Summary
Fields inherited from class net.sf.saxon.expr.BinaryExpression
operand0, operand1, operator
Fields inherited from class net.sf.saxon.expr.ComputedExpression
locationId, staticProperties
Fields inherited from interface net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionevaluateItem
(XPathContext context) Evaluate the expression.Determine the data type of the expression, if this is known staticallytypeCheck
(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
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 Details
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ArithmeticExpression
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Method Details
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typeCheck
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:
XPathException
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getItemType
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
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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