Package net.sf.saxon.expr.compat

Class ArithmeticExpression10

java.lang.Object

net.sf.saxon.expr.Expression

net.sf.saxon.expr.BinaryExpression

net.sf.saxon.expr.ArithmeticExpression

net.sf.saxon.expr.compat.ArithmeticExpression10

All Implemented Interfaces:

Callable, ExportAgent, Locatable, IdentityComparable, Traceable

public class ArithmeticExpression10
extends ArithmeticExpression
implements Callable

Arithmetic Expression: an expression using one of the operators plus, minus, multiply, div, idiv, mod, in backwards compatibility mode: see ArithmeticExpression for the non-backwards compatible case.

Field Summary

Fields inherited from class net.sf.saxon.expr.ArithmeticExpression

calculator

Fields inherited from class net.sf.saxon.expr.BinaryExpression

operator

Fields inherited from class net.sf.saxon.expr.Expression

EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_COST, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD

Constructor Summary

Constructors

Constructor	Description
ArithmeticExpression10(Expression p0, int operator, Expression p1)	Create an arithmetic expression to be evaluated in XPath 1.0 mode

Method Summary

Modifier and Type	Method	Description
AtomicValue	call(XPathContext context, Sequence[] arguments)	Evaluate the expression
Expression	copy(RebindingMap rebindings)	Copy an expression.
AtomicValue	evaluateItem(XPathContext context)	Evaluate the expression.
protected void	explainExtraAttributes(ExpressionPresenter out)	Add subclass-specific attributes to the expression tree explanation.
PlainType	getItemType()	Determine the data type of the expression, if this is known statically
void	setCalculator(Calculator calc)	Set the calculator externally (used when reconstructing the expression tree)
protected java.lang.String	tag()	Get the element name used to identify this expression in exported expression format
Expression	typeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo)	Type-check the expression statically.

Methods inherited from class net.sf.saxon.expr.ArithmeticExpression

compute, computeSpecialProperties, getCalculator, getExpressionName, getIntegerBounds, getStaticUType, mapOpCode, resetLocalStaticProperties

Methods inherited from class net.sf.saxon.expr.BinaryExpression

computeCardinality, computeHashCode, displayOperator, equals, export, getImplementationMethod, getLhs, getLhsExpression, getOperandRole, getOperator, getRhs, getRhsExpression, isAssociative, isCommutative, isInverse, operands, optimize, setFlattened, setLhsExpression, setRhsExpression, toShortString, toString

Methods inherited from class net.sf.saxon.expr.Expression

addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStreamerName, getTracingTag, hasCompatibleStaticContext, hashCode, hasSpecialProperty, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isEqual, isIdentical, isInstruction, isLiftable, isMultiThreaded, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, process, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, typeCheckChildren, typeError, unordered, verifyParentPointers

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.saxon.trace.Traceable

gatherProperties

Constructor Detail

ArithmeticExpression10

public ArithmeticExpression10(Expression p0,
                              int operator,
                              Expression p1)

Create an arithmetic expression to be evaluated in XPath 1.0 mode

Parameters:

p0 - the first operand

operator - the operator, for example Token.PLUS

p1 - the second operand

Method Detail

typeCheck

public Expression typeCheck(ExpressionVisitor visitor,
                            ContextItemStaticInfo contextInfo)
                     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.

Overrides:

typeCheck in class ArithmeticExpression

Parameters:

visitor - an expression visitor

contextInfo - Information available statically about the context item: whether it is (possibly) absent; its static type; its streaming posture.

Returns:

the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations

Throws:

XPathException - if an error is discovered during this phase (typically a type error)

setCalculator

public void setCalculator(Calculator calc)

Set the calculator externally (used when reconstructing the expression tree)

Overrides:

setCalculator in class ArithmeticExpression

Parameters:

calc - the calculator to be used

getItemType

public PlainType getItemType()

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

Overrides:

getItemType in class ArithmeticExpression

Returns:

the atomic type of the result of this arithmetic expression

copy

public Expression copy(RebindingMap rebindings)

Copy an expression. This makes a deep copy.

Overrides:

copy in class ArithmeticExpression

Parameters:

rebindings -

Returns:

the copy of the original expression

tag

protected java.lang.String tag()

Description copied from class: BinaryExpression

Get the element name used to identify this expression in exported expression format

Overrides:

tag in class ArithmeticExpression

Returns:

the element name used to identify this expression

explainExtraAttributes

protected void explainExtraAttributes(ExpressionPresenter out)

Description copied from class: BinaryExpression

Add subclass-specific attributes to the expression tree explanation. Default implementation does nothing; this is provided for subclasses to override.

Overrides:

explainExtraAttributes in class ArithmeticExpression

Parameters:

out - the output destination for the displayed expression tree

evaluateItem

public AtomicValue evaluateItem(XPathContext context)
                         throws XPathException

Evaluate the expression.

Overrides:

evaluateItem in class ArithmeticExpression

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

call

public AtomicValue call(XPathContext context,
                        Sequence[] arguments)
                 throws XPathException

Evaluate the expression

Specified by:

call in interface Callable

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as SequenceIterators

Returns:

the result of the evaluation, in the form of a SequenceIterator

Throws:

XPathException - if a dynamic error occurs during the evaluation of the expression