Package net.sf.saxon.expr
Class AtomicMappingExpression
java.lang.Object
net.sf.saxon.expr.Expression
net.sf.saxon.expr.SlashExpression
net.sf.saxon.expr.AtomicMappingExpression
- All Implemented Interfaces:
Serializable
,SourceLocator
,LocationProvider
,SaxonLocator
,ContextMappingFunction
,EvaluableItem
,SequenceIterable
,InstructionInfo
,Locator
public final class AtomicMappingExpression
extends SlashExpression
implements ContextMappingFunction
An atomic mapping expression is a slash expression A/B where B has a static type that is an atomic type.
For example, * / name().
- See Also:
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Field Summary
Fields inherited from class net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncopy()
Copy an expression.void
explain
(ExpressionPresenter destination) Diagnostic print of expression structure.boolean
isHybrid()
Determine whether this expression is capable (as far as static analysis is concerned) of returning a mixture of nodes and atomic values.iterate
(XPathContext context) Iterate the path-expression in a given contexttypeCheck
(ExpressionVisitor visitor, ItemType contextItemType) Type-check the expressionMethods inherited from class net.sf.saxon.expr.SlashExpression
computeCardinality, computeDependencies, computeSpecialProperties, equals, getItemType, getStartExpression, getStepExpression, hashCode, hasLoopingSubexpression, iterateSubExpressions, makeSlashExpression, map, optimize, promote, promoteFocusIndependentSubexpressions, replaceSubExpression, setStartExpression, setStepExpression, simplify
Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeStaticProperties, display, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, findParentOf, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, implementsStaticTypeCheck, isUpdatingExpression, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toString, typeError
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface net.sf.saxon.expr.ContextMappingFunction
map
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Constructor Details
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AtomicMappingExpression
Constructor- Parameters:
start
- A node-set expression denoting the absolute or relative set of nodes from which the navigation path should start.step
- The step to be followed from each node in the start expression to yield a new node-set
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Method Details
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isHybrid
public boolean isHybrid()Determine whether this expression is capable (as far as static analysis is concerned) of returning a mixture of nodes and atomic values. If so, this needs to be prevented at run time- Overrides:
isHybrid
in classSlashExpression
- Returns:
- true if the static type allows both nodes and atomic values
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typeCheck
Type-check the expression- Overrides:
typeCheck
in classSlashExpression
- Parameters:
visitor
- an expression visitorcontextItemType
- 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
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copy
Copy an expression. This makes a deep copy.- Overrides:
copy
in classSlashExpression
- Returns:
- the copy of the original expression
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iterate
Iterate the path-expression in a given context- Specified by:
iterate
in interfaceSequenceIterable
- Overrides:
iterate
in classSlashExpression
- Parameters:
context
- the evaluation context- Returns:
- a SequenceIterator that can be used to iterate over the result of the expression
- Throws:
XPathException
- if any dynamic error occurs evaluating the expression
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explain
Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.- Overrides:
explain
in classSlashExpression
- Parameters:
destination
- the expression presenter used to display the structure
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