net.sf.saxon.xpath
public class XPathFunctionCall extends FunctionCall
argument
EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
Constructor and Description |
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XPathFunctionCall(javax.xml.xpath.XPathFunction function)
Default constructor
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Modifier and Type | Method and Description |
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PathMap.PathMapNodeSet |
addToPathMap(PathMap pathMap,
PathMap.PathMapNodeSet pathMapNodeSet)
Add a representation of this expression to a PathMap.
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protected SequenceIterator |
call(ValueRepresentation[] argValues,
XPathContext context)
Call an extension function previously identified using the bind() method.
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void |
checkArguments(ExpressionVisitor visitor)
Method called by the expression parser when all arguments have been supplied
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int |
computeCardinality()
Determine the cardinality of the result
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Expression |
copy()
Copy an expression.
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int |
getIntrinsicDependencies()
Determine which aspects of the context the expression depends on.
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible.
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SequenceIterator |
iterate(XPathContext context)
Evaluate the function.
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Expression |
preEvaluate(ExpressionVisitor visitor)
preEvaluate: this method suppresses compile-time evaluation by doing nothing
(because the external function might have side-effects and might use the context)
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addExternalFunctionCallToPathMap, checkArgumentCount, equals, explain, getArguments, getDisplayName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, optimize, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheck
adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeSpecialProperties, computeStaticProperties, display, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, findParentOf, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isUpdatingExpression, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, typeError
public XPathFunctionCall(javax.xml.xpath.XPathFunction function)
public Expression preEvaluate(ExpressionVisitor visitor)
preEvaluate
in class FunctionCall
visitor
- an expression visitorpublic void checkArguments(ExpressionVisitor visitor) throws XPathException
checkArguments
in class FunctionCall
visitor
- the expression visitorXPathException
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class Expression
public Expression copy()
copy
in class Expression
public PathMap.PathMapNodeSet addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet)
The default implementation of this method assumes that an expression does no navigation other than the navigation done by evaluating its subexpressions, and that the subexpressions are evaluated in the same context as the containing expression. The method must be overridden for any expression where these assumptions do not hold. For example, implementations exist for AxisExpression, ParentExpression, and RootExpression (because they perform navigation), and for the doc(), document(), and collection() functions because they create a new navigation root. Implementations also exist for PathExpression and FilterExpression because they have subexpressions that are evaluated in a different context from the calling expression.
addToPathMap
in class Expression
pathMap
- the PathMap to which the expression should be addedpathMapNodeSet
- public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface SequenceIterable
iterate
in class Expression
context
- The context in which the function is to be evaluatedXPathException
- if the function cannot be evaluated.protected SequenceIterator call(ValueRepresentation[] argValues, XPathContext context) throws XPathException
argValues
- The values of the argumentscontext
- The XPath dynamic contextXPathException
public ItemType getItemType(TypeHierarchy th)
This method will always return a result, though it may be the best approximation that is available at the time.
getItemType
in class Expression
th
- the type hierarchy cachepublic int computeCardinality()
computeCardinality
in class Expression