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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.FunctionCall | +--net.sf.saxon.expr.UserFunctionCall
This class represents a call to a function defined in the stylesheet or query. It is used for all user-defined functions in XQuery, and for a limited class of user-defined functions in XSLT: those that can be reduced to the evaluation of a single expression.
Nested Class Summary | |
static class |
UserFunctionCall.FunctionCallPackage
Inner class used to wrap up the set of actual arguments to a tail-recursive call of the containing function. |
Field Summary |
Fields inherited from class net.sf.saxon.expr.FunctionCall |
argument |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
UserFunctionCall()
|
Method Summary | |
void |
checkArguments(StaticContext env)
Method called during the type checking phase |
int |
computeCardinality()
Determine the cardinality of the result |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure. |
Item |
evaluateItem(XPathContext c)
Call the function, returning the value as an item. |
int |
getFingerprint()
Get the fingerprint representing the name of the function |
ItemType |
getItemType()
Determine the data type of the expression, if possible |
java.lang.String |
getName()
Get the name of the function. |
SequenceIterator |
iterate(XPathContext c)
Call the function, returning an iterator over the results. |
boolean |
markTailFunctionCalls()
Mark tail-recursive calls on stylesheet functions. |
Expression |
preEvaluate(StaticContext env)
Pre-evaluate a function at compile time. |
void |
setFingerprint(int fingerprint)
Set the fingerprint representing the name of the function |
void |
setFunction(FunctionSignature sourceFunction,
CallableFunction compiledFunction)
Create the reference to the function to be called, and validate for consistency |
void |
setStaticType(SequenceType type)
Set the static type |
Expression |
simplify()
Simplify the function call |
Methods inherited from class net.sf.saxon.expr.FunctionCall |
analyze, checkArgumentCount, getNumberOfArguments, getSubExpressions, promote, setArguments, simplifyArguments |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public UserFunctionCall()
Method Detail |
public void setFingerprint(int fingerprint)
public int getFingerprint()
public void setStaticType(SequenceType type)
public void setFunction(FunctionSignature sourceFunction, CallableFunction compiledFunction) throws XPathException
XPathException
public java.lang.String getName()
getName
in class FunctionCall
public void checkArguments(StaticContext env) throws XPathException
checkArguments
in class FunctionCall
XPathException
public Expression preEvaluate(StaticContext env)
preEvaluate
in class FunctionCall
public ItemType getItemType()
public int computeCardinality()
computeCardinality
in class ComputedExpression
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class FunctionCall
XPathException
- if an error is discovered during expression
rewritingpublic boolean markTailFunctionCalls()
markTailFunctionCalls
in class ComputedExpression
public Item evaluateItem(XPathContext c) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
c
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
c
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void display(int level, NamePool pool)
Expression
display
in interface Expression
display
in class FunctionCall
level
- indentation level for this expression
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