Package com.icl.saxon.expr
Class Function
- java.lang.Object
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- com.icl.saxon.expr.Expression
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- com.icl.saxon.expr.Function
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- Direct Known Subclasses:
BooleanFn
,Ceiling
,Concat
,Contains
,Count
,Current
,Document
,ElementAvailable
,Floor
,FormatNumber
,FunctionAvailable
,FunctionProxy
,GenerateId
,Id
,Key
,Lang
,Last
,LocalName
,NameFn
,NamespaceURI
,NormalizeSpace
,Not
,NumberFn
,Position
,Round
,StartsWith
,StringFn
,StringLength
,StyleSheetFunctionCall
,Substring
,SubstringAfter
,SubstringBefore
,Sum
,SystemProperty
,Translate
,UnparsedEntityURI
public abstract class Function extends Expression
Abstract superclass for system-defined and user-defined functions
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Field Summary
Fields Modifier and Type Field Description protected Expression[]
argument
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Fields inherited from class com.icl.saxon.expr.Expression
staticContext
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Constructor Summary
Constructors Constructor Description Function()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description void
addArgument(Expression expr)
Method to add an argument during function definition.protected int
checkArgumentCount(int min, int max)
Check number of arguments.void
display(int level)
Diagnostic print of expression structureabstract java.lang.String
getName()
Get the name of the function.int
getNumberOfArguments()
Determine the number of actual arguments supplied in the function call-
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getDataType, getDependencies, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, reduce, setStaticContext, simplify, usesCurrent
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Field Detail
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argument
protected Expression[] argument
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Method Detail
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addArgument
public void addArgument(Expression expr)
Method to add an argument during function definition.
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getNumberOfArguments
public int getNumberOfArguments()
Determine the number of actual arguments supplied in the function call
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getName
public abstract java.lang.String getName()
Get the name of the function. This method must be implemented in all subclasses.- Returns:
- the name of the function, as used in XSL expressions, but excluding its namespace prefix
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checkArgumentCount
protected int checkArgumentCount(int min, int max) throws XPathException
Check number of arguments.
A convenience routine for use in subclasses.- Parameters:
min
- the minimum number of arguments allowedmax
- the maximum number of arguments allowed- Returns:
- the actual number of arguments
- Throws:
XPathException
- if the number of arguments is out of range
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display
public void display(int level)
Diagnostic print of expression structure- Specified by:
display
in classExpression
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