XQueryFunction

java.lang.Object
- net.sf.saxon.query.XQueryFunction

All Implemented Interfaces:

SourceLocator, Container, Declaration, InstructionInfo
```
public class XQueryFunction
extends Object
implements InstructionInfo, Container, Declaration
```
A user-defined function in an XQuery module

Constructor Summary

Constructors
Constructor and Description

XQueryFunction()
Create an XQuery function

Constructors
Constructor and Description
`XQueryFunction()` Create an XQuery function

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addArgument(UserFunctionParameter argument)` Add an argument to the list of arguments
`void`	`checkReferences(ExpressionVisitor visitor)` Type-check references to this function
`void`	`compile()` Compile this function to create a run-time definition that can be interpreted (note, this has nothing to do with Java code generation)
`void`	`explain(ExpressionPresenter out)` Produce diagnostic output showing the compiled and optimized expression tree for a function
`void`	`fixupReferences()` Fix up references to this function
`SequenceType[]`	`getArgumentTypes()` Get the declared types of the arguments of this function
`Expression`	`getBody()` Get the body of the function
`int`	`getColumnNumber()` Return the column number
`Configuration`	`getConfiguration()` Get the Configuration to which this Container belongs
`int`	`getConstructType()` Get the type of construct.
`int`	`getContainerGranularity()` Get the granularity of the container.
`String`	`getDisplayName()` Get the name of the function for display in error messages
`StructuredQName`	`getFunctionName()` Get the name of the function as a structured QName
`int`	`getHostLanguage()` Get the host language (XSLT, XQuery, XPath) used to implement the code in this container
`SymbolicName`	`getIdentificationKey()` Get an identifying key for this function, which incorporates the URI and local part of the function name plus the arity
`static SymbolicName`	`getIdentificationKey(StructuredQName qName, int arity)` Construct what the identification key would be for a function with given URI, local name, and arity
`int`	`getLineNumber()` Get the line number of the instruction in the source stylesheet module.
`NamespaceResolver`	`getNamespaceResolver()` Get the namespace context of the instruction.
`int`	`getNumberOfArguments()` Get the arity of the function
`StructuredQName`	`getObjectName()` Get a name identifying the object of the expression, for example a function name, template name, variable name, key name, element name, etc.
`PackageData`	`getPackageData()` Get data about the unit of compilation (XQuery module, XSLT package) to which this container belongs
`UserFunctionParameter[]`	`getParameterDefinitions()` Get the definitions of the arguments to this function
`Iterator`	`getProperties()` Get an iterator over all the properties available.
`Object`	`getProperty(String name)` Get the value of a particular property of the instruction.
`String`	`getPublicId()` Return the public identifier for the current document event.
`SequenceType`	`getResultType()` Get the result type of the function
`StaticContext`	`getStaticContext()` Get the static context for this function
`String`	`getSystemId()` Get the system identifier (URI) of the source module containing the instruction.
`UserFunction`	`getUserFunction()` Get the callable compiled function contained within this XQueryFunction definition.
`boolean`	`isMemoFunction()` Find out whether this is a memo function
`boolean`	`isPrivate()` Ask whether this is a private function (as defined in XQuery 3.0)
`boolean`	`isUpdating()` Ask whether this is an updating function (as defined in XQuery Update)
`void`	`optimize()` Optimize the body of this function
`void`	`registerReference(UserFunctionReference ufc)` Register a call on this function
`void`	`setAnnotations(Map<StructuredQName,Annotation> annotations)` Set the annotations on this function
`void`	`setBody(Expression body)` Set the body of the function
`void`	`setColumnNumber(int column)` Set the column number of the function declaration
`void`	`setFunctionName(StructuredQName name)` Set the name of the function
`void`	`setLineNumber(int line)` Set the line number of the function declaration within its module
`void`	`setMemoFunction(boolean isMemoFunction)` Set that this is, or is not, a memo function.
`void`	`setResultType(SequenceType resultType)` Set the required result type of the function
`void`	`setStaticContext(QueryModule env)` Set the static context for this function
`void`	`setSystemId(String systemId)` Set the system ID of the module containing the function
`void`	`setUpdating(boolean isUpdating)` Set whether this is an updating function (as defined in XQuery Update)

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - XQueryFunction
```
public XQueryFunction()
```
    Create an XQuery function
- Method Detail
  - getConfiguration
```
public Configuration getConfiguration()
```
    Get the Configuration to which this Container belongs
    
    Specified by:
    
    getConfiguration in interface Container
    
    Returns:
    the Configuration
  - getPackageData
```
public PackageData getPackageData()
```
    Get data about the unit of compilation (XQuery module, XSLT package) to which this container belongs
    
    Specified by:
    
    getPackageData in interface Container
    
    Returns:
    the data about the package
  - getContainerGranularity
```
public int getContainerGranularity()
```
    Get the granularity of the container.
    
    Specified by:
    
    getContainerGranularity in interface Container
    
    Returns:
    0 for a temporary container created during parsing; 1 for a container that operates at the level of an XPath expression; 2 for a container at the level of a global function or template
  - setFunctionName
```
public void setFunctionName(StructuredQName name)
```
    Set the name of the function
    
    Parameters:
    name - the name of the function as a StructuredQName object
  - addArgument
```
public void addArgument(UserFunctionParameter argument)
```
    Add an argument to the list of arguments
    
    Parameters:
    argument - the formal declaration of the argument to be added
  - setResultType
```
public void setResultType(SequenceType resultType)
```
    Set the required result type of the function
    
    Parameters:
    resultType - the declared result type of the function
  - setBody
```
public void setBody(Expression body)
```
    Set the body of the function
    
    Parameters:
    body - the expression forming the body of the function
  - getBody
```
public Expression getBody()
```
    Get the body of the function
    
    Returns:
    the expression making up the body of the function
  - setSystemId
```
public void setSystemId(String systemId)
```
    Set the system ID of the module containing the function
    
    Parameters:
    systemId - the system ID (= base URI) of the module containing the function
  - setLineNumber
```
public void setLineNumber(int line)
```
    Set the line number of the function declaration within its module
    
    Parameters:
    line - the line number of the function declaration
  - setColumnNumber
```
public void setColumnNumber(int column)
```
    Set the column number of the function declaration
    
    Parameters:
    column - the column number of the function declaration
  - getFunctionName
```
public StructuredQName getFunctionName()
```
    Get the name of the function as a structured QName
    
    Returns:
    the name of the function as a structured QName
  - getDisplayName
```
public String getDisplayName()
```
    Get the name of the function for display in error messages
    
    Returns:
    the name of the function as a lexical QName
  - getIdentificationKey
```
public SymbolicName getIdentificationKey()
```
    Get an identifying key for this function, which incorporates the URI and local part of the function name plus the arity
    
    Returns:
    an identifying key
  - getIdentificationKey
```
public static SymbolicName getIdentificationKey(StructuredQName qName,
                                int arity)
```
    Construct what the identification key would be for a function with given URI, local name, and arity
    
    Parameters:
    qName - the name of the function
    arity - the number of arguments
    
    Returns:
    an identifying key
  - getResultType
```
public SequenceType getResultType()
```
    Get the result type of the function
    
    Returns:
    the declared result type
  - setStaticContext
```
public void setStaticContext(QueryModule env)
```
    Set the static context for this function
    
    Parameters:
    env - the static context for the module in which the function is declared
  - getStaticContext
```
public StaticContext getStaticContext()
```
    Get the static context for this function
    
    Returns:
    the static context for the module in which the function is declared
  - getArgumentTypes
```
public SequenceType[] getArgumentTypes()
```
    Get the declared types of the arguments of this function
    
    Returns:
    an array, holding the types of the arguments in order
  - getParameterDefinitions
```
public UserFunctionParameter[] getParameterDefinitions()
```
    Get the definitions of the arguments to this function
    
    Returns:
    an array of UserFunctionParameter objects, one for each argument
  - getNumberOfArguments
```
public int getNumberOfArguments()
```
    Get the arity of the function
    
    Returns:
    the arity (the number of arguments)
  - registerReference
```
public void registerReference(UserFunctionReference ufc)
```
    Register a call on this function
    
    Parameters:
    ufc - a user function call that references this function.
  - setMemoFunction
```
public void setMemoFunction(boolean isMemoFunction)
```
    Set that this is, or is not, a memo function. A memo function remembers the results of calls on the function so that the a subsequent call with the same arguments simply look up the result
    
    Parameters:
    isMemoFunction - true if this is a memo function.
  - isMemoFunction
```
public boolean isMemoFunction()
```
    Find out whether this is a memo function
    
    Returns:
    true if this is a memo function
  - setUpdating
```
public void setUpdating(boolean isUpdating)
```
    Set whether this is an updating function (as defined in XQuery Update)
    
    Parameters:
    isUpdating - true if this is an updating function
  - isUpdating
```
public boolean isUpdating()
```
    Ask whether this is an updating function (as defined in XQuery Update)
    
    Returns:
    true if this is an updating function
  - setAnnotations
```
public void setAnnotations(Map<StructuredQName,Annotation> annotations)
```
    Set the annotations on this function
    
    Parameters:
    annotations - the annotations, indexed by annotation name
  - isPrivate
```
public boolean isPrivate()
```
    Ask whether this is a private function (as defined in XQuery 3.0)
    
    Returns:
    true if this is a private function
  - compile
```
public void compile()
             throws XPathException
```
    Compile this function to create a run-time definition that can be interpreted (note, this has nothing to do with Java code generation)
    
    Throws:
    
    XPathException - if errors are found
  - optimize
```
public void optimize()
              throws XPathException
```
    Optimize the body of this function
    
    Throws:
    
    XPathException - if execution fails, for example because the function is updating and contains constructs not allowed in an updating function, or vice-versa.
  - fixupReferences
```
public void fixupReferences()
                     throws XPathException
```
    Fix up references to this function
    
    Throws:
    
    XPathException
  - checkReferences
```
public void checkReferences(ExpressionVisitor visitor)
                     throws XPathException
```
    Type-check references to this function
    
    Parameters:
    visitor - the expression visitor
    
    Throws:
    
    XPathException
  - explain
```
public void explain(ExpressionPresenter out)
```
    Produce diagnostic output showing the compiled and optimized expression tree for a function
    
    Parameters:
    out - the destination to be used
  - getUserFunction
```
public UserFunction getUserFunction()
```
    Get the callable compiled function contained within this XQueryFunction definition.
    
    Returns:
    the compiled function object
  - getConstructType
```
public int getConstructType()
```
    Get the type of construct. This will be a constant in class Location.
    
    Specified by:
    
    getConstructType in interface InstructionInfo
    
    Returns:
    an integer identifying the kind of construct
  - getObjectName
```
public StructuredQName getObjectName()
```
    Get a name identifying the object of the expression, for example a function name, template name, variable name, key name, element name, etc. This is used only where the name is known statically.
    
    Specified by:
    
    getObjectName in interface InstructionInfo
    
    Returns:
    the QName of the object declared or manipulated by this instruction or expression
  - getSystemId
```
public String getSystemId()
```
    Get the system identifier (URI) of the source module containing the instruction. This will generally be an absolute URI. If the system identifier is not known, the method may return null. In some cases, for example where XML external entities are used, the correct system identifier is not always retained.
    
    Specified by:
    
    getSystemId in interface SourceLocator
    
    Specified by:
    
    getSystemId in interface InstructionInfo
    
    Returns:
    the URI of the containing module
  - getLineNumber
```
public int getLineNumber()
```
    Get the line number of the instruction in the source stylesheet module. If this is not known, or if the instruction is an artificial one that does not relate to anything in the source code, the value returned may be -1.
    
    Specified by:
    
    getLineNumber in interface SourceLocator
    
    Specified by:
    
    getLineNumber in interface InstructionInfo
    
    Returns:
    the line number of the expression within the containing module
  - getPublicId
```
public String getPublicId()
```
    Return the public identifier for the current document event.
    
    Specified by:
    
    getPublicId in interface SourceLocator
    
    Returns:
    A string containing the public identifier, or null if none is available.
    See Also:
    getSystemId()
  - getColumnNumber
```
public int getColumnNumber()
```
    Return the column number
    
    Specified by:
    
    getColumnNumber in interface SourceLocator
    
    Returns:
    The column number, or -1 if none is available.
    See Also:
    getLineNumber()
  - getNamespaceResolver
```
public NamespaceResolver getNamespaceResolver()
```
    Get the namespace context of the instruction. This will not always be available, in which case the method returns null.
  - getProperty
```
public Object getProperty(String name)
```
    Get the value of a particular property of the instruction. Properties of XSLT instructions are generally known by the name of the stylesheet attribute that defines them.
    
    Specified by:
    
    getProperty in interface InstructionInfo
    
    Parameters:
    name - The name of the required property
    
    Returns:
    The value of the requested property, or null if the property is not available
  - getProperties
```
public Iterator getProperties()
```
    Get an iterator over all the properties available. The values returned by the iterator will be of type String, and each string can be supplied as input to the getProperty() method to retrieve the value of the property.
    
    Specified by:
    
    getProperties in interface InstructionInfo
    
    Returns:
    an iterator over the properties.
  - getHostLanguage
```
public int getHostLanguage()
```
    Get the host language (XSLT, XQuery, XPath) used to implement the code in this container
    
    Specified by:
    
    getHostLanguage in interface Container
    
    Returns:
    typically Configuration.XSLT or Configuration.XQUERY

Class XQueryFunction

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

XQueryFunction

Method Detail

getConfiguration

getPackageData

getContainerGranularity

setFunctionName

addArgument

setResultType

setBody

getBody

setSystemId

setLineNumber

setColumnNumber

getFunctionName

getDisplayName

getIdentificationKey

getIdentificationKey

getResultType

setStaticContext

getStaticContext

getArgumentTypes

getParameterDefinitions

getNumberOfArguments

registerReference

setMemoFunction

isMemoFunction

setUpdating

isUpdating

setAnnotations

isPrivate

compile

optimize

fixupReferences

checkReferences

explain

getUserFunction

getConstructType

getObjectName

getSystemId

getLineNumber

getPublicId

getColumnNumber

getNamespaceResolver

getProperty

getProperties

getHostLanguage