net.sf.saxon.query

Class GlobalVariableDefinition

java.lang.Object

net.sf.saxon.query.GlobalVariableDefinition

All Implemented Interfaces:

SourceLocator, VariableDeclaration, Declaration

Direct Known Subclasses:

UndeclaredVariable

public class GlobalVariableDefinition
extends Object
implements VariableDeclaration, Declaration

Class to hold compile-time information about an XQuery global variable or parameter

Field Summary

Fields

Modifier and Type	Field and Description
protected List	references

Constructor Summary

Constructors

Constructor and Description
GlobalVariableDefinition()

Method Summary

Modifier and Type	Method and Description
GlobalVariable	compile(StaticQueryContext env, int slot) Create a compiled representation of this global variable
void	explain(Configuration config) Produce diagnostic output showing the compiled and optimized expression tree for a function
int	getColumnNumber() Get column number
GlobalVariable	getCompiledVariable() Get the compiled variable if the definition has been compiled
int	getLineNumber() Get the line number where the declaration appears
int	getNameCode() Get the variable name
String	getPublicId() Get public identifier
SequenceType	getRequiredType() Get the required type of the variable
String	getSystemId() Get the system ID of the module containing the variable declaration
String	getVariableName() Get the name of the variable
Iterator	iterateReferences() Iterate over the references to this variable
void	registerReference(BindingReference ref) Register a variable reference that refers to this global variable
void	setIsParameter(boolean b) Indicate whether this global variable is a "parameter" (an external variable, in XQuery terminology)
void	setLineNumber(int lineNumber) Set the line number where the variable declaration appears in the source
void	setNameCode(int nameCode) Set the variable name
void	setRequiredType(SequenceType type) Set the required type of the variable
void	setSystemId(String systemId) Set the system ID of the module where the variable declaration appears
void	setValueExpression(Expression val) Set the expression used to define the value of the variable
void	setVariableName(String variableName) Set the variable name
static void	typeCheck(StaticQueryContext env, GeneralVariable var) Type check the compiled representation of this global variable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

references

protected List references

Constructor Detail

GlobalVariableDefinition

public GlobalVariableDefinition()

Method Detail

setRequiredType

public void setRequiredType(SequenceType type)

Set the required type of the variable

Parameters:

type - the declared type, from the "as" clause if present

getRequiredType

public SequenceType getRequiredType()

Get the required type of the variable

Returns:

the declared type, from the "as" clause if present

setNameCode

public void setNameCode(int nameCode)

Set the variable name

Parameters:

nameCode - the variable name, expressed as a NamePool name code

getNameCode

public int getNameCode()

Get the variable name

Specified by:

getNameCode in interface VariableDeclaration

Returns:

the variable name, expressed as a NamePool name code

setLineNumber

public void setLineNumber(int lineNumber)

Set the line number where the variable declaration appears in the source

Parameters:

lineNumber - the line number

getLineNumber

public int getLineNumber()

Get the line number where the declaration appears

Specified by:

getLineNumber in interface SourceLocator

getColumnNumber

public int getColumnNumber()

Get column number

Specified by:

getColumnNumber in interface SourceLocator

Returns:

-1 always

getPublicId

public String getPublicId()

Get public identifier

Specified by:

getPublicId in interface SourceLocator

Returns:

null always

setSystemId

public void setSystemId(String systemId)

Set the system ID of the module where the variable declaration appears

getSystemId

public String getSystemId()

Get the system ID of the module containing the variable declaration

Specified by:

getSystemId in interface SourceLocator

getVariableName

public String getVariableName()

Get the name of the variable

Specified by:

getVariableName in interface VariableDeclaration

Returns:

the variable name, as a lexical QName

setVariableName

public void setVariableName(String variableName)

Set the variable name

Parameters:

variableName - the variable name, as a lexical QName

setValueExpression

public void setValueExpression(Expression val)

Set the expression used to define the value of the variable

Parameters:

val - the initializing expression

setIsParameter

public void setIsParameter(boolean b)

Indicate whether this global variable is a "parameter" (an external variable, in XQuery terminology)

Parameters:

b - true if this variable is external

registerReference

public void registerReference(BindingReference ref)

Register a variable reference that refers to this global variable

Specified by:

registerReference in interface VariableDeclaration

Parameters:

ref - the variable reference

iterateReferences

public Iterator iterateReferences()

Iterate over the references to this variable

compile

public GlobalVariable compile(StaticQueryContext env,
                              int slot)
                       throws XPathException

Create a compiled representation of this global variable

Parameters:

env - the static context for the query module

slot - the slot number allocated to this variable

Returns:

the compiled representation

Throws:

XPathException - if compile-time errors are found.

typeCheck

public static void typeCheck(StaticQueryContext env,
                             GeneralVariable var)
                      throws XPathException

Type check the compiled representation of this global variable

Parameters:

env - the static context for the query module

Throws:

XPathException - if compile-time errors are found.

getCompiledVariable

public GlobalVariable getCompiledVariable()

Get the compiled variable if the definition has been compiled

explain

public void explain(Configuration config)

Produce diagnostic output showing the compiled and optimized expression tree for a function

Parameters:

config - the configuration to be used