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## 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. Also used for system-generated global variables created by the optimizer, whether in XSLT or XQuery.

Field Summary
`protected List` | `references`

Constructor Summary
`GlobalVariableDefinition()`

Method Summary
`GlobalVariable` | `compile(Executable exec, int slot)` Create a compiled representation of this global variable
`void` | `explain(ExpressionPresenter out)` 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
`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
`Expression` | `getValueExpression()` Get the expression used to initialize the value of the variable
`StructuredQName` | `getVariableQName()` Get the variable name
`boolean` | `isParameter()` Ask whether this global variable is a "parameter" (an external variable, in XQuery terminology)
`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)` Say 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` | `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` | `setVariableQName(StructuredQName qName)` Set the variable name
`void` | `typeCheck(ExpressionVisitor visitor)` 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

### setVariableQName

    public void setVariableQName(StructuredQName qName)

  Set the variable name

  Parameters:
    `qName` - the variable name

### getVariableQName

    public StructuredQName getVariableQName()

  Get the variable name

  Specified by:
    `getVariableQName` in interface `VariableDeclaration`
  Returns:
    the variable name

### 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

  Parameters:
    `systemId` - the System ID (base URI)

### getSystemId

    public String getSystemId()

  Get the system ID of the module containing the variable declaration

  Specified by:
    `getSystemId` in interface `SourceLocator`
  Returns:
    the System ID (base URI)

### setValueExpression

    public void setValueExpression(Expression val)

  Set the expression used to define the value of the variable

  Parameters:
    `val` - the initializing expression

### getValueExpression

    public Expression getValueExpression()

  Get the expression used to initialize the value of the variable

  Returns:
    the initializing expression

### setIsParameter

    public void setIsParameter(boolean b)

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

  Parameters:
    `b` - true if this variable is external

### isParameter

    public boolean isParameter()

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

  Returns:
    true if this variable is an external variable

### 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

  Returns:
    an iterator over the references: returns objects of class `VariableReference`

### compile

    public GlobalVariable compile(Executable exec,
                                  int slot)
                           throws XPathException

  Create a compiled representation of this global variable

  Parameters:
    `exec` - the executable
    `slot` - the slot number allocated to this variable
  Returns:
    the compiled representation
  Throws:
    `XPathException` - if compile-time errors are found.

### typeCheck

    public void typeCheck(ExpressionVisitor visitor)
                   throws XPathException

  Type check the compiled representation of this global variable

  Parameters:
    `visitor` - an expression visitor
  Throws:
    `XPathException` - if compile-time errors are found.

### getCompiledVariable

    public GlobalVariable getCompiledVariable()

  Get the compiled variable if the definition has been compiled

  Returns:
    the compiled global variable

### 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

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