Package org.apache.commons.jxpath.ri.compiler

Class VariableReference

java.lang.Object

org.apache.commons.jxpath.ri.compiler.Expression

org.apache.commons.jxpath.ri.compiler.VariableReference

public class VariableReference
extends Expression

An element of the compile tree holding a variable reference.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.jxpath.ri.compiler.Expression

Expression.PointerIterator, Expression.ValueIterator

Field Summary

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression

NOT_A_NUMBER, ONE, ZERO

Constructor Summary

Constructors

Constructor	Description
VariableReference(QName varName)	Constructs a new VariableReference.

Method Summary

Modifier and Type	Method	Description
Object	compute(EvalContext context)	Evaluates the expression.
boolean	computeContextDependent()	Implemented by subclasses and result is cached by isContextDependent()
Object	computeValue(EvalContext context)	Returns the value of the variable.
QName	getVariableName()	Gets the variable name.
boolean	isContextDependent()	Returns true if this expression should be re-evaluated each time the current position in the context changes.
String	toString()

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression

iterate, iteratePointers

Methods inherited from class java.lang.Object

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

Constructor Details

VariableReference

public VariableReference(QName varName)

Constructs a new VariableReference.

Parameters:

varName - variable name

Method Details

compute

public Object compute(EvalContext context)

Description copied from class: Expression

Evaluates the expression. If the result is a node set, returns the first element of the node set.

Specified by:

compute in class Expression

Parameters:

context - evaluation context

Returns:

Object

computeContextDependent

public boolean computeContextDependent()

Description copied from class: Expression

Implemented by subclasses and result is cached by isContextDependent()

Specified by:

computeContextDependent in class Expression

Returns:

calculated context-dependentness as boolean

computeValue

public Object computeValue(EvalContext context)

Returns the value of the variable.

Specified by:

computeValue in class Expression

Parameters:

context - EvalContext against which to compute the variable's value.

Returns:

Object

getVariableName

public QName getVariableName()

Gets the variable name.

Returns:

QName

isContextDependent

public boolean isContextDependent()

Description copied from class: Expression

Returns true if this expression should be re-evaluated each time the current position in the context changes.

Overrides:

isContextDependent in class Expression

Returns:

boolean

toString

public String toString()

Overrides:

toString in class Object