org.springframework.expression.spel.ast

Class VariableReference

java.lang.Object

org.springframework.expression.spel.ast.SpelNodeImpl

org.springframework.expression.spel.ast.VariableReference

All Implemented Interfaces:

SpelNode

public class VariableReference
extends SpelNodeImpl

Represents a variable reference, eg. #someVar. Note this is different to a *local* variable like $someVar

Since:

3.0

Author:

Andy Clement

Field Summary

Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

children, pos

Constructor Summary

Constructors

Constructor and Description
VariableReference(String variableName, int pos)

Method Summary

Modifier and Type	Method and Description
TypedValue	getValueInternal(ExpressionState state)
ValueRef	getValueRef(ExpressionState state)
boolean	isWritable(ExpressionState expressionState) Determine if this expression node will support a setValue() call.
void	setValue(ExpressionState state, Object value) Evaluate the expression to a node and then set the new value on that node.
String	toStringAST()

Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

getChild, getChildCount, getEndPosition, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, nextChildIs

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableReference

public VariableReference(String variableName,
                         int pos)

Method Detail

getValueRef

public ValueRef getValueRef(ExpressionState state)
                     throws SpelEvaluationException

Overrides:

getValueRef in class SpelNodeImpl

Throws:

SpelEvaluationException

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws SpelEvaluationException

Specified by:

getValueInternal in class SpelNodeImpl

Throws:

SpelEvaluationException

setValue

public void setValue(ExpressionState state,
                     Object value)
              throws SpelEvaluationException

Description copied from interface: SpelNode

Evaluate the expression to a node and then set the new value on that node. For example, if the expression evaluates to a property reference then the property will be set to the new value.

Specified by:

setValue in interface SpelNode

Overrides:

setValue in class SpelNodeImpl

Parameters:

state - the current expression state (includes the context)

value - the new value

Throws:

SpelEvaluationException

toStringAST

public String toStringAST()

Returns:

the string form of this AST node

isWritable

public boolean isWritable(ExpressionState expressionState)
                   throws SpelEvaluationException

Description copied from interface: SpelNode

Determine if this expression node will support a setValue() call.

Specified by:

isWritable in interface SpelNode

Overrides:

isWritable in class SpelNodeImpl

Parameters:

expressionState - the current expression state (includes the context)

Returns:

true if the expression node will allow setValue()

Throws:

SpelEvaluationException