org.springframework.expression.spel.ast
Class CompoundExpression

java.lang.Object
  org.springframework.expression.spel.ast.SpelNodeImpl
      org.springframework.expression.spel.ast.CompoundExpression

All Implemented Interfaces:

SpelNode

public class CompoundExpression
extends SpelNodeImpl

Represents a DOT separated expression sequence, such as 'property1.property2.methodOne()'

Since:

3.0

Author:

Andy Clement

Field Summary

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

children, pos

Constructor Summary

CompoundExpression(int pos, SpelNodeImpl... expressionComponents)

Method Summary

TypedValue	getValueInternal(ExpressionState state) Evalutes a compound expression.
boolean	isWritable(ExpressionState state) 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

CompoundExpression

public CompoundExpression(int pos,
                          SpelNodeImpl... expressionComponents)

Method Detail

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException

Evalutes a compound expression. This involves evaluating each piece in turn and the return value from each piece is the active context object for the subsequent piece.

Specified by:

getValueInternal in class SpelNodeImpl

Parameters:

state - the state in which the expression is being evaluated

Returns:

the final value from the last piece of the compound expression

Throws:

EvaluationException

setValue

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

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:

EvaluationException - if any problem occurs evaluating the expression or setting the new value

isWritable

public boolean isWritable(ExpressionState state)
                   throws EvaluationException

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:

state - the current expression state (includes the context)

Returns:

true if the expression node will allow setValue()

Throws:

EvaluationException - if something went wrong trying to determine if the node supports writing

toStringAST

public String toStringAST()

Specified by:

toStringAST in interface SpelNode

Specified by:

toStringAST in class SpelNodeImpl

Returns:

the string form of this AST node