org.springframework.expression.spel.ast
Class FunctionReference

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

All Implemented Interfaces:

SpelNode

public class FunctionReference
extends SpelNodeImpl

A function reference is of the form "#someFunction(a,b,c)". Functions may be defined in the context prior to the expression being evaluated or within the expression itself using a lambda function definition. For example: Lambda function definition in an expression: "(#max = {|x,y|$x>$y?$x:$y};max(2,3))" Calling context defined function: "#isEven(37)". Functions may also be static java methods, registered in the context prior to invocation of the expression.

Functions are very simplistic, the arguments are not part of the definition (right now), so the names must be unique.

Since:

3.0

Author:

Andy Clement

Field Summary

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

children, pos

Constructor Summary

FunctionReference(String functionName, int pos, SpelNodeImpl... arguments)

Method Summary

TypedValue	getValueInternal(ExpressionState state)
String	toStringAST()

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionReference

public FunctionReference(String functionName,
                         int pos,
                         SpelNodeImpl... arguments)

Method Detail

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException

Specified by:

getValueInternal in class SpelNodeImpl

Throws:

EvaluationException

toStringAST

public String toStringAST()

Specified by:

toStringAST in interface SpelNode

Specified by:

toStringAST in class SpelNodeImpl

Returns:

the string form of this AST node