Package org.springframework.context.expression

Class MethodBasedEvaluationContext

java.lang.Object

org.springframework.expression.spel.support.StandardEvaluationContext

org.springframework.context.expression.MethodBasedEvaluationContext

All Implemented Interfaces:

EvaluationContext

public class MethodBasedEvaluationContext
extends StandardEvaluationContext

A method-based EvaluationContext that provides explicit support for method-based invocations.

Expose the actual method arguments using the following aliases:

1. pX where X is the index of the argument (p0 for the first argument)
2. aX where X is the index of the argument (a1 for the second argument)
3. the name of the parameter as discovered by a configurable ParameterNameDiscoverer

Since:

4.2

Author:

Stephane Nicoll, Juergen Hoeller

Constructor Summary

Constructors

Constructor	Description
MethodBasedEvaluationContext(Object rootObject, Method method, Object[] arguments, ParameterNameDiscoverer parameterNameDiscoverer)

Method Summary

Modifier and Type	Method	Description
protected void	lazyLoadArguments()	Load the param information only when needed.
Object	lookupVariable(String name)	Look up a named variable within this evaluation context.

Methods inherited from class org.springframework.expression.spel.support.StandardEvaluationContext

addConstructorResolver, addMethodResolver, addPropertyAccessor, getBeanResolver, getConstructorResolvers, getMethodResolvers, getOperatorOverloader, getPropertyAccessors, getRootObject, getTypeComparator, getTypeConverter, getTypeLocator, registerFunction, registerMethodFilter, removeConstructorResolver, removeMethodResolver, removePropertyAccessor, setBeanResolver, setConstructorResolvers, setMethodResolvers, setOperatorOverloader, setPropertyAccessors, setRootObject, setRootObject, setTypeComparator, setTypeConverter, setTypeLocator, setVariable, setVariables

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.expression.EvaluationContext

assignVariable, isAssignmentEnabled

Constructor Details

MethodBasedEvaluationContext

public MethodBasedEvaluationContext(Object rootObject,
 Method method,
 Object[] arguments,
 ParameterNameDiscoverer parameterNameDiscoverer)

Method Details

lookupVariable

@Nullable
public Object lookupVariable(String name)

Description copied from interface: EvaluationContext

Look up a named variable within this evaluation context.

Specified by:

lookupVariable in interface EvaluationContext

Overrides:

lookupVariable in class StandardEvaluationContext

Parameters:

name - the name of the variable to look up

Returns:

the value of the variable, or null if not found

lazyLoadArguments

protected void lazyLoadArguments()

Load the param information only when needed.