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, Sebastien Deleuze

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class StandardEvaluationContext

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

Methods inherited from class Object

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

Methods inherited from interface EvaluationContext

assignVariable, isAssignmentEnabled

Constructor Details

MethodBasedEvaluationContext

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

Method Details

lookupVariable

public @Nullable Object lookupVariable(String name)

Description copied from class: StandardEvaluationContext

Look up a named variable or function within this evaluation context.

Note that variables and functions share a common namespace in this evaluation context. See the class-level documentation for details.

Specified by:

lookupVariable in interface EvaluationContext

Overrides:

lookupVariable in class StandardEvaluationContext

Parameters:

name - the name of the variable or function to look up

Returns:

the value of the variable or function, or null if not found

lazyLoadArguments

protected void lazyLoadArguments()

Load the param information only when needed.