org.springframework.expression

Interface EvaluationContext

All Known Implementing Classes:

MethodBasedEvaluationContext, StandardEvaluationContext

public interface EvaluationContext

Expressions are executed in an evaluation context. It is in this context that references are resolved when encountered during expression evaluation.

There is a default implementation of this EvaluationContext interface: StandardEvaluationContext which can be extended, rather than having to implement everything manually.

Since:

3.0

Author:

Andy Clement, Juergen Hoeller

Method Summary

Modifier and Type	Method and Description
BeanResolver	getBeanResolver() Return a bean resolver that can look up beans by name.
List<ConstructorResolver>	getConstructorResolvers() Return a list of resolvers that will be asked in turn to locate a constructor.
List<MethodResolver>	getMethodResolvers() Return a list of resolvers that will be asked in turn to locate a method.
OperatorOverloader	getOperatorOverloader() Return an operator overloader that may support mathematical operations between more than the standard set of types.
List<PropertyAccessor>	getPropertyAccessors() Return a list of accessors that will be asked in turn to read/write a property.
TypedValue	getRootObject() Return the default root context object against which unqualified properties/methods/etc should be resolved.
TypeComparator	getTypeComparator() Return a type comparator for comparing pairs of objects for equality.
TypeConverter	getTypeConverter() Return a type converter that can convert (or coerce) a value from one type to another.
TypeLocator	getTypeLocator() Return a type locator that can be used to find types, either by short or fully qualified name.
Object	lookupVariable(String name) Look up a named variable within this evaluation context.
void	setVariable(String name, Object value) Set a named variable within this evaluation context to a specified value.

Method Detail

getRootObject

TypedValue getRootObject()

Return the default root context object against which unqualified properties/methods/etc should be resolved. This can be overridden when evaluating an expression.

getConstructorResolvers

List<ConstructorResolver> getConstructorResolvers()

Return a list of resolvers that will be asked in turn to locate a constructor.

getMethodResolvers

List<MethodResolver> getMethodResolvers()

Return a list of resolvers that will be asked in turn to locate a method.

getPropertyAccessors

List<PropertyAccessor> getPropertyAccessors()

Return a list of accessors that will be asked in turn to read/write a property.

getTypeLocator

TypeLocator getTypeLocator()

Return a type locator that can be used to find types, either by short or fully qualified name.

getTypeConverter

TypeConverter getTypeConverter()

Return a type converter that can convert (or coerce) a value from one type to another.

getTypeComparator

TypeComparator getTypeComparator()

Return a type comparator for comparing pairs of objects for equality.

getOperatorOverloader

OperatorOverloader getOperatorOverloader()

Return an operator overloader that may support mathematical operations between more than the standard set of types.

getBeanResolver

@Nullable
BeanResolver getBeanResolver()

Return a bean resolver that can look up beans by name.

setVariable

void setVariable(String name,
                 @Nullable
                 Object value)

Set a named variable within this evaluation context to a specified value.

Parameters:

name - variable to set

value - value to be placed in the variable

lookupVariable

@Nullable
Object lookupVariable(String name)

Look up a named variable within this evaluation context.

Parameters:

name - variable to lookup

Returns:

the value of the variable, or null if not found