程序包 cn.taketoday.expression.spel.support

类 StandardEvaluationContext

java.lang.Object

cn.taketoday.expression.spel.support.StandardEvaluationContext

所有已实现的接口:

EvaluationContext

public class StandardEvaluationContext
extends Object
implements EvaluationContext

A powerful and highly configurable EvaluationContext implementation. This context uses standard implementations of all applicable strategies, based on reflection to resolve properties, methods and fields.

For a simpler builder-style context variant for data-binding purposes, consider using SimpleEvaluationContext instead which allows for opting into several SpEL features as needed by specific evaluation cases.

从以下版本开始:

4.0

作者:

Andy Clement, Juergen Hoeller, Sam Brannen

另请参阅:

• SimpleEvaluationContext
• ReflectivePropertyAccessor
• ReflectiveConstructorResolver
• ReflectiveMethodResolver
• StandardTypeLocator
• StandardTypeConverter
• StandardTypeComparator
• StandardOperatorOverloader

构造器概要

构造器

构造器	说明
StandardEvaluationContext()	Create a StandardEvaluationContext with a null root object.
StandardEvaluationContext(Object rootObject)	Create a StandardEvaluationContext with the given root object.

方法概要

修饰符和类型	方法	说明
void	addConstructorResolver(ConstructorResolver resolver)
void	addMethodResolver(MethodResolver resolver)
void	addPropertyAccessor(PropertyAccessor accessor)
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	registerFunction(String name, Method method)
void	registerMethodFilter(Class<?> type, MethodFilter filter)	Register a MethodFilter which will be called during method resolution for the specified type.
boolean	removeConstructorResolver(ConstructorResolver resolver)
boolean	removeMethodResolver(MethodResolver methodResolver)
boolean	removePropertyAccessor(PropertyAccessor accessor)
void	setBeanResolver(BeanResolver beanResolver)
void	setConstructorResolvers(List<ConstructorResolver> constructorResolvers)
void	setMethodResolvers(List<MethodResolver> methodResolvers)
void	setOperatorOverloader(OperatorOverloader operatorOverloader)
void	setPropertyAccessors(List<PropertyAccessor> propertyAccessors)
void	setRootObject(Object rootObject)
void	setRootObject(Object rootObject, TypeDescriptor typeDescriptor)
void	setTypeComparator(TypeComparator typeComparator)
void	setTypeConverter(TypeConverter typeConverter)
void	setTypeLocator(TypeLocator typeLocator)
void	setVariable(String name, Object value)	Set a named variable within this evaluation context to a specified value.
void	setVariables(Map<String,Object> variables)

从类继承的方法 java.lang.Object

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

构造器详细资料

StandardEvaluationContext

public StandardEvaluationContext()

Create a StandardEvaluationContext with a null root object.

StandardEvaluationContext

public StandardEvaluationContext(@Nullable
 Object rootObject)

Create a StandardEvaluationContext with the given root object.

参数:

rootObject - the root object to use

另请参阅:

• setRootObject(java.lang.Object, cn.taketoday.core.TypeDescriptor)

方法详细资料

setRootObject

public void setRootObject(@Nullable
 Object rootObject,
 TypeDescriptor typeDescriptor)

setRootObject

public void setRootObject(@Nullable
 Object rootObject)

getRootObject

public TypedValue getRootObject()

从接口复制的说明: EvaluationContext

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

指定者:

getRootObject 在接口中 EvaluationContext

setPropertyAccessors

public void setPropertyAccessors(List<PropertyAccessor> propertyAccessors)

getPropertyAccessors

public List<PropertyAccessor> getPropertyAccessors()

从接口复制的说明: EvaluationContext

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

指定者:

getPropertyAccessors 在接口中 EvaluationContext

addPropertyAccessor

public void addPropertyAccessor(PropertyAccessor accessor)

removePropertyAccessor

public boolean removePropertyAccessor(PropertyAccessor accessor)

setConstructorResolvers

public void setConstructorResolvers(List<ConstructorResolver> constructorResolvers)

getConstructorResolvers

public List<ConstructorResolver> getConstructorResolvers()

从接口复制的说明: EvaluationContext

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

指定者:

getConstructorResolvers 在接口中 EvaluationContext

addConstructorResolver

public void addConstructorResolver(ConstructorResolver resolver)

removeConstructorResolver

public boolean removeConstructorResolver(ConstructorResolver resolver)

setMethodResolvers

public void setMethodResolvers(List<MethodResolver> methodResolvers)

getMethodResolvers

public List<MethodResolver> getMethodResolvers()

从接口复制的说明: EvaluationContext

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

指定者:

getMethodResolvers 在接口中 EvaluationContext

addMethodResolver

public void addMethodResolver(MethodResolver resolver)

removeMethodResolver

public boolean removeMethodResolver(MethodResolver methodResolver)

setBeanResolver

public void setBeanResolver(BeanResolver beanResolver)

getBeanResolver

@Nullable
public BeanResolver getBeanResolver()

从接口复制的说明: EvaluationContext

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

指定者:

getBeanResolver 在接口中 EvaluationContext

setTypeLocator

public void setTypeLocator(TypeLocator typeLocator)

getTypeLocator

public TypeLocator getTypeLocator()

从接口复制的说明: EvaluationContext

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

指定者:

getTypeLocator 在接口中 EvaluationContext

setTypeConverter

public void setTypeConverter(TypeConverter typeConverter)

getTypeConverter

public TypeConverter getTypeConverter()

从接口复制的说明: EvaluationContext

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

指定者:

getTypeConverter 在接口中 EvaluationContext

setTypeComparator

public void setTypeComparator(TypeComparator typeComparator)

getTypeComparator

public TypeComparator getTypeComparator()

从接口复制的说明: EvaluationContext

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

指定者:

getTypeComparator 在接口中 EvaluationContext

setOperatorOverloader

public void setOperatorOverloader(OperatorOverloader operatorOverloader)

getOperatorOverloader

public OperatorOverloader getOperatorOverloader()

从接口复制的说明: EvaluationContext

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

指定者:

getOperatorOverloader 在接口中 EvaluationContext

setVariable

public void setVariable(@Nullable
 String name,
 @Nullable
 Object value)

从接口复制的说明: EvaluationContext

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

指定者:

setVariable 在接口中 EvaluationContext

参数:

name - the name of the variable to set

value - the value to be placed in the variable

setVariables

public void setVariables(Map<String,Object> variables)

registerFunction

public void registerFunction(String name,
 Method method)

lookupVariable

@Nullable
public Object lookupVariable(String name)

从接口复制的说明: EvaluationContext

Look up a named variable within this evaluation context.

指定者:

lookupVariable 在接口中 EvaluationContext

参数:

name - variable to lookup

返回:

the value of the variable, or null if not found

registerMethodFilter

public void registerMethodFilter(Class<?> type,
 MethodFilter filter)
                          throws IllegalStateException

Register a MethodFilter which will be called during method resolution for the specified type.

The MethodFilter may remove methods and/or sort the methods which will then be used by SpEL as the candidates to look through for a match.

参数:

type - the type for which the filter should be called

filter - a MethodFilter, or null to unregister a filter for the type

抛出:

IllegalStateException - if the ReflectiveMethodResolver is not in use