org.springframework.expression.spel.support
Class StandardEvaluationContext

java.lang.Object
  org.springframework.expression.spel.support.StandardEvaluationContext

All Implemented Interfaces:

EvaluationContext

public class StandardEvaluationContext
extends Object
implements EvaluationContext

Provides a default EvaluationContext implementation.

To resolve properties/methods/fields this context uses a reflection mechanism.

Since:

3.0

Author:

Andy Clement, Juergen Hoeller

Constructor Summary

StandardEvaluationContext()

StandardEvaluationContext(Object rootObject)

Method Summary

void	addConstructorResolver(ConstructorResolver resolver)
void	addMethodResolver(MethodResolver resolver)
void	addPropertyAccessor(PropertyAccessor accessor)
BeanResolver	getBeanResolver()
List<ConstructorResolver>	getConstructorResolvers()
List<MethodResolver>	getMethodResolvers()
OperatorOverloader	getOperatorOverloader()
List<PropertyAccessor>	getPropertyAccessors()
TypedValue	getRootObject()
TypeComparator	getTypeComparator()
TypeConverter	getTypeConverter()
TypeLocator	getTypeLocator()
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)

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardEvaluationContext

public StandardEvaluationContext()

StandardEvaluationContext

public StandardEvaluationContext(Object rootObject)

Method Detail

setRootObject

public void setRootObject(Object rootObject)

setRootObject

public void setRootObject(Object rootObject,
                          TypeDescriptor typeDescriptor)

getRootObject

public TypedValue getRootObject()

Specified by:

getRootObject in interface EvaluationContext

Returns:

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

addConstructorResolver

public void addConstructorResolver(ConstructorResolver resolver)

removeConstructorResolver

public boolean removeConstructorResolver(ConstructorResolver resolver)

getConstructorResolvers

public List<ConstructorResolver> getConstructorResolvers()

Specified by:

getConstructorResolvers in interface EvaluationContext

Returns:

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

setConstructorResolvers

public void setConstructorResolvers(List<ConstructorResolver> constructorResolvers)

addMethodResolver

public void addMethodResolver(MethodResolver resolver)

removeMethodResolver

public boolean removeMethodResolver(MethodResolver methodResolver)

getMethodResolvers

public List<MethodResolver> getMethodResolvers()

Specified by:

getMethodResolvers in interface EvaluationContext

Returns:

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

setBeanResolver

public void setBeanResolver(BeanResolver beanResolver)

getBeanResolver

public BeanResolver getBeanResolver()

Specified by:

getBeanResolver in interface EvaluationContext

Returns:

a bean resolver that can look up beans by name

setMethodResolvers

public void setMethodResolvers(List<MethodResolver> methodResolvers)

addPropertyAccessor

public void addPropertyAccessor(PropertyAccessor accessor)

removePropertyAccessor

public boolean removePropertyAccessor(PropertyAccessor accessor)

getPropertyAccessors

public List<PropertyAccessor> getPropertyAccessors()

Specified by:

getPropertyAccessors in interface EvaluationContext

Returns:

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

setPropertyAccessors

public void setPropertyAccessors(List<PropertyAccessor> propertyAccessors)

setTypeLocator

public void setTypeLocator(TypeLocator typeLocator)

getTypeLocator

public TypeLocator getTypeLocator()

Specified by:

getTypeLocator in interface EvaluationContext

Returns:

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

setTypeConverter

public void setTypeConverter(TypeConverter typeConverter)

getTypeConverter

public TypeConverter getTypeConverter()

Specified by:

getTypeConverter in interface EvaluationContext

Returns:

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

setTypeComparator

public void setTypeComparator(TypeComparator typeComparator)

getTypeComparator

public TypeComparator getTypeComparator()

Specified by:

getTypeComparator in interface EvaluationContext

Returns:

a type comparator for comparing pairs of objects for equality.

setOperatorOverloader

public void setOperatorOverloader(OperatorOverloader operatorOverloader)

getOperatorOverloader

public OperatorOverloader getOperatorOverloader()

Specified by:

getOperatorOverloader in interface EvaluationContext

Returns:

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

setVariable

public void setVariable(String name,
                        Object value)

Description copied from interface: EvaluationContext

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

Specified by:

setVariable in interface EvaluationContext

Parameters:

name - variable to set

value - value to be placed in the variable

setVariables

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

registerFunction

public void registerFunction(String name,
                             Method method)

lookupVariable

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

Parameters:

name - variable to lookup

Returns:

the value of the variable

registerMethodFilter

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

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.

Parameters:

type - the type for which the filter should be called

filter - a MethodFilter, or NULL to deregister a filter for the type