Package org.apache.commons.jexl3.introspection

Interface JexlUberspect

public interface JexlUberspect

'Federated' introspection/reflection interface to allow JEXL introspection behavior to be customized.

Since:

1.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static enum	JexlUberspect.JexlResolver	The various builtin property resolvers.
static interface	JexlUberspect.PropertyResolver	Abstracts getting property setter and getter.
static interface	JexlUberspect.ResolverStrategy	Determines property resolution strategy.

Field Summary

Fields

Modifier and Type	Field	Description
static final JexlUberspect.ResolverStrategy	JEXL_STRATEGY	The default strategy.
static final List<JexlUberspect.PropertyResolver>	MAP	A resolver types list tailored for Maps, favors '[]' over '.'.
static final JexlUberspect.ResolverStrategy	MAP_STRATEGY	The map strategy.
static final List<JexlUberspect.PropertyResolver>	POJO	A resolver types list tailored for POJOs, favors '.' over '[]'.

Method Summary

Modifier and Type	Method	Description
JexlArithmetic.Uberspect	getArithmetic(JexlArithmetic arithmetic)	Gets an arithmetic operator resolver for a given arithmetic instance.
default Class<?>	getClassByName(String className)	Seeks a class by name using this uberspect class-loader.
ClassLoader	getClassLoader()	Gets the current class loader.
JexlMethod	getConstructor(Object ctorHandle, Object... args)	Returns a class constructor.
Iterator<?>	getIterator(Object obj)	Gets an iterator from an object.
JexlMethod	getMethod(Object obj, String method, Object... args)	Returns a JexlMethod.
JexlPropertyGet	getPropertyGet(Object obj, Object identifier)	Property getter.
JexlPropertyGet	getPropertyGet(List<JexlUberspect.PropertyResolver> resolvers, Object obj, Object identifier)	Property getter.
JexlPropertySet	getPropertySet(Object obj, Object identifier, Object arg)	Property setter.
JexlPropertySet	getPropertySet(List<JexlUberspect.PropertyResolver> resolvers, Object obj, Object identifier, Object arg)	Property setter.
List<JexlUberspect.PropertyResolver>	getResolvers(JexlOperator op, Object obj)	Applies this uberspect property resolver strategy.
int	getVersion()	Gets this uberspect version.
void	setClassLoader(ClassLoader loader)	Sets the class loader to use.

Field Details

POJO

static final List<JexlUberspect.PropertyResolver> POJO

A resolver types list tailored for POJOs, favors '.' over '[]'.

MAP

static final List<JexlUberspect.PropertyResolver> MAP

A resolver types list tailored for Maps, favors '[]' over '.'.

JEXL_STRATEGY

static final JexlUberspect.ResolverStrategy JEXL_STRATEGY

The default strategy.

If the operator is '[]' or if the operator is null and the object is a map, use the MAP list of resolvers; Other cases use the POJO list of resolvers.

MAP_STRATEGY

static final JexlUberspect.ResolverStrategy MAP_STRATEGY

The map strategy.

If the operator is '[]' or if the object is a map, use the MAP list of resolvers. Otherwise, use the POJO list of resolvers.

Method Details

getArithmetic

JexlArithmetic.Uberspect getArithmetic(JexlArithmetic arithmetic)

Gets an arithmetic operator resolver for a given arithmetic instance.

Parameters:

arithmetic - the arithmetic instance

Returns:

the arithmetic uberspect or null if no operator method were overridden

Since:

3.0

getClassByName

default Class<?> getClassByName(String className)

Seeks a class by name using this uberspect class-loader.

Parameters:

className - the class name

Returns:

the class instance or null if the class cannot be located by this uberspect class loader or if permissions deny access to the class

getClassLoader

ClassLoader getClassLoader()

Gets the current class loader.

Returns:

the class loader

getConstructor

JexlMethod getConstructor(Object ctorHandle,
 Object... args)

Returns a class constructor.

Parameters:

ctorHandle - a class or class name

args - constructor arguments

Returns:

a JexlMethod

Since:

3.0

getIterator

Iterator<?> getIterator(Object obj)

Gets an iterator from an object.

Parameters:

obj - to get the iterator from

Returns:

an iterator over obj or null

getMethod

JexlMethod getMethod(Object obj,
 String method,
 Object... args)

Returns a JexlMethod.

Parameters:

obj - the object

method - the method name

args - method arguments

Returns:

a JexlMethod

getPropertyGet

JexlPropertyGet getPropertyGet(List<JexlUberspect.PropertyResolver> resolvers,
 Object obj,
 Object identifier)

Property getter.

Seeks a JexlPropertyGet apropos to an expression like bar.woogie.

See JexlUberspect.ResolverStrategy.apply(JexlOperator, java.lang.Object)

Parameters:

resolvers - the list of property resolvers to try

obj - the object to get the property from

identifier - property name

Returns:

a JexlPropertyGet or null

Since:

3.0

getPropertyGet

JexlPropertyGet getPropertyGet(Object obj,
 Object identifier)

Property getter.

returns a JelPropertySet apropos to an expression like bar.woogie.

Parameters:

obj - the object to get the property from

identifier - property name

Returns:

a JexlPropertyGet or null

getPropertySet

JexlPropertySet getPropertySet(List<JexlUberspect.PropertyResolver> resolvers,
 Object obj,
 Object identifier,
 Object arg)

Property setter.

Seeks a JelPropertySet apropos to an expression like foo.bar = "geir".

See JexlUberspect.ResolverStrategy.apply(JexlOperator, java.lang.Object)

Parameters:

resolvers - the list of property resolvers to try,

obj - the object to get the property from

identifier - property name

arg - value to set

Returns:

a JexlPropertySet or null

Since:

3.0

getPropertySet

JexlPropertySet getPropertySet(Object obj,
 Object identifier,
 Object arg)

Property setter.

Seeks a JelPropertySet apropos to an expression like foo.bar = "geir".

Parameters:

obj - the object to get the property from.

identifier - property name

arg - value to set

Returns:

a JexlPropertySet or null

getResolvers

List<JexlUberspect.PropertyResolver> getResolvers(JexlOperator op,
 Object obj)

Applies this uberspect property resolver strategy.

Parameters:

op - the operator

obj - the object

Returns:

the applied strategy resolver list

getVersion

int getVersion()

Gets this uberspect version.

Returns:

the class loader modification count

setClassLoader

void setClassLoader(ClassLoader loader)

Sets the class loader to use.

This increments the version.

Parameters:

loader - the class loader