public class

ReflectionHelper

extends Object
java.lang.Object
   ↳ org.springframework.expression.spel.support.ReflectionHelper

Class Overview

Utility methods used by the reflection resolver code to discover the appropriate methods/constructors and fields that should be used in expressions.

Summary

Nested Classes
enum ReflectionHelper.ArgsMatchKind  
class ReflectionHelper.ArgumentsMatchInfo An instance of ArgumentsMatchInfo describes what kind of match was achieved between two sets of arguments - the set that a method/constructor is expecting and the set that are being supplied at the point of invocation. 
Public Constructors
ReflectionHelper()
Public Methods
static void convertAllArguments(TypeConverter converter, Object[] arguments, Method method)
Convert a supplied set of arguments into the requested types.
static Object[] setupArgumentsForVarargsInvocation(Class[] requiredParameterTypes, Object... args)
Package up the arguments so that they correctly match what is expected in parameterTypes.
[Expand]
Inherited Methods
From class java.lang.Object

Public Constructors

public ReflectionHelper ()

Public Methods

public static void convertAllArguments (TypeConverter converter, Object[] arguments, Method method)

Convert a supplied set of arguments into the requested types. If the parameterTypes are related to a varargs method then the final entry in the parameterTypes array is going to be an array itself whose component type should be used as the conversion target for extraneous arguments. (For example, if the parameterTypes are {Integer, String[]} and the input arguments are {Integer, boolean, float} then both the boolean and float must be converted to strings). This method does not repackage the arguments into a form suitable for the varargs invocation

Parameters
converter the converter to use for type conversions
arguments the arguments to convert to the requested parameter types
method the target Method
Throws
SpelEvaluationException if there is a problem with conversion

public static Object[] setupArgumentsForVarargsInvocation (Class[] requiredParameterTypes, Object... args)

Package up the arguments so that they correctly match what is expected in parameterTypes. For example, if parameterTypes is (int, String[]) because the second parameter was declared String... then if arguments is [1,"a","b"] then it must be repackaged as [1,new String[]{"a","b"}] in order to match the expected parameterTypes.

Parameters
requiredParameterTypes the types of the parameters for the invocation
args the arguments to be setup ready for the invocation
Returns
  • a repackaged array of arguments where any varargs setup has been done