Spring Framework

org.springframework.expression.spel.support
Class ReflectiveMethodResolver

java.lang.Object
  extended by org.springframework.expression.spel.support.ReflectiveMethodResolver
All Implemented Interfaces:
MethodResolver

public class ReflectiveMethodResolver
extends java.lang.Object
implements MethodResolver

Reflection-based MethodResolver used by default in StandardEvaluationContext unless explicit method resolvers have been specified.

Since:
3.0
Author:
Andy Clement, Juergen Hoeller, Chris Beams
See Also:
StandardEvaluationContext.addMethodResolver(MethodResolver)

Constructor Summary
ReflectiveMethodResolver()
           
ReflectiveMethodResolver(boolean useDistance)
          This constructors allows the ReflectiveMethodResolver to be configured such that it will use a distance computation to check which is the better of two close matches (when there are multiple matches).
 
Method Summary
protected  java.lang.reflect.Method[] getMethods(java.lang.Class<?> type)
          Return the set of methods for this type.
 void registerMethodFilter(java.lang.Class<?> type, MethodFilter filter)
           
 MethodExecutor resolve(EvaluationContext context, java.lang.Object targetObject, java.lang.String name, java.util.List<TypeDescriptor> argumentTypes)
          Locate a method on a type.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ReflectiveMethodResolver

public ReflectiveMethodResolver()

ReflectiveMethodResolver

public ReflectiveMethodResolver(boolean useDistance)
This constructors allows the ReflectiveMethodResolver to be configured such that it will use a distance computation to check which is the better of two close matches (when there are multiple matches). Using the distance computation is intended to ensure matches are more closely representative of what a Java compiler would do when taking into account boxing/unboxing and whether the method candidates are declared to handle a supertype of the type (of the argument) being passed in.

Parameters:
useDistance - true if distance computation should be used when calculating matches
Method Detail

resolve

public MethodExecutor resolve(EvaluationContext context,
                              java.lang.Object targetObject,
                              java.lang.String name,
                              java.util.List<TypeDescriptor> argumentTypes)
                       throws AccessException
Locate a method on a type. There are three kinds of match that might occur:
  1. An exact match where the types of the arguments match the types of the constructor
  2. An in-exact match where the types we are looking for are subtypes of those defined on the constructor
  3. A match where we are able to convert the arguments into those expected by the constructor, according to the registered type converter.

Specified by:
resolve in interface MethodResolver
Parameters:
context - the current evaluation context
targetObject - the object upon which the method is being called
argumentTypes - the arguments that the constructor must be able to handle
Returns:
a MethodExecutor that can invoke the method, or null if the method cannot be found
Throws:
AccessException

registerMethodFilter

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

getMethods

protected java.lang.reflect.Method[] getMethods(java.lang.Class<?> type)
Return the set of methods for this type. The default implementation returns the result of Class#getMethods for the given type, but subclasses may override in order to alter the results, e.g. specifying static methods declared elsewhere.

Parameters:
type - the class for which to return the methods
Since:
3.1.1

Spring Framework