com.espertech.esper.util

Class MethodResolver

java.lang.Object

com.espertech.esper.util.MethodResolver

public class MethodResolver
extends Object

Used for retrieving static and instance method objects. It provides two points of added functionality over the standard java.lang.reflect mechanism of retrieving methods. First, class names can be partial, and if the class name is partial then java.lang is searched for the class. Second, invocation parameter types don't have to match the declaration parameter types exactly when the standard java conversion mechanisms (currently autoboxing and widening conversions) will make the invocation valid. Preference is given to those methods that require the fewest widening conversions.

Constructor Summary

Constructors

Constructor and Description
MethodResolver()

Method Summary

Modifier and Type	Method and Description
static Map<Class,Set<Class>>	getWideningConversions() Returns the allowable widening conversions.
static Constructor	resolveCtor(Class declaringClass, Class[] paramTypes)
static Method	resolveMethod(Class declaringClass, String methodName, Class[] paramTypes, boolean allowInstance, boolean[] allowEventBeanType, boolean[] allowEventBeanCollType) Attempts to find the static or instance method described by the parameters, or a method of the same name that will accept the same type of parameters.

Methods inherited from class java.lang.Object

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

Constructor Detail

MethodResolver

public MethodResolver()

Method Detail

getWideningConversions

public static Map<Class,Set<Class>> getWideningConversions()

Returns the allowable widening conversions.

Returns:

map where key is the class that we are asking to be widened into, and a set of classes that can be widened from

resolveMethod

public static Method resolveMethod(Class declaringClass,
                                   String methodName,
                                   Class[] paramTypes,
                                   boolean allowInstance,
                                   boolean[] allowEventBeanType,
                                   boolean[] allowEventBeanCollType)
                            throws EngineNoSuchMethodException

Attempts to find the static or instance method described by the parameters, or a method of the same name that will accept the same type of parameters.

Parameters:

declaringClass - - the class to search for the method

methodName - - the name of the method

paramTypes - - the parameter types for the method

allowInstance - - true to allow instance methods as well, false to allow only static method

allowEventBeanCollType - whether event-bean-collection parameter type is allowed

allowEventBeanType - whether event-bean parameter type is allowed

Returns:

- the Method object for this method

Throws:

EngineNoSuchMethodException - if the method could not be found

resolveCtor

public static Constructor resolveCtor(Class declaringClass,
                                      Class[] paramTypes)
                               throws EngineNoSuchCtorException

Throws:

EngineNoSuchCtorException