ru.vyarus.java.generics.resolver.util

Class GenericsUtils

java.lang.Object

ru.vyarus.java.generics.resolver.util.GenericsUtils

public final class GenericsUtils
extends java.lang.Object

Helper utilities to correctly resolve generified types of super interfaces.

Since:

17.10.2014

Method Summary

Modifier and Type	Method and Description
static java.util.List<java.lang.Class<?>>	getMethodParameters(java.lang.reflect.Method method, java.util.Map<java.lang.String,java.lang.reflect.Type> generics) Resolve generics in method parameters.
static java.lang.Class<?>	getReturnClass(java.lang.reflect.Method method, java.util.Map<java.lang.String,java.lang.reflect.Type> generics) Called to properly resolve return type of root finder or inherited finder method.
static java.lang.Class<?>	resolveClass(java.lang.reflect.Type type, java.util.Map<java.lang.String,java.lang.reflect.Type> generics) Resolves top class for provided type (for example, for generified classes like List<T> it returns base type List).
static java.util.List<java.lang.Class<?>>	resolveGenericsOf(java.lang.reflect.Type type, java.util.Map<java.lang.String,java.lang.reflect.Type> generics) Called to properly resolve generified type (e.g. generified method return).

Methods inherited from class java.lang.Object

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

Method Detail

getReturnClass

public static java.lang.Class<?> getReturnClass(java.lang.reflect.Method method,
                                                java.util.Map<java.lang.String,java.lang.reflect.Type> generics)

Called to properly resolve return type of root finder or inherited finder method. Supposed to return enough type info to detect return type (collection, array or plain object).

Parameters:

method - method to analyze

generics - generics resolution map for method class (will be null for root)

Returns:

return type class

getMethodParameters

public static java.util.List<java.lang.Class<?>> getMethodParameters(java.lang.reflect.Method method,
                                                                     java.util.Map<java.lang.String,java.lang.reflect.Type> generics)

Resolve generics in method parameters.

Parameters:

method - method to resolve parameters

generics - type generics

Returns:

resolved method parameter types

resolveGenericsOf

public static java.util.List<java.lang.Class<?>> resolveGenericsOf(java.lang.reflect.Type type,
                                                                   java.util.Map<java.lang.String,java.lang.reflect.Type> generics)
                                                            throws NoGenericException

Called to properly resolve generified type (e.g. generified method return). For example, when calling for List<T> it will return type of T.

Parameters:

type - type to analyze

generics - root class generics mapping

Returns:

resolved generic classes

Throws:

NoGenericException - when generic not found or not generified type provided

UnknownGenericException - when found generic not declared on type (e.g. method generic)

resolveClass

public static java.lang.Class<?> resolveClass(java.lang.reflect.Type type,
                                              java.util.Map<java.lang.String,java.lang.reflect.Type> generics)

Resolves top class for provided type (for example, for generified classes like List<T> it returns base type List).

Parameters:

type - type to resolve

generics - root class generics mapping

Returns:

resolved class

Throws:

UnknownGenericException - when found generic not declared on type (e.g. method generic)