Package google.registry.util

Class TypeUtils

java.lang.Object

google.registry.util.TypeUtils

public final class TypeUtils
extends Object

Utilities methods related to reflection.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	TypeUtils.TypeInstantiator<T>	A TypeToken that removes an ugly cast in the common cases of getting a known type.

Method Summary

Modifier and Type	Method	Description
static void	checkNoInheritanceRelationships(com.google.common.collect.ImmutableSet<Class<?>> resourceClasses)
static <T> Class<T>	getClassFromString(String className, Class<T> expectedSuperType)	Returns the class referred to by a fully qualified class name string.
static <T> com.google.common.collect.ImmutableMap<String,T>	getTypesafeEnumMapping(Class<T> clazz)	Aggregates enum "values" in a typesafe enum pattern into a string->field map.
static Predicate<Class<?>>	hasAnnotation(Class<? extends Annotation> annotation)	Returns a predicate that tests whether classes are annotated with the given annotation.
static <T> T	instantiate(Class<? extends T> clazz)
static <T, U> T	instantiate(Class<? extends T> clazz, U arg)	Instantiate a class with the specified constructor argument.

Methods inherited from class java.lang.Object

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

Method Details

instantiate

public static <T> T instantiate(Class<? extends T> clazz)

instantiate

public static <T,
U> T instantiate(Class<? extends T> clazz,
 U arg)

Instantiate a class with the specified constructor argument.

Because we use arg's type to look up the constructor, this only works if arg1's class is exactly the same type as the constructor argument. Subtypes are not allowed.

getClassFromString

public static <T> Class<T> getClassFromString(String className,
 Class<T> expectedSuperType)

Returns the class referred to by a fully qualified class name string.

Throws an error if the loaded class is not assignable from the expected super type class.

getTypesafeEnumMapping

public static <T>
com.google.common.collect.ImmutableMap<String,T> getTypesafeEnumMapping(Class<T> clazz)

Aggregates enum "values" in a typesafe enum pattern into a string->field map.

hasAnnotation

public static Predicate<Class<?>> hasAnnotation(Class<? extends Annotation> annotation)

Returns a predicate that tests whether classes are annotated with the given annotation.

checkNoInheritanceRelationships

public static void checkNoInheritanceRelationships(com.google.common.collect.ImmutableSet<Class<?>> resourceClasses)