io.leangen.graphql.util

Class ClassUtils

java.lang.Object

io.leangen.graphql.util.ClassUtils

public class ClassUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
ClassUtils()

Method Summary

Modifier and Type	Method and Description
static <T extends AnnotatedType> T	addAnnotations(T type, Annotation[] annotations)
static AnnotatedType	completeGenerics(AnnotatedType type, AnnotatedType replacement)
static boolean	containsTypeAnnotation(AnnotatedType type, Class<? extends Annotation> annotation)
static AnnotatedType	eraseBounds(AnnotatedType type, AnnotatedType replacement) Recursively replaces all bounded types found within the structure of the given AnnotatedType with their first bound.
static Optional<Field>	findField(Class<?> type, String fieldName)
static Optional<Field>	findFieldByGetter(Method getter)
static Optional<Field>	findFieldBySetter(Method setter)
static Optional<Method>	findGetter(Class<?> type, String fieldName)
static List<AnnotatedType>	findImplementations(AnnotatedType superType, String... packages) Deprecated. Use ClassFinder directly as that enables caching of the search results
static List<Class<?>>	findImplementations(Class superType, String... packages) Deprecated. Use ClassFinder directly as that enables caching of the search results
static Optional<Method>	findMethod(Class<?> type, String methodName, Class<?>... parameterTypes)
static Optional<Method>	findSetter(Class<?> type, String fieldName, Class<?> fieldType)
static Class<?>	forName(String className)
static Annotation[]	getAllAnnotations(Stream<AnnotatedType> types)
static Set<Field>	getAnnotatedFields(Class<?> type, Class<? extends Annotation> annotation) Retrieves all public fields on the given class (same as Class.getFields()) annotated by the given annotation
static Set<Method>	getAnnotatedMethods(Class<?> type, Class<? extends Annotation> annotation) Retrieves all public methods on the given class (same as Class.getMethods()) annotated by the given annotation
static <T extends Annotation> T	getAnnotation(Method method, Class<T> annotation)
static List<Method>	getAnnotationFields(Class<? extends Annotation> annotation)
static AnnotatedType	getCommonSuperType(List<AnnotatedType> types) Finds the most specific common super type of all the given types, merging the original annotations at each level.
static AnnotatedType	getCommonSuperType(List<AnnotatedType> types, AnnotatedType fallback) Finds the most specific common super type of all the given types, merging the original annotations at each level.
static List<Class<?>>	getCommonSuperTypes(List<Class<?>> classes)
static Field	getEnumConstantField(Enum<?> constant)
static String	getFieldNameFromGetter(Method getter)
static String	getFieldNameFromSetter(Method setter)
static AnnotatedType	getFieldType(Field field, AnnotatedType declaringType) Returns the exact annotated type of the field declared by the given type, with type variables resolved (if possible)
static <T> T	getFieldValue(Object source, String fieldName)
static AnnotatedType[]	getParameterTypes(Executable executable, AnnotatedType declaringType) Returns the exact annotated parameter types of the executable declared by the given type, with type variables resolved (if possible)
static List<AnnotatedElement>	getPropertyMembers(Field field)
static <T> Class<T>	getRawType(Type type)
static AnnotatedType	getReturnType(Method method, AnnotatedType declaringType) Returns the exact annotated return type of the method declared by the given type, with type variables resolved (if possible)
static Set<Class<?>>	getSuperTypes(Class<?> clazz)
static boolean	hasAnnotation(AnnotatedElement element, Class<? extends Annotation> annotation)
static <T> T	instance(AnnotatedType type)
static <T> T	instance(Class<T> clazz)
static boolean	isAbstract(AnnotatedType type)
static boolean	isAbstract(Class<?> type)
static boolean	isAssignable(Type superType, Type subType)
static boolean	isGetter(Method getter) Checks whether the given method is a JavaBean property getter
static boolean	isMissingTypeParameters(Type type)
static boolean	isProxy(Class<?> clazz) Attempts to discover if the given class is a dynamically generated proxy class.
static boolean	isSetter(Method setter) Checks whether the given method is a JavaBean property setter
static boolean	isSubPackage(Package pkg, String prefix)
static <T extends AnnotatedType> T	normalize(T type)
static <T extends AnnotatedType> T	removeAnnotations(T type, Set<Class<? extends Annotation>> toRemove)
static String	toString(AnnotatedElement element)
static String	toString(AnnotatedType type)
static <T extends AnnotatedType> T	transformType(T type, UnaryOperator<T> transformer)

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassUtils

public ClassUtils()

Method Detail

getAnnotatedMethods

public static Set<Method> getAnnotatedMethods(Class<?> type,
                                              Class<? extends Annotation> annotation)

Retrieves all public methods on the given class (same as Class.getMethods()) annotated by the given annotation

Parameters:

type - The class to scan

annotation - The annotation to look for

Returns:

All annotated methods

getAnnotatedFields

public static Set<Field> getAnnotatedFields(Class<?> type,
                                            Class<? extends Annotation> annotation)

Retrieves all public fields on the given class (same as Class.getFields()) annotated by the given annotation

Parameters:

type - The class to scan

annotation - The annotation to look for

Returns:

All annotated fields

getReturnType

public static AnnotatedType getReturnType(Method method,
                                          AnnotatedType declaringType)

Returns the exact annotated return type of the method declared by the given type, with type variables resolved (if possible)

Parameters:

method - The method whose return type is to be resolved

declaringType - The declaring annotated type against which to resolve the return type

Returns:

The resolved annotated return type

getFieldType

public static AnnotatedType getFieldType(Field field,
                                         AnnotatedType declaringType)

Returns the exact annotated type of the field declared by the given type, with type variables resolved (if possible)

Parameters:

field - The field whose type is to be resolved

declaringType - The declaring annotated type against which to resolve the field type

Returns:

The resolved annotated field type

getEnumConstantField

public static Field getEnumConstantField(Enum<?> constant)

getParameterTypes

public static AnnotatedType[] getParameterTypes(Executable executable,
                                                AnnotatedType declaringType)

Returns the exact annotated parameter types of the executable declared by the given type, with type variables resolved (if possible)

Parameters:

executable - The executable whose parameter types are to be resolved

declaringType - The declaring annotated type against which to resolve the types of the parameters of the given executable

Returns:

The resolved annotated types of the parameters of the given executable

getRawType

public static <T> Class<T> getRawType(Type type)

isMissingTypeParameters

public static boolean isMissingTypeParameters(Type type)

normalize

public static <T extends AnnotatedType> T normalize(T type)

instance

public static <T> T instance(AnnotatedType type)

instance

public static <T> T instance(Class<T> clazz)

isGetter

public static boolean isGetter(Method getter)

Checks whether the given method is a JavaBean property getter

Parameters:

getter - The method to be checked

Returns:

Boolean indicating whether the method is a getter

See Also:

isSetter(Method)

isSetter

public static boolean isSetter(Method setter)

Checks whether the given method is a JavaBean property setter

Parameters:

setter - The method to be checked

Returns:

Boolean indicating whether the method is a setter

See Also:

isGetter(Method)

getFieldNameFromGetter

public static String getFieldNameFromGetter(Method getter)

getFieldNameFromSetter

public static String getFieldNameFromSetter(Method setter)

getPropertyMembers

public static List<AnnotatedElement> getPropertyMembers(Field field)

findGetter

public static Optional<Method> findGetter(Class<?> type,
                                          String fieldName)

findSetter

public static Optional<Method> findSetter(Class<?> type,
                                          String fieldName,
                                          Class<?> fieldType)

findFieldByGetter

public static Optional<Field> findFieldByGetter(Method getter)

findFieldBySetter

public static Optional<Field> findFieldBySetter(Method setter)

findField

public static Optional<Field> findField(Class<?> type,
                                        String fieldName)

findMethod

public static Optional<Method> findMethod(Class<?> type,
                                          String methodName,
                                          Class<?>... parameterTypes)

getFieldValue

public static <T> T getFieldValue(Object source,
                                  String fieldName)

getAnnotation

public static <T extends Annotation> T getAnnotation(Method method,
                                                     Class<T> annotation)

findImplementations

@Deprecated
public static List<AnnotatedType> findImplementations(AnnotatedType superType,
                                                                  String... packages)

Deprecated. Use ClassFinder directly as that enables caching of the search results

Searches for the implementations/subtypes of the given AnnotatedType. Only the matching classes are loaded.

Parameters:

superType - The type the implementations/subtypes of which are to be searched for

packages - The packages to limit the search to

Returns:

A collection of AnnotatedTypes discovered that implementation/extend superType

findImplementations

@Deprecated
public static List<Class<?>> findImplementations(Class superType,
                                                             String... packages)

Deprecated. Use ClassFinder directly as that enables caching of the search results

Searches for the implementations/subtypes of the given class. Only the matching classes are loaded.

Parameters:

superType - The type the implementations/subtypes of which are to be searched for

packages - The packages to limit the search to

Returns:

A collection of classes discovered that implementation/extend superType

isAbstract

public static boolean isAbstract(AnnotatedType type)

isAbstract

public static boolean isAbstract(Class<?> type)

isAssignable

public static boolean isAssignable(Type superType,
                                   Type subType)

isSubPackage

public static boolean isSubPackage(Package pkg,
                                   String prefix)

toString

public static String toString(AnnotatedType type)

toString

public static String toString(AnnotatedElement element)

hasAnnotation

public static boolean hasAnnotation(AnnotatedElement element,
                                    Class<? extends Annotation> annotation)

getAnnotationFields

public static List<Method> getAnnotationFields(Class<? extends Annotation> annotation)

containsTypeAnnotation

public static boolean containsTypeAnnotation(AnnotatedType type,
                                             Class<? extends Annotation> annotation)

getAllAnnotations

public static Annotation[] getAllAnnotations(Stream<AnnotatedType> types)

addAnnotations

public static <T extends AnnotatedType> T addAnnotations(T type,
                                                         Annotation[] annotations)

removeAnnotations

public static <T extends AnnotatedType> T removeAnnotations(T type,
                                                            Set<Class<? extends Annotation>> toRemove)

eraseBounds

public static AnnotatedType eraseBounds(AnnotatedType type,
                                        AnnotatedType replacement)

Recursively replaces all bounded types found within the structure of the given AnnotatedType with their first bound. I.e.

• All AnnotatedWildcardTypes are replaced with their first lower bound if it exists, or their first upper bound otherwise. All annotations are preserved.
• All AnnotatedTypeVariables are replaced with their first bound. All annotations are preserved.
• Other types are kept as they are.

Parameters:

type - A potentially bounded type

Returns:

The type of the same structure as the given type but with bounds erased, or the unchanged type itself if it contained no bounds

completeGenerics

public static AnnotatedType completeGenerics(AnnotatedType type,
                                             AnnotatedType replacement)

transformType

public static <T extends AnnotatedType> T transformType(T type,
                                                        UnaryOperator<T> transformer)

getCommonSuperType

public static AnnotatedType getCommonSuperType(List<AnnotatedType> types)

Finds the most specific common super type of all the given types, merging the original annotations at each level. If no common ancestors are found (except Object) a TypeMappingException is thrown.

Parameters:

types - Types whose most specific super types is to be found

Returns:

The most specific super type

getCommonSuperType

public static AnnotatedType getCommonSuperType(List<AnnotatedType> types,
                                               AnnotatedType fallback)

Finds the most specific common super type of all the given types, merging the original annotations at each level.

If no common ancestors are found (except Object) returns fallback or throws a TypeMappingException if fallback is null.

Parameters:

types - Types whose most specific super types is to be found

fallback - The type to return as the result when no common ancestors except Object are found (at any level)

Returns:

The most specific super type

getCommonSuperTypes

public static List<Class<?>> getCommonSuperTypes(List<Class<?>> classes)

Parameters:

classes - Types whose most specific super types is to be found

Returns:

The most specific super type

See Also:

getCommonSuperType(List)

getSuperTypes

public static Set<Class<?>> getSuperTypes(Class<?> clazz)

isProxy

public static boolean isProxy(Class<?> clazz)

Attempts to discover if the given class is a dynamically generated proxy class. Standard Java proxies, cglib and Javassist proxies are detected.

Parameters:

clazz - The class to test

Returns:

true if the given class is a known proxy, false otherwise

forName

public static Class<?> forName(String className)
                        throws ClassNotFoundException

Throws:

ClassNotFoundException